1. The internal environment for the body's cells
a. is in direct contact with the body's cells. b. consists of the extracellular fluid. c. rr3, be maintained at absolutely unchanging composition, temperature, and volume for survival of the body. d. is in direct contact with the body's cells and consists of the extracellular fluid.
Which two body systems function by extrinsic controls?
a. nervous and respiratory b. nervous and endocrine c. endocrine and respiratory d. endocrine and lymphatic
3. Which of the following statements regarding endocrine glands is true?
a. They consist of ducts. b. They secrete hormones internally into the blood. c. They are derived from connective tissue. d. They include the salivary glands.
4. Which of the following factors of the internal environment is not homeostatically maintained?
a. its concentration of nutrient molecules b. its concentration of nitrogen gas, of which 80% of atmospheric air is composed c. its concentration of oxygen and carbon dioxide d. its pH
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