If a muscle crosses the ankle joint posteriorly with a vertical direction to its fibers, what action of the foot does it have?
a. Dorsiflexion
b. Plantarflexion
c. Inversion
d. Eversion
Ans: b. Plantarflexion
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Indicate whether the statement is true or false
Loss of descending inhibitory inputs on motor neurons may result in ____
a. spastic paralysis b. flaccid paralysis c. tetanus d. clumsy movement e. cerebral palsy
Which of the following statements concerning negative feedback is incorrect?
a. negative feedback exists when a change in a regulated variable triggers a response that opposes the change. b. negative feedback exists when the input to a system increases the output and the output limits its own production by inhibiting the input. c. with negative feedback, a control system's input and output continue to enhance each other. d. most of the body's homeostatic control mechanisms operate on the principle of negative feedback. e. it is the only mode of extrinsic control.
Athletes who train for endurance rely more on cellular respiration than people who don't train. Their muscle fibers contain more
A. fatty acids. B. water. C. mitochondria. D. lactic acid.