The principal means of increasing heat production in response to a cold environment is:
A. vasoconstriction of blood vessels in the skin.
B. wearing warm clothing.
C. shivering thermogenesis and increased voluntary activity.
D. vasodilation of blood vessels in skin.
E. increasing food intake to elevate the metabolic rate.
C
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When the potential of a cell membrane becomes less negative, or gains more positive charges, the term __________ is applied
Fill in the blank with the correct word.
Bile salts bind at their hydrophobic regions to large fat globules within the chyme that enters the duodenum. Bile salts break up the fat globule into smaller fat droplets. This role of bile salts is best described as ________
A) lipid emulsification B) lipid absorption C) lipid ingestion D) lipid digestion
The affinity of hemoglobin for oxygen ________.
A. is greater than the affinity for carbon monoxide B. is increased in response to metabolic alkalosis C. is increased in methemoglobin D. decreases as the height above sea level increases
The ________ develop(s) into the chorion during the embryonic development.
A. granulosa cells B. trophoblast C. embryoblast D. mesenchyme