Which epidermal cell has a role in immunity and disease resistance?
a) Intraepidermal macrophages (Langerhans cells)
b) Keratinocytes
c) Melanocytes
d) Tactile epithelial cells (Merkel cells)
e) Podocytes
Answer: a
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During the cephalic phase of gastric stimulation, which of the following does NOT occur?
A. HCl is secreted into the gastric lumen. B. Pepsinogen is secreted into the gastric lumen. C. Seeing, smelling, and/or tasting food reflexively increase(s) gastric acid secretion. D. Parasympathetic stimulation of secretory cells in the gastric mucosa occurs. E. Gastrin is secreted into the gastric lumen.
What is the difference between the anatomy of the cranial nerves and that of the spinal nerves?
A) In cranial nerves, hollow cavities are empty; in spinal nerves, hollow cavities contain cerebrospinal fluid. B) In cranial nerves, damage is always fatal; in spinal nerves, damage can be healed. C) In cranial nerves, the right and left sides act independently; in spinal nerves, movement is connected. D) In cranial nerves, the white matter is surrounded by the gray matter; in spinal nerves, it is the other way around.
The cytoplasm within a cell body of a neuron is called the
A. soma. B. perikaryon. C. neurokaryon. D. chromatophilic substance. E. chromatophobic substance.
) Select the statement about mixtures that is correct.
A) A solution contains solvent in large amounts and solute in smaller quantities. B) Solutions contain particles that settle out in time. C) Suspensions can change reversibly from liquid to solid. D) Suspensions are homogeneous mixtures of two or more components.