12 Jun The largest portion of the human brain
Question
Question 20
The largest portion of the human brain, and that part responsible for consciousness, is the:
a. midbrain
b. corpus callosum
c. cerebrum
d. medulla oblongata
e. cerebellum
1 points
Question 21
Which of the following statements is true?
a. All action potentials of the same nerve are alike
b. Receptors respond by graded potential
c. Different nerves convey different information by going to different areas of the brain
d. Differences in intensities may be due to the number of receptors and nerves involved in response
e. All of the above
1 points
Question 22
Cigarette smoking:
a. Inhibits mucus production
b. Kills infection-fighting phagocytes
c. Stimulates ciliary action
d. All of these choices
1 points
Question 23
Which of the following can be successfully cured with antibiotics?
a. genital warts and gonorrhea
b. AIDS
c. AIDS and genital warts
d. genital warts
e. gonorrhea
1 points
Question 24
After an action potential passes:
a. the potassium gates disappear
b. the original voltage difference across the membrane is restored by the sodium-potassium pump
c. the sodium gates are open
d. all of these choices
1 points
Question 25
At the time of sperm penetration, the egg is a(n)
a. ootid.
b. primary oocyte.
c. secondary oocyte.
d. oogonium.
e. ovum.
1 points
Question 26
Coordination of muscles with sensory input is controlled by which part of the brain?
a. midbrain
b. corpus callosum
c. cerebrum
d. medulla oblongata
e. cerebellum
1 points
Question 27
The average amount of gas that moves in and out of the lungs during a normal breathing cycle is ____ liter.
a. 1.0
b. 0.5
c. 4.2
d. 5.7
e. 2.5
1 points
Question 28
The air that reaches the alveoli has been cleaned by the action of:
a. Ciliated epithelium lining parts of the respiratory tract
b. Nose hairs
c. Mucus secreted along the respiratory tract
d. All of these choices
1 points
Question 29
Chemoreceptors in the brain sense and adjust the rate of breathing in response to _________ concetration in the cerebrospinal fluid that surrounds them.
a. Nitrogen
b. Oxygen
c. Hydrogen ion
d. Carbon monoxide
e. Carbon dioxide
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