Effector cells that respond to acetylcholine released from postganglionic neurons have
A. somatotrophic receptors.
B. muscarinic receptors.
C. adrenergic receptors.
D. nicotinic receptors.
E. macrotinic receptors.
B
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A heavyset middle-aged insurance salesman, who doesn't exercise often, accepts his friend's invitation to a pickup basketball game. When attempting a jump shot, he falls to the ground in pain, grasping at the calf of his leg. There is an enormous bulge in his leg immediately below the popliteal fossa, and he is unable to plantar flex that foot. Most likely he has injured his __________ and the bulge is __________.
A. quadriceps tendon; his rectus femoris B. calcaneal tendon; his triceps surae C. patellar ligament; his fibularis longus D. tibia; a previously undetected bone tumor E. hamstrings; a large hematoma (blood clot)
What is the functional role of the T tubules?
A) stabilize the G and F actin B) enhance cellular communication during muscle contraction C) hold cross bridges in place in a resting muscle D) synthesize ATP to provide energy for muscle contraction
Which of the following changes will result in increased blood flow at an injury site during inflammation?
A) increased blood volume B) increased vessel diameter C) increased blood pressure D) decreased peripheral resistance E) relaxation of precapillary sphincters
A chemical reaction rate can be increased by either ________ the temperature or ________ the activation energy.
A. decreasing; increasing B. increasing; increasing C. decreasing; decreasing D. increasing; decreasing