The defecation reflex
a. is initiated when mass movements force fecal material into the rectum, stimulating stretch receptors in the rectal wall
b. involves relaxation of the internal anal sphincter
c. involves contraction of the sigmoid colon and rectum
d. can be overridden by voluntary contraction of the external anal sphincter
e. has all of the above characteristics
E
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Clusters of nerve cell bodies in the peripheral nervous system are called
A) glia. B) nodes. C) ganglia. D) microglia. E) neuroglia.
The mitral valve is located between the left atria and left ventricle.
a. true b. false
An osteoclast has a ruffled border and multiple nuclei.
Answer the following statement true (T) or false (F)
The diminished levels of estrogen and progesterone during menopause can cause what symptom?
A. Increased bone mass B. Thicker vaginal secretions C. Hot flashes D. Heavier menstrual periods