In adults, red blood cells are made in one place, spend most of their lifespan in another, and most are finally destroyed in yet another place. Which choice lists these locations in the correct chronological order?
A. bone marrow; blood vessels; spleen
B. bone marrow; spleen; blood vessels
C. spleen; blood vessels; spleen
D. blood vessels; spleen; bone marrow
E. spleen; blood vessels; bone marrow
A
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Phototransduction in invertebrates differs from that in vertebrates in that in invertebrates
a. no G-proteins are involved. b. no cation channels are involved. c. no opsins are involved. d. photoreceptors depolarize in response to stimulation. e. first-order cells hyperpolarize in response to stimulation.
Which values are reasonable for a healthy, 80 kilogram resting adult?
A. 4.25 liters of blood pumped per ventricle per minute; 60,000 beats per day B. 5.75 liters of blood pumped per ventricle per minute; 144,000 beats per day C. 6.75 liters of blood pumped per ventricle per minute; 20,000 beats per day D. 7.25 liters of blood pumped per ventricle per minute; 76,000 beats per day E. 5.25 liters of blood pumped per ventricle per minute; 108,000 beats per day
Ventral rami of some spinal nerves join with each other to form a
A. ganglion. B. dermatome. C. cord. D. plexus. E. nerve.
Twitch summation
a. is a means by which gradation of muscle contraction may be accomplished b. results from the additional release of Ca2+ within the cytosol of muscle fibers c. results from increasing the frequency at which motor units are firing within a muscle d. results from more cross bridges binding to actin within muscle fibers e. has all of the above characteristics