Microtubules are composed primarily of:
a. phospholipids
b. actin
c. myosin
d. tubulin
e. enzymes
D
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The substance that prevents collapse of the alveoli during exhalation is __________.
Fill in the blank(s) with the appropriate word(s).
Because of different origin and insertion sites, the flexor carpi radialis muscle flexes and abducts the wrist, while the flexor carpi ulnaris flexes and ________ the same joint.
Fill in the blank(s) with the appropriate word(s).
Most information received by neurons enters at.
A) dendrites. B) axons. C) collaterals. D) hillocks. E) the cell body.
The affinity of hemoglobin for oxygen increases with:
A) increased hydrogen ion concentration. B) increased body temperature. C) increased BPG (2, 3-bisphosphoglycerate). D) increased partial pressure of carbon dioxide.