Released by cells as part of the nonspecific, second line of defense against infection, interferon functions in
a. interfering with the replication of extracellular bacteria.
b. inhibiting replication of viruses in cells infected with them.
c. preventing viruses from adhering to the cell surface and injecting their genetic material.
d. is a cytokine that blocks replication of virally infected cells.
e. more than one of these.
B
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Aldosterone release can be triggered by the presence of the blood-borne messenger angiotensin II or by low levels of sodium, and so its secretion regulation is said to be
A. purely neural. B. both hormonal and humoral. C. both antagonistic and synergistic. D. both neural and synergistic. E. purely hormonal.
Which of the following is not true of gray matter?
A. It is found in both the brain and spinal cord. B. It consists of somas, dendrites, and myelinated axons. C. It forms a somewhat butterfly-shaped central core in the spinal cord. D. It is the site of synaptic contact between neurons in the CNS. E. It is not found in the PNS.
The rate of erythropoiesis when erythropoietin is present is greater than the rate of erythropoiesis when erythropoietin is absent
Indicate whether the statement is true or false.
Which structure is continuous with the very delicate corneal epithelium that covers the surface of the cornea?
a. fornix b. palpebral conjunctiva c. ocular conjunctiva d. medial canthus