Another name for the tertiary bronchi is the ________ bronchi.
Fill in the blank(s) with the appropriate word(s).
segmental
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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 and contraction of the sigmoid colon and rectum. c. can be overridden by voluntary contraction of the external anal sphincter. d. both (a) and (b) above. e. all of these answers.
The paired erectile bodies in the penis are the
A) membranous urethra. B) penile urethra. C) corpus spongiosum. D) corpora cavernosa. E) prepuce.
Structure J represents a
A) myosin head.
B) sarcomere.
C) T tubule.
D) myofilament.
E) myofibril.
What tunic is the thickest in veins?
a. tunica media b. tunica intima c. tunica externa