The pyramids of the kidney are:
a. the inner part of the kidney
b. the triangular divisions of the medulla
c. the outer part of the kidney
d. an expansion of the upper end of the ureter
b. the triangular divisions of the medulla
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What is the name of the column of neurons within the medulla that initiates neural impulses for inspiration and expiration?
A. Pontine respiratory center B. Ventral respiratory group C. Dorsal respiratory group D. Phrenic nucleus
Which of the following is true of the bony matrix of the skeleton as people age?
A) The proportion of collagen fibers in the matrix increases with age. B) Its composition remains constant throughout life. C) Its mineral content diminishes as a normal part of aging. D) It gains calcium carbonate while losing calcium phosphate. E) None of the answers are correct.
B lymphocytes
a. are responsible for antibody-mediated immunity b. are activated by thymosin c. mature and differentiate into macrophages d. bind with foreign antigen in association with self-antigen e. are attacked by AIDS virus
Which of the following terms is synonymous with columns as in columns of white matter in the spinal cord?
A) fasciculi B) funiculi C) horns D) tracts