Laxatives

Definition

Laxatives are substances that promote bowel movements to relieve constipation. They can work through various mechanisms including increasing stool bulk, softening stool, or stimulating intestinal muscles.

5 Must Know Facts For Your Next Test

1. There are four main types of laxatives: bulk-forming, osmotic, stimulant, and stool softeners.
2. Overuse of laxatives can lead to dependency and damage to the digestive tract.
3. Bulk-forming laxatives like psyllium absorb water into the intestines and make stools easier to pass.
4. Osmotic laxatives like polyethylene glycol draw water into the bowel from surrounding tissues.
5. Stimulant laxatives such as senna or bisacodyl trigger rhythmic contractions in the colon.

Review Questions

• What are the four main types of laxatives?
• How do osmotic laxatives function to alleviate constipation?
• What are some potential risks associated with overusing laxatives?

Related terms

Constipation:

Infrequent or difficult bowel movements often requiring straining.

Fiber:

An indigestible part of plant foods that aids in bowel regularity.

Gut Microbiota:

The community of microorganisms living in the human intestine important for digestion and overall health.