Doctors have had luck transplanting hearts and lungs. But science has not been very successful in growing hearts and lungs. Why? A) They contain nerves and scientists cannot grow nerve cells. B) They are complex organs made of many types of cells and tissues. C) Even if researchers build a heart or lung, there is no guarantee that a person's body will accept it. D) Human hearts and lungs are not like any other animal organs so there is not source for cells and tissues.
Ans. (B). They are complex organs made of many types of cells and tissues.
Organ culture involves development of tissues or organs, in vitro (outside the body), to restore, maintain, or improve damaged organs or tissues. Many organs and tissues are successfully grown by engineered tissues, such as skin and cartilage.
However, heart, lungs, and other complex organs have not been very successfully grown as these organs are made up of different types of tissues and cells. For examples, heart is made up of cardiac muscle tissue, skeletal tissues, and smooth muscle tissue.
It is quite tough to assemble different types of cells and tissues to make organs fully functional or reproducible.
Thus, the correct answer is option (B).
The development of nuclear power had provided electricity for less money,but at a cost. What may be considered a cost of nuclear power?
Help pleaseeeee on 7
What types of features would be visible if the oceans were drained?
The pcr (polymerase chain reaction) protocol that is currently used in laboratories was facilitated by the discovery of a bacterium called thermus aquaticus in a hot spring inside yellowstone national park, wyoming. this organism contains a heat-stable form of dna polymerase known as taq polymerase, which continues to function even after it has been heated to 95 degrees
c. why would such a heat-stable polymerase be beneficial in pcr?
The relationship between a zebra and the lion that eats it is an example of what kind of interaction? question 10 options:
a.competition
b.mutualism
c.consumer–resource
d.commensalism
e.none of the above
Which shotgun choke is best for hunting a large, slow bird, such as a t?
Are pterosaurs more closely related to turtles or to crocodilians? Explain your answer.
Since a pterosaur species has now been found with feathers, they have to have some connection with dinosaurs, which have connections with crocodillians. Therefore pterosaurs are more related to crocodillians than turtles.
What are the differences between the pubertal growth of girls and boys? select all that apply?
Final answer:
The main differences between the pubertal growth of girls and boys include the onset of puberty, the growth spurt, and distinct features such as menstruation in girls. Girls start puberty and their growth spurt earlier, and by adulthood, they are generally shorter than males.
Explanation:
Differences Between the Pubertal Growth of Girls and Boys
Puberty marks significant growth and development during adolescence with notable differences between girls and boys. In girls, puberty typically begins between the ages of 9 and 10 with the development of breasts and pubic hair. Girls experience a menstruation cycle, with the first menstrual period being called menarche. Boys generally begin puberty between the ages of 11 and 12, with developments like the growth of external genitals, facial hair, and a deepening voice.
The growth spurt timing also differs; girls start their growth spurt earlier than boys, which leads to an earlier peak growth rate but a lower one compared to boys. By adulthood, these differences in timing and rate contribute to why females are about 10 centimeters shorter than males on average.
Menstruation and Growth Patterns
Menstruation is a regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. Adolescent growth spurt (AGS) is marked by these distinct puberty changes in both sexes but leads to sexual dimorphism in adult size, body composition, and overall shape.
Triglycerides contain more metabolic energy per unit weight than glycogen because:
Answer:
Triglycerides contain more metabolic energy per unit weight than glycogen because it is water-insoluble. Triglycerides (fats and oils) are important dietary sources of energy and they can be stored in larger quantities than carbohydrates. Fat also functions as a major form of energy storage (9 Cal/g).
Carbohydrate reserves are depleted after about 1 day without food, but stored fat can provide needed calories for 30-40 days
Explanation:
Carbohydrates from dietary sources and glycogen catabolism are used preferentially for energy production by some tissues, such as the brain and active skeletal muscles.
Body stores of glycogen are depleted after only a
few hours of fasting, which requires fatty acids
stored in triglycerides to be used as energy sources.
Even if glycogen supplies are adequate, resting muscle and liver cells use energy from triglycerides because this conserves glycogen stores and glucose for use by brain cells and red blood cells.
