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maria [59]
3 years ago
15

3. What 3 ions play a crucial role in muscle contraction? (3 pts)

Biology
1 answer:
Alenkinab [10]3 years ago
6 0

Answer:

(1) Calcium binds to troponin C, causing the conformational shift in tropomyosin that reveals myosin-binding sites on actin. (2) ATP then binds to myosin. (3) ATP is then hydrolyzed.

Explanation:

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Which of these conditions indicate positive feedback has occurred?
aleksklad [387]

Answer;

A) Blood pressure decreases greatly; blood flow to the heart is inadequate, and blood pressure decreases.

Explanation;

-With negative feedback, the output reduces the original effect of the stimulus. While in a positive feedback system, the output enhances the original stimulus.

-Negative feedback is the most commonly used feedback loop in the body. Negative feedback is used to negate or counteract a stimulus without completely eradicating it.

-One key difference between the two feedback is that positive feedback loops are used to eradicate a stimulus. Another key difference is that responses through positive feedback become more amplified over time. So once a stimulus activates a positive feedback loop it is not turned off until the stimulus is completely removed.

8 0
3 years ago
Why is promoter important to transcription
andrew11 [14]

Answer:

A promoter is a region of DNA where transcription of a gene is initiated. Promoters are a vital component of expression vectors because they control the binding of RNA polymerase to DNA. RNA polymerase transcribes DNA to mRNA which is ultimately translated into a functional protein.

Explanation:

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3 years ago
The __________ lobes make up one-third of the area of the cerebral cortex
ddd [48]
The frontal lobe takes about 1/3 of the cerebral cortex. 
8 0
3 years ago
Atelectasis is caused by occupational exposure to coal dust.<br> a. true<br> b. false
Irina18 [472]
The statement is true. Atelectasis is the collapse or closure of a lung resulting in reduced or absent gas exchange. It may effect part or all of a lung. An airway blockage also can cause Atelectasis. A blockage may be due to a foreign object, a mucus plug, lung cancer, or a poorly placed breathing tube from a ventilator. When a blockage occurs, the air that's already in the air sacs is absorbed into the bloodstream. 
6 0
3 years ago
In a community a species of birds has some individuals with a different size and others which statement correctly explains how p
krok68 [10]

Physical differences in beaks of birds would develop as a result of different environmental changes.

<h3>What is Evolution?</h3>

This is described as the process in which heritable characteristics are changed in species over successive generations. This occurs as a result of natural selection in which the traits suitable for survival are passed to the offspring.

This is usually as a result of a change in the environmental factors which ensures that the organisms are able to adapt so as not to die out and go extinct in this type of scenario.

Read more about Evolution here brainly.com/question/12271572

#SPJ1

3 0
2 years ago
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