The nervous system helps the body maintain homeostasis by

Which of the following is where blood cells are made

While hiking on Mt. Rainier, Deepak found that he had to take deeper breaths as he climbed higher. Which reason explains why deeper breaths were needed?

The central nervous system consists of our

After dislocating his left elbow, Mr. Harvey had to do which of the following before he could move his elbow like normal?

One function of the human endoskeleton is to

The body cells of most multicellular animals are not in direct contact with the external environment. These cells are supplied with material from the environment by

In humans, gas exchange and gas transport occur as a result of the functioning of a system of

In humans, carbon dioxide that is excreted passes from the blood directly into the

In humans, which of the following is produced within certain bones

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