In smooth muscle, where does the calcium needed for contraction come from?
A. The sarcoplasmic reticulum
B. Mitochondria
C. Intercalated discs
D. The motor nerve fiber
E. The extracellular fluid
E. The extracellular fluid
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A drug that functions as an agonist
A. blocks a receptor so that the neurotransmitter cannot bind. B. causes great pain if taken in too high a dose. C. activates a receptor, helping a neurotransmitter bind or triggering an action potential in some other way. D. relieves pain.
During heart transplants, the _____ nerves are severed resulting in a faster resting heart rate (approximately 100 beats per minute) after the transplant
a) glossopharyngeal b) cardiac accelerator c) vagus d) phrenic e) cervical spinal
Which portion of the fibula articulates with the talus?
A) calcaneus B) medial malleolus C) head D) lateral malleolus
Multiunit smooth muscle is located in the
A. reproductive system. B. wall of blood vessels. C. gastrocnemius. D. wall of the GI tract. E. wall of the heart.