The shape of the external ear is maintained by ________.
A) adipose tissue
B) elastic cartilage
C) hyaline cartilage
D) fibrocartilage
B) elastic cartilage
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The shedding of blood-colored tears is known as ________________________________________
Fill in the blank(s) with correct word
____________________ are cells that form and contain black pigment.?
Fill in the blank(s) with correct word
A flattened lens
A. is necessary for both near and far vision. B. functions only with color vision. C. is necessary for distant vision. D. is necessary for near vision. E. reflects light rays.
When a catecholamine or peptide hormone binds to receptors on the surface of a cell, the
A) hormone receptor complex moves into the cytoplasm. B) cell membrane becomes depolarized. C) second messenger appears in the cytoplasm. D) cell becomes inactive. E) hormone is transported to the nucleus where it alters the activity of DNA.