Slow muscle fibers
A) have less oxygen than do fast fibers.
B) are about two-thirds the diameter of fast fibers.
C) can continue to contract long after fast fibers have fatigued.
D) take twice as long to contract after stimulation as do fast fibers.
E) None of the answers are correct.
C) can continue to contract long after fast fibers have fatigued.
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One of the divided origins of a muscle is termed a head.
Answer the following statement true (T) or false (F)
Both insulin and glucagon are peptide hormones that target liver cells. The responses of the target cells to these two hormones are exactly the opposite of each other. This information implies that
A) each of the two hormones uses a different second messenger. B) one of the hormones does not interact with a membrane receptor. C) both hormones interact with receptors at the cell nucleus. D) one hormone binds to a receptor on the cell membrane and the other to an intracellular receptor.
Blood pressure in the glomerulus is unusually high compared to other capillaries because the diameter of the __________ is greater than that of the __________.
A. efferent arteriole; peritubular capillaries B. descending limb; ascending limb C. afferent arteriole; efferent arteriole D. cortical radiate artery; cortical radiate vein E. proximal tubule; distal tubule
Accessory structures of the skin originate from the
A) dermis. B) subcutaneous layer. C) epidermis. D) basement membrane.