How do most steroids differ from one another?
a) they differ in the functional groups attached to their backbone structure
b) all the steroids are linear; however, some have ring-structured functional groups
c) they differ in their basic backbone structure
d) they differ in their solubility
Ans: a) they differ in the functional groups attached to their backbone structure
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The stretch receptors for the Hering-Breuer reflex are located in the
a. diaphragm. b. elastic tissue of the lungs. c. medulla. d. smooth muscle of the airways. e. trachea.
Which structures in the trachea prevent its collapse or overexpansion as pressures change in the respiratory system?
a. C-shaped tracheal cartilages b. S-shaped tracheal bones c. O-ringed tracheal cartilages d. irregular circular bones
Maureen is hiking in the cold, and to maintain homeostasis her body begins to
A. vasodilate vessels in her head and neck. B. increase heat loss from the skin. C. reduce her blood pressure. D. release chemicals to initiate a high fever. E. shiver.
A resting membrane potential of -70 mV indicates that the _____.
Fill in the blank(s) with the appropriate word(s).