The plasma of the blood contains about 7%
A) platelets.
B) white blood cells.
C) plasma proteins.
D) red blood cells.
E) All of the answers are correct.
C) plasma proteins.
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Which of the following structures is involved in the air distribution function of the respiratory system?
a. trachea b. alveoli c. bronchi d. both A and C above
X, Y, and Z are adjacent sensory receptors in the skin. During administration of the flu shot, a needle is inserted in the middle of Y's receptive field. All three receptors are activated. Which of the following is likely to be true?
A. The receptor potential in neurons X and Z will be more depolarized than in neuron Y. B. It won't be possible to discriminate which neuron's receptive field was stimulated at its center. C. The frequency of action potentials in the afferent pathway from neuron Y will be increased by excitatory interneurons projecting from the afferent pathways from neurons X and Z. D. The receptor potentials in all three neurons will achieve the same, average value. E. The frequency of action potentials in neuron Y will be greater than that in neurons X and Z.
Consider the following five terms and determine which does not belong
A. medulla oblongata B. pons C. cardiac center D. pyramids E. olives
Sensory impulses originate at receptors in response to
A. local changes in their cell membrane potentials. B. decreasing permeability of nerve cell membranes. C. neurotransmitters. D. subthreshold potential.