The Defecation Reflex

question 235

Multiple Choice

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
• C) involves contraction of the sigmoid colon and rectum
• D) can be overridden by voluntary contraction of the external anal sphincter
• E) all of these

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Definitions:

Wavelength

The distance between two consecutive peaks or troughs in a wave, typically used in the context of electromagnetic spectra.

Apical Dominance

The phenomenon where the main, central stem of the plant is dominant over (grows more strongly than) other side stems.

Auxin

A plant hormone that promotes root formation and bud growth.

Auxin

A class of plant hormones that plays a crucial role in coordinating growth and behavioral processes in the plant's life cycle.