Which of the following statements about the action potential is false?
A) The rapid depolarization phase is caused by the entry of potassium ions.
B) During the repolarization phase, sodium channels close and potassium channels open.
C) During the depolarization phase, membrane potential becomes positive.
D) During the hyperpolarization phase, the ion pumps re-establish the sodium and potassium concentrations across the cell membrane.
E) Repolarization occurs as potassium ions leave the axon.
A
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Fill in the blank(s) with the appropriate word(s).
What gives eyes their characteristic color?
A) the density and distribution of melanocytes in the pupil B) the density and distribution of melanocytes in the iris C) the density and distribution of blood vessels in the vascular layer D) the density and distribution of blood vessels in the retina E) the density and distribution of melanocytes in the retina
The leukocyte that will migrate in the blood and take up residence in the tissues as macrophages is the
A. basophil. B. neutrophil. C. lymphocyte. D. eosinophil. E. monocyte.
This figure shows a frontal section of the cerebrum. What structure does number 2 indicate?
A. Fourth ventricle B. Third ventricle C. Lateral ventricle D. Corpus callosum E. Cerebral nuclei