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3 years ago

What initially causes a nerve impulse

2 answers:

7 0

Nerve impulses are caused by Potassium (K+) and Sodium (Na+) ions that are located inside and outside of the cell. The structure of the cell membrane is permeable to Potassium but are highly impermeable to Sodium ions. These impulses are transmitted from one nerve cell to the other in very fast series.

denis-greek [22]3 years ago

7 0

Answer is B) The movement of chemicals into the dendrites of the neuron causes a nerve impulse.

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Atoms of carbon, oxygen, and hydrogen are found in all biological macromolecules. Which macromolecules are made ONLY of these th

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3 years ago

Steroid hormones and thyroid hormones ________ pass across the plasma membrane; they cause the target cells to ________ that pro

tekilochka [14]

Answer:

can ,synthesize specific proteins

Explanation:

Hormones are chemical signals secreted by animals and plant that are capable of regulating body activities and maintain homeostasis.

They are transported in the circulatory system of the body

The action of hormones can be seen after the hormone has bound to its specific receptor found inside the cell.

For instance, steroid hormone and the thyroid hormones can pass through the plasma membrane to their receptors inside the cells.

When they bind with their receptors, the target cells will synthesize specific proteins that produce the characteristic effect of the hormone.

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3 years ago

List 10 occupations that involve DNA

Bond [772]

Answer:

Some jobs that involve DNA are,

Criminal Lawyers

Police Officers

Detectives

Judges

Scientist

Doctors

Nurses

Cancer Reasearchers

Anthropologists

Archeologists

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3 years ago

Which organelles is made of microtubules that functions during cell division?

dezoksy [38]

I think it's centrioles

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3 years ago

Describe what happens to an ecosystem when a keystone species is removed.

enot [183]

Answer:

The ecosystem would be forced to radically change, allowing new and possibly invasive species to populate the habitat.

Explanation:

A keystone species is an organism that helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether.

I HoPe ThIs HeLpS!!!!!

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3 years ago