The actin and myosin filaments in a muscle contract with enough force to produce a contraction. They don't hold each other still while pulling inward.
Myosin heads on myosin filaments interact with actin filaments during muscle contraction.
Actin filaments are pulled inward by the myosin heads, which are then released and reattached farther down the filament in a cycle. The sliding filament mechanism is the name given to this phenomenon.
Myosin heads join actin filaments in cross-bridges as a result of ATP hydrolysis.
Thus, The actin and myosin filaments in a muscle contract with enough force to produce a contraction. They don't hold each other still while pulling inward.
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A woman age 49 years has sought care from her primary care provider because of "intimacy problems." upon questioning, the woman reveals that she is experiencing sexual desire, but that intercourse causes her significant pain. in the absence of sexual activity, the woman states that she does not have any significant vaginal discomfort. what would the clinician recognize that this client is most likely experiencing? dyspareunia vulvodynia vaginismus a sexually transmitted infection (sti)
A journal whose articles are critically reviewed by experts in the field is called a:
A journal whose articles are critically reviewed by experts in the field is called a: peer reviewed journal.
Peer reviewed journals also known as scholarly journals, are journals that contain articles written by experts and are critically reviewed by many other experts in the field before the publication of the journal in order to ensure that the article is of good quality. When reviewing the journals, the reviewers do not know the article’s author, so that the article fails or succeeds based on its own value and not the owner’s reputation.
What phrase BEST describes a community?
A. the different types of predators in an area
B. the various species of plants in an area
C. all populations of organisms living in an area,
Answer: The correct answer is -
C. all populations of organisms living in an area.
Explanation:
Community can be described as interacting group of populations belonging to different species, inhabiting any particular location.
For instance, a forest of trees and growing plants, which is also inhabited by different animals and microbial population forms biological community of that area.
Which structure provides a protective outer covering for bones and assists with fracture repair?
A minimum of 100 years of isolation is required for two populations to accumulate enough differences to be considered different species. true or false: a minimum of 100 years of isolation is required for two populations to accumulate enough differences to be considered different species.
a. True
b. False
Insertion of a narrow flexible tube, or catheter, through a blood vessel into the heart to withdraw blood samples, measure pressures, and inject contrast medium for imaging purposes is ________. (2 words)
Bacitracin blocks the transport of nag and nam across the cytoplasmic membrane to the cell wall. like other antimicrobials that block cell wall synthesis, this would result in weak cell walls and __________.
Bacitracin is an antibiotic that inhibits bacterial cell wall synthesis, causing the cell wall to weaken and eventually leading to cell lysis or the bursting of the cell due to osmotic pressure. This means that the bacitracin is particularly effective against certain types of bacteria, while not harming human cells. It is commonly used in topical ointments due to potential kidney damage from prolonged use.
Explanation:Bacitracin is a peptide antibiotic that inhibits bacterial cell wall synthesis by blocking the movement of peptidoglycan precursors, N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM), across the cell membrane. The cell wall becomes weak due to insufficient peptidoglycan, a major component of the cell wall in bacteria. This results in cell lysis, where the cell bursts due to osmotic pressure because the cell wall can't hold the cell contents.
Bacitracin, like other cell wall synthesis inhibitors such as B-lactams and glycopeptides, exhibits selective toxicity as it targets a feature not present in human cells - peptidoglycan in the cell wall. Antibacterials like bacitracin are effective and popular because they do not harm human cells at the same time as they kill bacterial cells, which makes them particularly potent against Gram-positive bacteria like Staphylococcus and Streptococcus commonly found on the skin. However, it's important to note that prolonged use of bacitracin can lead to kidney damage, so it is often used in combination with other antibiotics like neomycin and polymyxin in topical ointments such as Neosporin.
