When acetylcholine binds to receptors at the motor end plate, the end plate membrane becomes
A) more permeable to sodium ions.
B) less permeable to sodium ions.
C) more permeable to calcium ions.
D) less permeable to potassium ions.
E) repolarized.
Answer: A
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The vertebrate heart muscle is known as
A) Pericardium. B) Epicardium. C) Myocardium. D) Endocardium.
Nongated ion channels
A) open in response to small voltage changes. B) open when a ligand binds to its receptor. C) are responsible for the ion permeabilities of the resting plasma membrane. D) allow substances to move into the cell but not out. E) all of the above.
A protein channel that opens or closes in response to a stimulus would be classified as a ______ channel.
A. leak B. gated C. stimulus
Which muscle extends the big toe?
A. Extensor digitorum longus B. Fibularis brevis C. Extensor hallicus longus D. Tibialis anterior E. Soleus