Animals are net
A. O2 consumers and CO2 producers.
B. O2 and CO2 producers.
C. O2 and CO2 consumers.
D. O2 producers and CO2 consumers.
A. O2 consumers and CO2 producers.
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Which class of antibody accounts for the bulk of the circulating antibody?
A. IgA B. IgD C. IgG D. IgE
Which of the following is a direct result of depolarizing the presynaptic membrane of an axon terminal?
A) Voltage-gated calcium channels in the membrane open. B) Synaptic vesicles fuse with the membrane. C) The postsynaptic cell produces an action potential. D) Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft.
There are approximately ___ light receptors in the human eye.
a. 126 million b. 100 billion c. 126 thousand d. 12.6 million
The hair cells in the utricle detect
A) subsonic sound vibrations. B) volume and pitch of sounds. C) differences in air pressure waves. D) position of the head with respect to gravity.