Which of the following statements related to the "ON pathway" of the visual system is correct?
A. Bipolar cells fire action potentials only when bright light strikes the photoreceptors linked to them.
B. Bipolar cells spontaneously depolarize in the absence of input from photoreceptor cells.
C. Bipolar cells hyperpolarize in the absence of input from photoreceptor cells.
D. Glutamate receptors on bipolar cells are excitatory.
E. Only cones are associated with bipolar cells of the "ON pathway," rods are not.
B
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The insertion of the anterior part of the frontalis muscle is the
A) temporal bone. B) epicranial aponeurosis. C) occipital bone. D) skin of the eyebrow and the bridge of the nose. E) coronoid process of the mandible.
Of the total inorganic components in bone, calcium accounts for what percent?
A) 17% B) 9.7% C) 39% D) 72% E) 0.72%
Identify the following
White blood cells engulf bacteria by means of ________
A) pinocytosis B) cotransport C) phagocytosis D) receptor-mediated endocytosis E) active transport