Contraction of which of the following aid in defecation?
1) external anal sphincter
2) circular colon muscles
3 longitudinal rectal muscles
4) internal anal sphincter
5) diaphragm
6) abdominal muscles
A) 2, 3, 5, 6
B) 1, 2, 3, 4
C) 1, 2, 4
D) 3, 5, 6

Question

Contraction of which of the following aid in defecation? 
1) external anal sphincter
2) circular colon muscles
3 longitudinal rectal muscles
4) internal anal sphincter
5) diaphragm
6) abdominal muscles
A) 2, 3, 5, 6
B) 1, 2, 3, 4
C) 1, 2, 4
D) 3, 5, 6

Quizplus · Accepted Answer

Defecation involves the relaxation of the internal and external anal sphincters and the contraction of the longitudinal rectal muscles, diaphragm, and abdominal muscles to increase abdominal pressure and facilitate stool expulsion.

Contraction of Which of the Following Aid in Defecation