EXAM TOMORROW! PLEASE HELP! The genotype of F1 individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these four genes, what are the probabilities that F2 offspring would have the following genotypes? Show your work.
(1)aabbccdd
(2) AaBbCcDd
(3) AABBCCDD
(4) AaBBccDd,
You can use the Punnett square or the shortcut method. Either way, it is given that in any circumstance that the probability of a heterozygote (Aa) is 2/4 or simply 1/2 and the probability of a homozygote (AA) or (aa) is ¼.
a. aabbccdd = (¼)(¼)(¼)(¼) =1/256
b. AaBbCcDd = (1/2) (1/2) (1/2) (1/2) = 1/16
c. AABBCCDD = (¼)(¼)(¼)(¼) = 1/256
d. AaBBccDd =(1/2)(¼)(¼)(1/2) = 1/64
What evidence is most important when using relative dating? a the position of fossils in sedimentary rock layers b the types of minerals in a petrified fossil c the position of sediment in petrified rock d the half-life of a radioactive element?
how did collision during the formation of the planets affect earth mercury venus and uranus
Collisions during the formation of the planets played a crucial role in shaping their sizes, compositions, and physical characteristics.
What are the collisions during formation of the planets?The collisions during the formation of the planets, including Earth, Mercury, Venus, and Uranus, had several significant effects on their development:
1. Accretion: Collisions between smaller celestial bodies led to the accretion of these objects, forming larger bodies that eventually became the planets we know today.
2. Planetary differentiation: The energy from these collisions caused the temperature of the growing planets to rise, allowing for the process of planetary differentiation to occur. This process separates the planet's material into layers based on density, resulting in the formation of a core, mantle, and crust.
3. Formation of the Moon: Earth's collision with a Mars-sized body, known as Theia, resulted in the creation of debris that eventually coalesced to form the Moon.
4. Tilted axis: The collisions impacted the rotational axes of the planets, causing them to tilt. Uranus, for example, has a unique tilt with its axis nearly parallel to its orbital plane.
5. Atmospheric development: Collisions with other celestial bodies helped deliver volatile elements such as water, nitrogen, and carbon dioxide to the planets, contributing to the development of their atmospheres.
Learn more about Planet formation here:
https://brainly.com/question/29413773
#SPJ3
A series of events occurring in the mitochondria leads to the synthesis of which energy molecule
The inner mitochondrial membrane transduces energy through oxidative phosphorylation or the electron transport chain, which is responsible for the production of energy in the form of ATP or adenosine triphosphate molecule.
The electron transport chain is the conversion of oxygen to water. It comprises an enzymatic series of electron donor and acceptors where each electron donor passes an electron to an acceptor and in turn, donates these electrons to another acceptor, a process that continues down the series. After this, cellular respiration occurs, a biochemical pathway by which the cells releases energy for the essential processes of life.
A group of researchers is collecting data on the foraging patterns of a population of wagtail birds, which feed on an insect called the dung fly. These graphs show some of the data collected by the team:
Given the data presented in each of the graphs, what conclusion can you draw from this data about the feeding practices of the wagtail birds?
The more root hairs a plant has, the more water and nutrients it can absorb.which is an appropriate justification of this statement
Explanation:
The more surface area, the larger amount of soil it has direct access to and the more it can absorb from said soil. This also help a plant identify areas more beneficial to the plant via richer nutrients and more water and it can then grow in that direction
Brainlist please.
Arctic foxes have blue-gray fur in summer and change to white fur in winter. what would be one way to test whether this change is influenced by cooling seasonal temperatures?
how can knowledge of the human genome be useful for in vitro fertilization techniques
The _____ works with the Environmental Protection Agency to enforce marine biology regulations along the coast and in the Great Lakes channels.
A. Coast Guard
B. Department of Interior (DOI)
C. Center for Disease Control (CDC)
D. Food and Drug Administration (FDA)
I think it is A.
The Coast Guard works with the Environmental Protection Agency to enforce marine biology regulations along the coast and in the Great Lakes channels.
