What Stimulus Initiates the Defecation Reflex

question 62

Multiple Choice

What stimulus initiates the defecation reflex?

• A)release of secretin and cholecystokinin (CCK)by the small intestine
• B)the stretch of the rectum
• C)pressure on the gastroesophageal sphincter
• D)presence of acid in the stomach

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Definitions:

Millimeters

A unit of length in the metric system equal to one-thousandth of a meter.

Motor

Pertaining to movements or mechanisms driven by muscles, referring to the nervous system components that initiate and control physical actions.

Light

Electromagnetic radiation visible to the human eye, essential for human vision and photosynthesis in plants.

Revolving Nosepiece

Part of a microscope that holds the objectives and can be rotated to change magnification.