Question 1

Which of the following best describes the function of surfactant in the alveoli?

Accepted Answer

It decreases the surface tension of alveolar fluid, making it easier for the lungs to expand.

Question 2

A patient has a puncture wound to the chest that causes air to enter the pleural cavity. Which pressure is directly affected, and what is the likely consequence?

Accepted Answer

Intrapleural pressure; lung collapse (pneumothorax)

Question 3

Which equation correctly represents the relationship between pressure, volume, and airflow in the lungs according to Boyle's Law?

Accepted Answer

$$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 4

Which respiratory center in the brain is primarily responsible for setting the basic rhythm of breathing?

Accepted Answer

Ventral respiratory group (VRG)

Question 5

How does CO2 contribute to blood pH balance?

Accepted Answer

CO2 decreases blood pH by forming carbonic acid.

Question 6

Which of the following best explains why the partial pressure of oxygen is lower in tissues than in alveoli?

Accepted Answer

Oxygen is consumed by cellular respiration in tissues.

Question 7

Which structure is NOT part of the alimentary canal?

Accepted Answer

Pancreas

Question 8

Which layer of the alimentary canal contains the myenteric plexus, and what is its primary function?

Accepted Answer

Muscularis externa; controls peristalsis and segmentation

Question 9

A patient is unable to digest fats properly. Which accessory organ is most likely malfunctioning, and what is its role?

Accepted Answer

Liver; produces bile to emulsify fats

Question 10

Which of the following best describes the function of the peritoneal membranes?

Accepted Answer

They anchor and protect abdominal organs.

Question 11

Which equation best represents the conversion of CO2 and water to carbonic acid in the blood?

Accepted Answer

$$CO_2 + H_2O$$ \rightarrow H_2CO_3$$

Question 12

Which of the following is TRUE regarding chyme?

Accepted Answer

It is the mixture of partially digested food and gastric juices in the stomach.

Question 13

Which nervous system branch primarily controls peristalsis in the digestive tract?

Accepted Answer

Enteric nervous system

Question 14

A patient has difficulty swallowing due to nerve damage. Which layer of the alimentary canal is most likely affected?

Accepted Answer

Muscularis externa

Question 15

Which of the following statements about the structure of the stomach is correct?

Accepted Answer

The stomach contains rugae to increase surface area for absorption.

Question 16

Which process is responsible for moving food through the digestive tract?

Accepted Answer

Peristalsis

Question 17

Which of the following best explains how oxygen is transported in the blood?

Accepted Answer

Oxygen binds to hemoglobin in red blood cells.

Question 18

Which of the following is NOT a function of accessory digestive organs?

Accepted Answer

Absorption of nutrients

Question 19

Which pressure gradient drives the movement of air into the lungs during inspiration?

Accepted Answer

Alveolar pressure is lower than atmospheric pressure

Question 20

Which of the following best describes the role of the circular and longitudinal muscle layers in the small intestine?

Accepted Answer

They control segmentation and peristalsis to mix and move contents.

Respiratory and Digestive Systems: Key Concepts and Processes

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