3.2 Mechanical And Chemical Digestion

Question 1

What is mechanical digestion?

Answer 1

The physical breakdown of food into smaller pieces.

Question 2

What is chemical digestion?

Answer 2

The biochemical process of breaking down food into simpler molecules using enzymes.

Question 3

Which part of the digestive system primarily conducts mechanical digestion?

Answer 3

The mouth.

Question 4

True or False: Chemical digestion begins in the stomach.

Answer 4

True.

Question 5

Fill in the blank: The enzyme __________ begins the digestion of carbohydrates in the mouth.

Answer 5

salivary amylase.

Question 6

What role does the stomach play in digestion?

Answer 6

It performs both mechanical and chemical digestion.

Question 7

Multiple choice: Which of the following is NOT a part of mechanical digestion? A) Chewing B) Churning C) Enzyme action D) Segmentation

Answer 7

C) Enzyme action.

Question 8

What is the function of bile in digestion?

Answer 8

Bile emulsifies fats to aid in their digestion.

Question 9

True or False: The small intestine is mainly responsible for chemical digestion.

Answer 9

True.

Question 10

What is peristalsis?

Answer 10

The wave-like muscle contractions that move food through the digestive tract.

Question 11

Fill in the blank: __________ are proteins that speed up chemical reactions in digestion.

Answer 11

Enzymes.

Question 12

Multiple choice: Which enzyme is responsible for protein digestion? A) Amylase B) Lipase C) Pepsin D) Lactase

Answer 12

C) Pepsin.

Question 13

What is the primary site of nutrient absorption?

Answer 13

The small intestine.

Question 14

True or False: The large intestine is primarily involved in chemical digestion.

Answer 14

False.

Question 15

What is the role of saliva in digestion?

Answer 15

Saliva moistens food and contains enzymes that begin the digestion of carbohydrates.

Question 16

Fill in the blank: The __________ produces digestive enzymes and bicarbonate to aid digestion in the small intestine.

Answer 16

pancreas.

Question 17

Multiple choice: Which part of the digestive system is mainly responsible for the absorption of water? A) Stomach B) Small intestine C) Large intestine D) Esophagus

Answer 17

C) Large intestine.

Question 18

What is chyme?

Answer 18

The semi-liquid mass of partially digested food that moves from the stomach to the small intestine.

Question 19

True or False: Mechanical digestion is more important than chemical digestion in nutrient absorption.

Answer 19

False.

Question 20

What is the role of the gallbladder in digestion?

Answer 20

The gallbladder stores and concentrates bile.

Question 21

Fill in the blank: The __________ is the first part of the small intestine.

Answer 21

duodenum.

Question 22

Multiple choice: Which type of digestion occurs in the esophagus? A) Mechanical B) Chemical C) Both D) Neither

Answer 22

A) Mechanical.

Question 23

What is the main function of the digestive system?

Answer 23

To break down food into nutrients that can be absorbed by the body.

Question 24

True or False: Enzymes are consumed in the reactions they catalyze.

Answer 24

False.

Question 25

What is the role of gastric acid in digestion?

Answer 25

Gastric acid helps to denature proteins and activates digestive enzymes in the stomach.