If a person wearing a head, neck, and upper chest shield is subjected to a high dose of radiation, one of the resultant health problems might be damage to bone marrow in exposed body regions. If the bone marrow damage occurred in an adult, which cell types might initially no longer be produced in sufficient numbers for the proper immune response to be sustained?
A) B cells
B) NK cells
C) all lymphocytes
D) T cells
E) B cells and NK cells
E) B cells and NK cells
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Early menopause in women will occur if
A) erythropoietin levels are maintained at too high a level in the blood. B) androgen production becomes too high. C) the production of estrogens declines too much to support ovulation. D) insulin levels and production decline too rapidly. E) None of the answers are correct.
The presence of abundant smooth endoplasmic reticulum in vertebrate liver cells is related to its function in
a. steroid hormone production. b. enzyme secretion. c. detoxification of harmful substances. d. protein synthesis. e. calcium storage.
Which of the following statements is true regarding the gray matter of the cerebrum?
A. It is located only in the cerebral cortex. B. It is found in the cerebral cortex of the frontal, parietal, and occipital lobes but does not cover the entire temporal lobe. C. It is found both in the superficial cortex and in deeper basal nuclei. D. It consists mainly of nerve cell bodies and unmyelinated fibers and is found both in the superficial cortex and in the substantia nigra. E. It consists mainly of nerve cell bodies and myelinated fibers.
Renin hydrolyzes angiotensinogen, which is released from the ________, to form angiotensin I
A) spleen B) liver C) lungs D) kidneys E) heart