Which lymphoid organ undergoes a drastic age-related involution (decline in function and size)?
a. Gut-associated lymphoid tissue of the gastrointestinal tract
b. Lymph node
c. Palatine tonsil
d. Spleen
e. Thymus
ANS: E
The thymus undergoes a dramatic involution with aging.
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Which is not a correct association of an endocrine gland with a hormone it secretes?
A. Anterior lobe of the pituitary - melatonin B. Adrenal medulla - epinephrine C. Thyroid gland - calcitonin D. Adrenal cortex - glucocorticoids E. Pancreas - glucagon
Presbycusis refers to age-associated
a) progressive loss of hearing in one ear. b) progressive loss of hearing in both ears. c) progressive loss of near-vision. d) otitis media. e) vertigo.
Major muscle compartments are separated from each other by ________ septa.
Fill in the blank(s) with the appropriate word(s).
The layers of bone tissue immediately deep to the periosteum are
A) circumferential lamellae. B) osteoid plates. C) trabeculae. D) concentric lamellae. E) epiphseal ridges.