Which of the following is NOT true of corticospinal fibers?
A. They may synapse directly on alpha motor neurons.
B. They may synapse directly on gamma motor neurons.
C. They may synapse directly on interneurons.
D. They are collectively sometimes called the extrapyramidal system.
E. They may synapse with afferent neurons in ascending pathways.
D
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When a blood vessel is damaged, which of the following events occurs last?
A. Platelets are activated. B. von Willebrand factor is produced. C. Collagen is exposed. D. Platelets begin to stick to each other and form a plug. E. Platelets adhere to collagen.
The hard sharp ridge of the shin that can easily be felt below the skin is the
a) anterior border (crest) of the tibia. b) tibial tuberosity. c) medial condyle of the tibia. d) tibiofemoral joint. e) intercondylar eminence.
In the diagram, where do pluripotent stem cells come from?
a) A b) B c) C d) D e) None of these choices
Stretching a skeletal muscle beyond rest length reduces the force of contraction because of:
A. increased Ca++ sensitivity of actin-myosin interaction B. increased Ca++ influx through stretch activated channels C. decreased actin-myosin overlap D. decreased Ca++ uptake by the SR E. decreased intracellular pH