When is the thymus most active?

A) during old age
B) during middle age
C) throughout life
D) during infancy and youth
E) from puberty to adulthood


D) during infancy and youth

Anatomy & Physiology

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Lungs in fish originally evolved as a simple evagination of the

a. gills. b. integument. c. buccal cavity. d. pharynx. e. digestive system.

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What structure regulates what enters the colon from the ileum?

A) ileocecal valve B) internal anal sphincter C) external anal sphincter D) pyloric sphincter

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A typical skeletal muscle cell contains approximately _____ mitochondria

A.  3 B.  30 C.  300 D.  3000

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Define phenobarbital

What will be an ideal response?

Anatomy & Physiology