Answer: Option A
Explanation:
The Environmental Protection Agency (EPA) takes initiative to instill certain regulations to maintain the Ocean and its resources with the help of coastal guards and NGO’s. The Ocean coast is polluted due to various avoidable and unavoidable pollutants like oil leakage, industries letting in their waste, ship wrecks etc.
President Richard Nixon was the one who created this EPA. The EPA takes utmost care by educating the people of the necessity to maintain the coast in a disciplined attitude so as to have a pollution free oceanic coast which would in turn not adhere into the relevant working stream. Avoiding litter is the main rule that has been imposed.
Answer:
The correct answer is option A. "Coast Guard".
Explanation:
The United States Coast Guard (USCG) is a branch of the United States Armed Forces dedicated to coastal defense. Marine environmental protection is one of the duties that USCG performs along the coast and in the Great Lakes channels. In order to have the best results in this duty, USCG works with the Environmental Protection Agency and assures environmental protection under five different areas: prevention, enforcement, surveillance, response and in-house abatement.
This infectious disease is transmitted by a virus. Symptoms may vary, from a stuffy nose to coughing and a fever. This disease basically attacks the mucous membranes of the nose and throat but can attack the entire respiratory system. This infectious disease is
The right answer is D. the common cold.
The cold is caused by a virus. It is a frequent infection of the nose and throat also called viral or acute rhinitis.
The cold is responsible for sneezing, nasal congestion (feeling of a stuffy nose), a runny nose that requires a nose and often a sore throat.
Its symptoms appear gradually and persist for 5 to 7 days, rarely more.
"the term normally applied when two genes fail to assort independently is ________."
2. The human body has natural steroids, a type of lipid. What is the function of steroids in the human body?
They store extra energy in the body.
They build cell membranes.
They carry chemical messages throughout the body.
They prevent water loss from the body.,
Earth is tilted 23.5° on its rotational axis. This tilt affects the amount of direct sunlight received by Earth’s hemispheres throughout the year. During summer in the Northern Hemisphere, which of the following descriptions correctly identifies the amount of sunlight received in the Arctic (the northernmost part of Earth)?
d. Due to the Earth's 23.5° tilt on its axis, the Arctic Circle experiences 24 hours of daylight during summer in the Northern Hemisphere. Therefore, the correct answer is 'constant sunlight'.
The correct answer is constant sunlight. Due to the tilt of the Earth's axis during the Northern Hemisphere's summer, the North Pole is tilted towards the Sun. This results in the Arctic Circle experiencing 24 hours of daylight, known as the 'polar day,' during the summer solstice around June 21. This phenomenon is because the Arctic Circle falls within the area that remains in continuous sunlight during this time, making option d, constant sunlight, the correct one.
The complete question is : earth is tilted 23.5° on its rotational axis. this tilt affects the amount of direct sunlight received by earth’s hemispheres throughout the year. during summer in the northern hemisphere, which of the following descriptions correctly identifies the amount of sunlight received in the arctic (the northernmost part of earth)? a. no sunlight b. 12 hours of sunlight per day c. sunlight at a 0-degree angle of incidence d. constant sunlight
An ultrasound procedure that evaluates blood flow in an effort to determine the cause of a localized reduction in blood flow is
What dosage schedule is represented by the graph below? Drug dosage schedule A. One pill every hour. B. One pill every 3 hours. C. One pill every 5 hours. D. One pill every 7 hours. A patient takes the recommended dosage of painkiller pills, but does not feel any immediate effect. What should the patient do next? A. Continue to take pills until the pain goes away. B. Try a different brand of painkillers right away. C. Assume the bottle of pills is defective and take a pill from a different bottle. D. Wait for a while. The graph below shows the effect of taking a single dose of pill type "E." The maximum tolerance level for this drug is 7 mcg/cc and the minimum effective level is 2 mcg/cc. What is the best dosage schedule for this drug? Pill E drug level graph A. Take one pill every 2 hours. B. Take one pill every 4 hours. C. Take one pill every 6 hours. D. Take one pill every 12 hours. The graph below shows drug levels in the blood and in a target organ through time, while taking Pill Type C in the Gizmo. The dosage schedule is one pill every two hours. What will eventually happen if the patient continues to take the pill on the same dosage schedule? Drug level in blood and target organ A. The drug level in the target organ will continue to increase steadily until an overdose occurs. B. The drug level in the target organ will level off and reach equilibrium. C. After reaching a peak of 200 mcg/cc, the levels of drug in the target organ will decrease steadily back to 0 mcg/cc. D. The drug level in the target organ will fluctuate randomly. Suppose that a batch of controlled-release pills intended to be taken every 12 hours were accidentally manufactured without their thick coating. What would be most likely to happen to someone who took one of these pills? A. The medication would be absorbed too quickly. This could cause an overdose. B. The medication would be absorbed too slowly. This could cause the patient not to feel the drug's effects. C. The medication would still be absorbed as intended. D. The drug level in the blood would fluctuate wildly.\
Understanding a drug's dosage schedule can help to ensure its effectiveness and prevent overdosage. Altering a drug's form, such as removing a pill's coating, can drastically alter how it's absorbed and could lead to an overdose. If a drug isn't immediately effective, patience should be exercised as the medication might take some time to take effect in the body.
