An action potential is caused by an influx of these ions into the cell ________.

In order to excite a muscle cell, acetycholine must ________.

An action potential is caused by an influx of these ions into the cell ________.

The elbow is classified as a(n) ________.

The bone cells that respond to parathyroid hormone (PTH) to destroy bone matrix and release calcium into the blood are called ________.

Which ion diffuses into the axon terminal when a nerve stimulus reaches it?

Which one of the following is composed of myosin protein?

The phospholipid tails are ________, which make the plasma membrane impermeable to water.

Which is not one of the four most common elements found in the human body?

A nucleotide of DNA contain three components: ________, ________, and ________.