Enzymes are lipids.
proteins.
carbohydrates.
nucleic acids.
steroids.
proteins.
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Calcium is very important to the normal functioning of the body, so it is very important that the plasma Ca2+ concentration be well regulated. In which of the following ways does calcium play an important role?
a. calcium plays an important role in the absorption of Vitamin D from the digestive tract. b. calcium is important for maintaining the proper excitability of nerves and muscles. c. calcium stimulates osteoblasts to lay down bone. d. both (a) and (b) above. e. all of these answers.
Arteriolar radius is extrinsically controlled by the hormones vasopressin and angiotensin II, which are potent vasoconstrictors
a. True b. False Indicate whether the statement is true or false
The prefix ________ means "externally."
A) oligo- B) a- C) exo- D) eu-
If there are two forms of atoms for an element that differ only in the number of neutron, the various forms of the element are referred to as ________ of that element.
A. ions B. molecules C. isotopes D. electrolytes