Explanation:It seems like these questions are part of a test about interpreting data from drug dosage schedules and understanding the effect of altering these schedules. The answers would greatly depend on the unseen graphs, but general principles can still be discussed.
One should adhere to the recommended dosage schedule to ensure effectiveness and safety. If a painkiller isn't working immediately, it may take some time for the medication to take effect in the body; patience is necessary (option D).
Understanding the target graph for drug E might lead to a conclusion that the best option is every 4, 6 or 12 hours depending on when the drug concentration falls to the minimum effective level and rises to the maximum tolerance level.
Continuing to take pill type C every two hours might lead to overdose if the levels don't stabilize or decrease after reaching a peak, before taking the next dose.
A controlled-release pill without its coating would release the medicine too quickly which could cause an overdose (option A).
Learn more about Pharmacology here:https://brainly.com/question/30308277
#SPJ12
The graph gives information on greenhouse gas (ghg) emissions from US industries. Which year had the lowest ghg emissions from industrial activity?
Answer:
The correct answer is 2009
The green house gas emission decreased in year 2009 as a result of recession of industries. Green house gas emission declined in the year 2008-2009 because of the industrial and transportation sector.
According to the report of Environmental Protection Agency the average percentage of greenhouse gas emission in UnitedStates lowered by 6%.
Answer: E
Explanation:
The client who is pregnant for the first time asks the nurse about the changes in her body. while describing the changes in each body system, the nurse mentions that the system that undergoes the most profound change of all during pregnancy is the what
A patient with metastatic lung cancer is suspected to have malnutrition. the nurse reviews the results of the serum albumin and serum prealbumin laboratory studies. how should the nurse interpret the findings?
Fast glycolytic muscle fibers __________. fast glycolytic muscle fibers __________. have fewer,smaller myofilaments generate lots of power and depend on anaerobic pathways to make adenosine triphosphate (atp) are prevalent in postural muscles of the back are abundant in muscles of the lower limbs, contract quickly, and are oxygen-dependent have abundant myoglobin and numerous mitochondria
Answer:
Generate lots of power and depend on anaerobic pathways to make adenosine triphosphate (ATP)
Explanation:
Fast glycolytic muscle fibers generate lots of power mainly through anaerobic glycolysis. They are thick muscle fibers that can produce bursts of energy for a short span of time, but they fatigue easily. Looking at it more closely, you will find that they do not have many mitochondria because they don't rely on aerobic pathways and they are sometimes described as white fibers because they have limited blood supply.
These types of muscles fibers are called fast twitch fibers because they can generate more force at a faster rate and allow quick movements. But then again, only for a short period before they start to fatigue.
Ghrelin is secreted primarily by the stomach cells and promotes eating and weight gain.
a. True
b. False
The answer is true. Ghrelin is produced by ghrelinergic cells of the stomach. When the stomach is empty, the neuropeptide is absorbed into the blood and induces a response from the hypothalamus. The hypothalamus increases the feeling of hunger, appetite, and gastric secretion.