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Continuous cell lines differ from primary cell lines in that question 12 options:
a.viruses can be grown in continuous cell lines.
b.continuous cell lines can be maintained through an indefinite number of generations.
c.continuous cell lines always have to be reisolated from animal tissues.
d.continuous cell lines are derived from primary cell lines.
e.continuous cell lines are from human embryos.
Continuous cell lines can be propagated indefinitely, while primary cell lines have a limited lifespan.
Option (b) is correct.
Continuous cell lines differ from primary cell lines in that they can be maintained and propagated through an indefinite number of generations, whereas primary cell lines have a limited lifespan and eventually undergo senescence or cell death.
Continuous cell lines are derived from primary cell lines through a process called immortalization, where they acquire the ability to divide indefinitely. These cell lines are often used in research laboratories and biotechnology applications because of their ability to provide a continuous and consistent source of cells.
Unlike primary cell lines, continuous cell lines do not need to be reisolated from animal tissues repeatedly. They can be cultured in the laboratory under specific conditions, and they are widely used for studying cell biology, drug testing, vaccine development, and viral propagation, among other applications.
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______________ is the tendency of new parts of the brain to take up the functions of the injured parts.
Moss spores form inside capsules that break open and shoot spores into the environment. Which does not help carry these spores to new areas? water
rhizoids
animals
wind
What is the term given to the genetic makeup of the organism?
The loss of a fetus before the 20th week of pregnancy is referred to as a(n) ___________. The medical term is spontaneous abortion, but the condition is not an abortion in the common definition of the term. A) toxemia. B) miscarriage. C) ectopic pregnancy. D) embryonic pregnancy.
the answer is mscarriage, b.
The ________ is the area of the brain where higher level thinking and self-regulation occur.
The term "hearing impaired" is preferred by most deaf adults. true false
Identify the two main regions of a typical mollusk's body
"what advantage do organisms that reproduce sexually have over organisms that reproduce asexually?"
which of the following separates layers of different density?
A)Incline
B)Halocline
C)Thermocline
D)pycnocline
Answer:pycnocline
Explanation:
I just had a question that was the opposite, instead of asking density and the answer is pycnocline, mine was asking pycnocline and the answer was density
During which trimester is the developing embryo susceptible to damage that could lead to birth defects due to the fact that there is such a rapid amount of change taking place in the embryo?
Answer:
A. first trimester
Explanation:
this is the riskiest weeks because of the fact that you dont know if it is going to survive
Name one negative consequence of exponential human population growth.
greater biodiversity
increased pollution
longer life expectancy
Answer:
The correct answer is "B" increased pollution
Explanation:
got it on USAtestprep ;D
What is the species name of a frog that is between 1.5 and 6 inches long, has warts on its skin, and has a triangular mark between its eyes? question 3 options: bufo boreas litoria caerulea pseudacris crucifer acris crepitans?
What is the species name of a frog that is between 1.5 and 6 inches long, has warts on its skin, and has a triangular mark between its eyes?
A.
Bufo boreas
B.
Acris crepitans
C.
Litoria caerulea
D.
Pseudacris crucifer
-->Acris Crepitans is the correct answer.
One of the characteristics of a nutritious diet is that the foods provide enough of each essential nutrient, fiber and energy. this principle of diet planning is called:
Circulatory systems compensate for _____. circulatory systems compensate for _____. the problem of communication systems involving only the nervous system the need to cushion animals from trauma temperature differences between the lungs and the active tissue the slow rate at which diffusion occurs over large distances
The circulatory system compensates for the slow rate at which diffusion occurs over large distances, facilitating efficient transport of materials within the body. Additionally, it also compensates for the limitations of having only the nervous system for communication by disseminating signals broadly to the body via hormones and other messengers.
Explanation:The circulatory system compensates for the slow rate at which diffusion occurs over large distances, amongst other functions. Within the body, materials like oxygen, nutrients, and waste products need to be transported from one region to another. Relying on simple diffusion would be quite inefficient due to the slow rate at which it processes. Therefore, the circulatory system acts as a network of highways, speeding up the transport process significantly.
