The defecation reflex involves
A) sympathetic nerves.
B) relaxation of both the internal and external anal sphincters.
C) conscious control of both the internal and external anal sphincters.
D) relaxation of the ileocecal valve to move feces into the rectum.
E) parasympathetic nerve control from sacral nerves.
B
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Which is the neurotransmitter that causes the release of calcium ions and initiates the steps of skeletal muscle fiber contraction?
A. Acetylcholine B. Acetylcholinesterase C. Norepinephrine D. Serotonin
The ____________________ is the longest, heaviest, and strongest bone in the human body.
Fill in the blank(s) with the appropriate word(s).
Label A represents which structure(s)?
A) myenteric plexus
B) mesenteric artery and vein
C) lymphatic vessel
D) submucosal plexus
E) mucosal gland
The cell receives its shape from a network of microtubules and filaments known as the ________.
A. cytoskeleton B. endoskeleton C. exoskeleton D. microskeleton