Why isn't an action potential transmitted from a postsynaptic membrane to a presynaptic terminal?
A. Presynaptic terminals have no acetylcholine receptors.
B. Presynaptic neurons do not have a resting membrane potential.
C. Acetylcholine can only diffuse in one direction across the synaptic cleft.
D. Synaptic vesicles in the postsynaptic membrane are inactive.
E. Acetylcholine is destroyed too fast.
A
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Lipids
A. contain C, H, and O, but with proportionately less oxygen than in carbohydrates. B. include phospholipids, cholesterol, and fats. C. are insoluble in water. D. All of the answer choices are correct.
The events of respiration are
A) ventilation, external and internal respiration, and cellular respiration. B) inhaling and exhaling. C) inflating and deflating alveoli. D) delivering carbon dioxide to cells and removing oxygen from cells.
A _____ is a polar covalent bond that joins two amino acids together through a synthesis reaction.
Fill in the blank(s) with the appropriate word(s).
Which structure in the muscle cell stores calcium?
A) sarcoplasmic reticulum B) sarcolemma C) transverse tubules D) myofibril