Which of the following statements about digestion is true?...

Name: Problem 6, Chapter 25: Biology for AP Courses
Uploaded: 2019-08-18T15:21:59-08:00
Duration: 3 min 32 s
Channel: James Thierer
Description: Which of the following statements about digestion is true? a. Pepsin is converted to pepsinogen with the help of hydrochloric acid. b. Starch digestion begins in the mouth. c. Wave-like muscle movements called peristalsis move food from the stomach to the mouth. d. Amino acids are absorbed through the intestinal lining of the ileum.

Which of the following statements about digestion is true? a. Pepsin is converted to pepsinogen with the help of hydrochloric acid. b. Starch digestion begins in the mouth. c. Wave-like muscle movements called peristalsis move food from the stomach to the mouth. d. Amino acids are absorbed through the intestinal lining of the ileum.

Which of the following statements about digestion is true?

a. Pepsin is converted to pepsinogen with the help of hydrochloric acid.
b. Starch digestion begins in the mouth.
c. Wave-like muscle movements called peristalsis move food from the stomach to the mouth.
d. Amino acids are absorbed through the intestinal lining of the ileum.

Key Concepts

Enzymatic Digestion

Enzymatic digestion is the process by which food is broken down into smaller molecules through the action of specific enzymes. Different enzymes target specific nutrients: for example, salivary amylase begins the breakdown of starch in the mouth, while proteases and lipases work further along the digestive tract to digest proteins and fats. This process is essential for converting food into molecules small enough to be absorbed into the bloodstream.

Activation of Gastric Enzymes

In the stomach, inactive enzymes such as pepsinogen are converted into their active forms (pepsin) through the action of hydrochloric acid. This acid not only creates an environment conducive to enzyme activity but also helps denature proteins, making them easier targets for enzymatic digestion. This regulatory mechanism ensures that enzymes are activated at the proper time and place within the digestive system.

Peristalsis

Peristalsis refers to the wave-like muscle contractions that propel food along the digestive tract. This coordinated movement is critical for advancing food from the mouth through the esophagus to the stomach, and then throughout the intestines, facilitating mixing with digestive juices and eventual nutrient absorption.

Nutrient Absorption in the Intestines

The small intestine is the primary site for nutrient absorption, where digested food particles such as amino acids, sugars, and fatty acids are absorbed through the intestinal lining. Different segments of the small intestine specialize in the absorption of specific nutrients, ensuring that the body efficiently captures the necessary compounds for energy and growth.

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