Examlex
The inferior portion of the spinal cord and the abdominal wall receive blood from the ________.
Heart
A muscular organ in most animals, which pumps blood through the blood vessels of the circulatory system by rhythmic contraction and dilation.
Arrector Pili
Small muscles connected to hair follicles that, when contracted, cause hair to stand up, producing 'goosebumps'.
Goose Bumps
The raising of small bumps on the skin due to the contraction of miniature muscles at the base of hair follicles, usually in response to cold or fear.
Hair Follicles
The skin organ that produces hair, consisting of a small tubular cavity containing the root of a hair and located in the dermis of the skin.
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