What is NOT true of muscle spindles?
A) The contractile poles of intrafusal fibers within muscle spindles are innervated by ?-motor neurons.
B) Muscle spindles are receptors for the stretch reflex.
C) Muscle spindles are embedded within extrafusal muscle fibers.
D) Muscle spindles are found within tendons.
Answer: D
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The prime mover for extension of the arm at the elbow is the __________ __________.
Fill in the blank(s) with the appropriate word(s).
Active transport
A. requires ATP. B. does not require metabolic energy (ATP). C. can move substances along their concentration gradient. D. involves vesicle formation. E. follows osmotic pressure gradients.
The prime mover of elbow extension is the __________.
A. triceps brachii B. biceps brachii C. brachialis D. anconeus
Male infants can be born with an undescended testis. This means that the testis
A. has lost its blood supply. B. remains in the abdominopelvic cavity. C. covers the top of the scrotum. D. has not properly formed. E. lacks hormonal cells.