Bone cells form concentric circles around longitudinal tubes called
A. lacunae.
B. central canals.
C. osteons.
D. canaliculi.
Answer: B
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The dermis has two major layers. Which layer constitutes 80% of the dermis and is responsible for the tension lines in the skin?
A) the papillary layer B) the subcutaneous layer C) the reticular layer D) the hypodermal layer
The ________ within the brain stem is the region most directly responsible for autonomic output
Fill in the blank(s) with correct word
Metabolism of hormones always results in their inactivation
Indicate whether the statement is true or false
Pepsinogen is an
A. active enzyme that digests proteins within the small intestine. B. inactive precursor to a nonspecific enzyme that is synthesized in the pancreas and released in the small intestine. C. inactive precursor to the enzyme pepsin that digests proteins in the stomach. D. active enzyme that is released in the small intestine and digests carbohydrates.