The abducens nerves
A. are involved in eye movement.
B. dilate blood vessels in the skin.
C. control size of the pupil.
D. transmit pain impulses from the teeth.
E. slow the heart rate.
Answer: A
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When a muscle fiber is subjected to a stimulus, it contracts completely. This is called:
a. threshold stimulus b. the all-or-none-law c. twitch contraction d. tetanic contraction
The two major control systems of the body are the ____________________ and the ____________________
Fill in the blank(s) with correct word
Cations and anions that dissociate in water are sometimes called
A. nonelectrolytes and solutes. B. electrolytes, because they can conduct an electrical current. C. molecules. D. nonelectrolytes, because they do not conduct an electrical current. E. molecules and electrolytes.
Why do asthma sufferers often use inhalers that contain sympathomimetics to ease their symptoms?
A. The drugs are agonists that stimulate adrenergic receptors in the bronchial tubes. B. Sympathomimetics enhance the release of acetylcholine from preganglionic and postganglionic neurons. C. The sympathomimetics bind to muscarinic receptors and block them. D. The drugs are antagonists that bind to adrenergic receptors in the bronchial tubes without stimulating them. E. Sympathomimetics suppress release of norepinephrine and epinephrine.