________ is characterized by a decreased surface area for gas exchange in the lungs.
Fill in the blank(s) with the appropriate word(s).
Emphysema
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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
The cyclical shedding of the lining of the uterus in response to changes in hormonal levels is called ____________________
Fill in the blank(s) with correct word
The functional unit of the kidney is called ________.
a)the renal hilus b)the renal corpuscle c)the nephron d)Bowman's capsule
Where are the visual pigments located in the rods and cones?
-inside membrane discs stacked in the outer segment -inside a photosensitive nucleus -in mitochondria located in the outer segment -in the inner segment of photoreceptors -sandwiched in the cell membrane of the photoreceptors