The contractile unit of a muscle is the ____
a. sarcomere
b. myosin head
c. phosphate group
d. myofibril
e. actin filaments
ANSWER: a
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In terms of surface area for exchanges, gill filaments are analogous to the __________ in the
digestive system.
a. small intestine b. villi c. stomach d. pancreas
Which is the correct order of the activity of the
hormones involved in gamete formation?
a. GnRH>>LH>>FSH>>testosterone b. FSH>>LH>>GnRH>>testosterone c. GnRH>>FSH>>LH>>testosterone d. LH>>FSH>>GnRH>>testosterone e. LH>>FSH>>GnRH>>testosterone
The first sphincter through which food passes is between the ____ and the ____
a. esophagus; stomach b. pharynx; esophagus c. stomach; small intestine d. small intestine; large intestine e. colon; rectum
Do arteries always carry highly oxygenated blood? Explain your answer. What will be an ideal response?