What is the term for muscles that have opposite actions?
A. Synergists
B. Antagonists
C. Fixators
D. Prime movers
Answer: B
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Competition for receptors is strictly a pharmacological phenomenon, since naturally occurring chemical messengers do not compete with each other for the same receptor site.
Answer the following statement true (T) or false (F)
What category of receptor cell is used to sense touch, vibration and pressure?
a) photoreceptor b) mechanoreceptor c) thermoreceptor d) chemoreceptor e) osmoreceptor
Drugs that do this would decrease sympathetic function:
a. irreversibly inhibits acetylcholinesterase b. causes an explosive release of acetylcholine c. blocks the release of acetylcholine at the neuromuscular junction d. reversibly binds with acetylcholine receptor sites e. blocks the release of NE
If the right sternocleidomastoid contracts unilaterally, the resulting movement will be
A. lateral extension of the head to the right and rotation of the head to the left. B. lateral extension of the head to the left and rotation of the head to the right. C. lateral flexion of the head to the right and rotation of the head to the left. D. lateral flexion of the head to the left and rotation of the head to the right.