What is the role of pacemaker cells?
A. They are part of the intracellular cytoskeleton.
B. They are shallow invaginations of the plasma membrane.
C. They maintain relatively constant tension for a period of time.
D. They are enzymes that remove phosphate from myosin.
E. They rapidly develop action potentials.
Answer: E
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The volume of air that enters the lungs during forced maximal inspiration is the
A. inspiratory reserve volume. B. vital capacity. C. tidal volume. D. expiratory reserve volume.
By blocking the effect of acetylcholine at muscarinic but not nicotinic receptors, atropine is able to block parasympathetic effects while not influencing sympathetic activity at all
Indicate whether the statement is true or false
If a person is normovolemic and consumes a large quantity of a hyperosmotic solution, it will
A) have no effect on cell osmolarity and thereby cell size. B) cause cells to swell due to an increase in the osmolarity of extracellular fluid. C) cause cells to shrink due to an increase in the osmolarity of extracellular fluid. D) cause cells to swell due to a decrease in the osmolarity of extracellular fluid. E) cause cells to shrink due to a decrease in the osmolarity of extracellular fluid
Most parasympathetic fibers reach their target organs by way of which nerve?
A. Vagus B. Oculomotor C. Trigeminal D. Splanchnic E. Accessory