During the defecation reflex, the

A) stretch receptors in the rectal walls stimulate parasympathetic motor neurons.
B) internal and external anal sphincters relax simultaneously.
C) abdominal wall relaxes and the internal abdominal pressure decreases.
D) gastroileal reflex moves materials into the rectum through mass peristalsis.
E) decreased peristaltic contractions occur in the sigmoid colon and rectum.


A) stretch receptors in the rectal walls stimulate parasympathetic motor neurons.

Anatomy & Physiology

You might also like to view...

All of the following are special senses EXCEPT ________

A) touch B) smell C) taste D) hearing

Anatomy & Physiology

The umbilical region is commonly known as the ________.

A. navel B. buttock C. groin D. breastbone E. upper arm

Anatomy & Physiology

The breathing rate of an infant

a) Is twice as fast as an adult b) Causes greater water loss from the lungs c) Removes less carbon dioxide than in an adult d) Makes the infant blood more acidic e) Is normal to an adult

Anatomy & Physiology

Amanda has no visual impairments, but has noticed that in order to see clearly she must hold books farther from her face in order to read. What is happening to Amanda's vision?

A. Her lens is becoming more rigid with age. B. Her lens is becoming more opaque with age. C. Her lens is becoming more convex with age. D. Her vitreous humor is becoming thicker with age. E. Her lens is becoming more flexible with age.

Anatomy & Physiology