The two positive feedback loops involved in the defecation reflex are __________.
a. internal and external sphincter muscles
b. the anorectal canal and the rectal columns
c. stretch receptors in rectal walls and the sacral parasympathetic system
d. mass movements and peristaltic contractions
Answer: c. stretch receptors in rectal walls and the sacral parasympathetic system
You might also like to view...
The embryonic heart actually begins working before its development is complete.
Answer the following statement true (T) or false (F)
The attachment of a muscle's tendon to the stationary bone is called the _____; the attachment of the muscle's other tendon to the movable bone is called the _____
a) origin, action b) insertion, action c) origin, insertion d) insertion, origin e) insertion, action
Elderly people tend to have rougher skin and more brittle hair than younger people. What structure is associated with this problem?
A) merocrine glands B) sebaceous glands C) ceruminous glands D) apocrine glands E) eccrine glands
The follicular phase of the ovarian cycle coincides with which phase or phases of the uterine cycle?
A. both the menstrual phase and the secretory phase B. the secretory phase C. both the follicular phase and the secretory phase D. both the proliferative phase and the secretory phase E. both the menstrual phase and the proliferative phase