Defecation

High school (ages 12+)
Human Body

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/defecation

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the primary waste product?Feces, composed of undigested food, bacteria, sloughed-off intestinal cells, and water
2. What is the propulsion mechanism?Peristalsis, involuntary waves of smooth muscle contraction in the intestinal walls
3. What happens to food after it leaves your stomach?After food leaves the stomach, it moves to the large intestine where nutrients and water are absorbed. The leftover material, along with bacteria and cells, turns into poop. Tiny waves of muscle called peristaltic waves push it toward the rectum.
4. How does your body know when it’s time to poop?When poop fills the rectum, stretch sensors send a signal to the brain. This triggers a reflex that relaxes the inner anal muscle. The outer muscle can be tightened or released so you decide when and where to go.

Peristalsis: Involuntary, wave-like muscular contractions that propel contents through the digestive tract.
Defecation Reflex: An involuntary neural response triggered by rectal distension, initiating the urge to defecate.
Scatological Reticence: The cultural tendency to avoid discussing or acknowledging topics related to feces and defecation.