Furthermore, it's critical to understand that the circulatory system also compensates for the problem of communication systems involving only the nervous system. While the nervous system is crucial for fast and targeted responses, the circulatory system disseminates hormones and other signals broadly to the entire body. It’s a slower communication method, but it affects all parts of the body simultaneously, which can be beneficial for many types of responses.
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The hormone epinephrine binds to β adrenergic receptors on smooth muscle cells of the bronchioles, causing them to dilate (increase in diameter). thyroid hormone is essential for the synthesis of β adrenergic receptors; therefore, in the absence of thyroid hormone, epinephrine cannot trigger bronchodilation. this concept is known as __________.
How does using killed or weakened bacteria in an immunization help the body prevent infections?
A.) Antibodies are formed that fight those types of bacteria.
B.) The body develops a fever that kills beneficial bacteria.
C.) Bacterial reproductive cycles are disrupted.
D.) Bacteria-fighting viruses are activated.,
Answer:
A. antibodies
Explanation:
Yesterday nadia consumed 250 grams of carbohydrate, 75 grams of protein, and 60 grams of fat. 57) what percentage of calories of her day's intake came from fat?
The flow of surface run-off can be controlled by building retaining walls called _____.
The flow of surface run-off can be controlled by building retaining walls called levees, which are key components of flood control systems. In addition to levees, reservoirs collect and store water for various uses, and conservation efforts are important for sustainable water management. Aqueducts and desalination are other methods used to meet freshwater demands.
Explanation:The flow of surface run-off can be controlled by building retaining walls called levees. The purpose of a levee is to prevent the overflow of rivers, lakes, or oceans from flooding adjacent land. Levees are often part of a larger flood control system, which may include dams and reservoirs. By building a levee, water is contained within the riverbanks, and the risk of flooding to surrounding areas is reduced.
Another method of controlling water flow is through the use of sandbags, which can be placed around potential breaches or leaks in levees or embankments as a temporary measure. According to Environmental Biology 207, sandbags can balance a massive body of water by creating a barrier that stops further flow. Reservoirs also play an essential role by collecting water and storing it for use during drier periods, providing benefits such as water supply, hydroelectric power, flood control, and recreation.
Conservation and Sustainable Management of Water
Conservation is crucial for sustainable water management, involving measures like high-efficiency appliances and behavioral changes to reduce water consumption. In areas where water is scarce, desalination can provide fresh water by removing salt from seawater, although this process is expensive and energy-intensive. Aqueducts transfer water from regions where it is abundant to those where it is needed, but they can lead to controversial political issues and environmental impacts on the source regions.
Excess of which vitamin can cause toxic effects of excess perspiration and fishy body odor
If you looked at unknown cells under a microscope, what could lead you to correctly conclude that they are prokaryotic cells
Structural unemployment can be caused by ____________.
Which of the following events encouraged Somali fishers to become modern-day pirates?
A. The Somali government's inability to protect its resources
B. Attack
s by international pirates on Somali fishers
C. The illegal entry of cargo ships into Somali waters
D. Legal fishing in Somali waters by international fishers
Answer:
A.
Explanation:
Legal fishing in Somali waters by international fishers encouraged Somali fishers to become modern-day pirates. Therefore, option (D) is correct.
Who were Somali fishers?Somali fishers are individuals who work in the fishing industry in Somalia, a country located in the Horn of Africa. Due to a lack of effective government control and the effects of overfishing by foreign fleets, Somali fishers have faced significant challenges in recent years. The depletion of fish stocks in Somali waters has made it difficult for local fishers to make a living, leading some to turn to piracy as a means of survival.
In addition, the activities of international ships, including illegal fishing and dumping of toxic waste, have further damaged the environment and the livelihoods of local fishers. The issue of Somali piracy has become a complex problem involving economic, environmental, and political factors.
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