On coming inside from the cold, students notice that their cheeks are red. This results from
A. dilation of the blood vessels in the dermis of the cheeks.
B. constriction of the blood vessels in the epidermis of the cheeks.
C. increased permeability of superficial vessels.
D. constriction of the sweat glands in the cheeks.
E. damage to the epidermis by the cold.
A
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The ________ are formed by the cranial bones and prevent contaminants from entering the respiratory tract.
A) sinuses B) turbinates C) bony nasal shelves D) nasal mucous membranes
The process of filtration occurs at the
A) proximal convoluted tubule. B) distal convoluted tubule. C) collecting duct. D) nephron loop. E) glomerulus.
The plasma membrane consists primarily of
A. sugars and proteins. B. phospholipids and nitrogenous bases. C. phospholipids and proteins. D. sugars and starches.
The pineal body
A. connects the two cerebral hemispheres. B. modifies mood. C. causes hot and cold flashes. D. appears to play a role in controlling the onset of puberty. E. plays a role in the production of cerebrospinal fluid.