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

Anatomy & Physiology

You might also like to view...

Label A represents which structure(s)?


A) myenteric plexus
B) mesenteric artery and vein
C) lymphatic vessel
D) submucosal plexus
E) mucosal gland

Anatomy & Physiology

The cell receives its shape from a network of microtubules and filaments known as the ________.

A. cytoskeleton B. endoskeleton C. exoskeleton D. microskeleton

Anatomy & Physiology

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

Anatomy & Physiology

The ____________________ is the longest, heaviest, and strongest bone in the human body.

Fill in the blank(s) with the appropriate word(s).

Anatomy & Physiology