$6\ \text{CO}_2 + 6\ \text{H}_2\text{O} + \text{light} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\ \text{O}_2$

$\text{pH} = -\log \{\text{H}^+\}$

Question 1

Which of the following best describes the hierarchical levels of structural organization in the human body, from smallest to largest?

Accepted Answer

Chemical → Cellular → Tissue → Organ → Organ System → Organism

Question 2

Which organ system is primarily responsible for transporting nutrients, oxygen, and waste products throughout the body?

Accepted Answer

Cardiovascular system

Question 3

Which cellular organelle is responsible for producing ATP, the main energy currency of the cell?

Accepted Answer

Mitochondrion

Question 4

Photosynthesis is the process by which plants convert sunlight into chemical energy. Which equation best represents this process?

Accepted Answer

$6\ 	ext{CO}_2 + 6\ 	ext{H}_2	ext{O} + 	ext{light} ightarrow 	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6\ 	ext{O}_2$

Question 5

Which molecule is the primary energy source for animals and humans, used to power the synthesis of ATP?

Accepted Answer

Glucose

Question 6

In the food chain, how is energy transferred from the sun to a wolf?

Accepted Answer

Sun → Vegetation → Deer → Wolf

Question 7

Which of the following is NOT a function of the digestive system?

Accepted Answer

Production of hormones

Question 8

Which accessory organ produces bile, an emulsifier necessary for fat digestion?

Accepted Answer

Liver

Question 9

What is the main function of the small intestine in digestion?

Accepted Answer

Absorption of nutrients and chemical digestion

Question 10

Which enzyme is responsible for breaking down starch into simple sugars in the mouth?

Accepted Answer

Salivary amylase

Question 11

Which equation correctly represents the calculation of pH from hydrogen ion concentration?

Accepted Answer

$	ext{pH} = -\log \{	ext{H}^+\}$

Question 12

Which of the following best explains why the stomach does not digest itself?

Accepted Answer

The stomach produces a mucus layer and bicarbonate that protects cells from acid

Question 13

Which process is responsible for moving food along the GI tract via wave-like contractions of smooth muscle?

Accepted Answer

Peristalsis

Question 14

Which digestive enzyme is produced in the stomach and is responsible for protein digestion?

Accepted Answer

Pepsin

Question 15

Which of the following is a correct breakdown product of triglycerides during digestion?

Accepted Answer

Glycerol and fatty acids

Question 16

Which structure increases the surface area for absorption in the small intestine?

Accepted Answer

Circular folds, villi, and microvilli

Question 17

Which condition is caused by the escape of acidic chyme from the stomach into the esophagus?

Accepted Answer

Heartburn (GER)

Question 18

Which of the following is a primary cause of peptic ulcers?

Accepted Answer

Helicobacter pylori infection

Question 19

Which dietary strategy is recommended for managing Irritable Bowel Syndrome (IBS)?

Accepted Answer

Eat fiber-rich foods and increase physical activity

Question 20

Which of the following best describes the difference between IBS and IBD?

Accepted Answer

IBD is a chronic inflammatory condition, while IBS is a functional disorder without inflammation

Digestion and the Human Body: Structure, Function, and Nutritional Relevance

Study Guide - Practice Questions