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LUCKY_DIMON [66]
2 years ago
3

The action potential is caused by permeability changes in the plasma membrane.

Biology
1 answer:
Romashka [77]2 years ago
7 0

Answer:

True

Explanation:

During resting potential, the inside of the membrane is more negative compared to the outside. The activation gates of Na+ channels are closed and the membrane is impermeable for sodium ions. When a stimulus is strong enough to fire an action potential, change in the shape of the channel proteins opens the activation gates.  

Now, the gated Na+ channels are opened making the membrane more permeable for sodium ions.  The membrane is permeable for sodium ions for a brief period only when both activation and inactivation gates are open. This allows the entry of sodium ions inside the axon and makes is more positive.

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Biotite mica and muscovite mica have different chemical compositions. Compared to the magma from which biotite mica forms, the magma from which muscovite<span>mica forms is usually more felsic and less dense. </span>
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The electric resistance pyrometer operates under the principle that an increase in temperature will cause an increase in the res
tatyana61 [14]

Answer:

operates om the principle of temperature-induced resistance.

Explanation:

In physical quantities, the resistance of an electrical conductor can be correlated directly with the temperature of the material. The property for the change in the resistance with temperature is called the temperature coefficient of resistance. Mathematically, the resistance of a material is given as follows:

R = R_{ref} [ 1 + \alpha (T - T_{ref})]

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Treff = reference temperature of the material.

From the equation, it can be seen that a positive coefficient for a material means an increase in the resistance of the material.

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2 years ago
Which food molecule (monosaccharide, polysaccharide, lipid, or protein) would you eat if...
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<span>You needed a quick boost of energy - MONOSACCHARIDE

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2 years ago
Which of the following is most consistent with homeostasis? Select one: a. As blood pressure falls, blood flow to cardiac (heart
alex41 [277]

Answer:

Both C and E are reasonable answers.

Explanation:

Homeostasis describes the body's ability to maintain a stable equilibirum. In other words, if the body experiences a stress, it will generate a response that works to counteract that stress and restore itself to how it was prior to the stress.

A. This describes a cause and effect (BP down --> venous return down). It does not describe an active physiological response to counteract the BP drop such as an increase in heart rate. Not homeostasis.

B. Again, a cause and effect is described. Blood vessel walls becoming thinner is not a response to counteract increased BP. Not homeostasis.

C. Here a response to a stress is described. Men are drinking more water. The body responds by getting rid of that water, restoring the body to its former state. This describes homeostasis.

D. This sounds like homeostasis, but it's actually the opposite of what happens. Dilation of peripheral blood vessels is a way for the body to get rid of heat. This is the opposite of what you would want if the body got colder - it would make the stress worse, which is the opposite of homeostasis. In actuality the response to cold temperature is constriction of blood vessels to preserve heat.

E. This deescribes homeostasis. The stress is increased glucose. The body's response to manage it is to release insulin, which helps remove the glucose from circulation.

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2 years ago
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