Question 1

Which of the following best describes the Bohr effect in relation to hemoglobin and oxygen transport?

Accepted Answer

It refers to the increased affinity of hemoglobin for oxygen at higher pH levels, facilitating oxygen loading in the lungs.

Question 2

A patient inhales deeply and holds their breath. Which law best explains the relationship between the pressure and volume of air in their lungs during this maneuver?

Accepted Answer

Boyle's Law: $$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 3

Which anatomical feature prevents food and debris from entering the alveoli during swallowing?

Accepted Answer

Epiglottis

Question 4

Which of the following is TRUE regarding surfactant in the lungs?

Accepted Answer

It reduces surface tension, preventing alveolar collapse.

Question 5

A person is exposed to a high altitude environment. Which physiological mechanism helps maintain oxygen delivery to tissues?

Accepted Answer

Increased production of red blood cells to enhance oxygen carrying capacity.

Question 6

Which of the following best describes the function of bile salts in the digestive system?

Accepted Answer

They emulsify fats, increasing the surface area for lipase action.

Question 7

A patient has a deficiency in intrinsic factor. What condition are they most likely to develop?

Accepted Answer

Pernicious anemia due to impaired vitamin B12 absorption.

Question 8

Which enzyme is secreted by the stomach and is responsible for protein digestion?

Accepted Answer

Pepsin

Question 9

Which of the following events is most likely to trigger the gastrocolic reflex?

Accepted Answer

Stretching of the stomach by food intake.

Question 10

Which cell type in the stomach secretes hydrochloric acid ($$HCl$$)?

Accepted Answer

Parietal cells

Question 11

A patient presents with steatorrhea (fatty stools). Which GI tract secretion is most likely deficient?

Accepted Answer

Bile salts

Question 12

Which of the following best describes the function of the hepatic portal circulation?

Accepted Answer

It transports nutrient-rich blood from the GI tract to the liver for processing.

Question 13

Which hormone stimulates the secretion of pancreatic enzymes and bile in response to fatty acids in the duodenum?

Accepted Answer

Cholecystokinin (CCK)

Question 14

Which of the following is a function of goblet cells in the GI tract?

Accepted Answer

Secretion of mucus to protect and lubricate the lining.

Question 15

Which pressure is responsible for keeping the lungs inflated and preventing collapse?

Accepted Answer

Transpulmonary pressure: $$P_{tp} = P_{alv} - P_{ip}$$

Question 16

Which of the following best explains the difference between the left and right lungs?

Accepted Answer

The right lung has three lobes, while the left lung has two lobes and a cardiac notch.

Question 17

Which of the following is a major function of the villi and microvilli in the small intestine?

Accepted Answer

Increase surface area for nutrient absorption.

Question 18

A patient has a blockage in the common bile duct. Which digestive process will be most affected?

Accepted Answer

Emulsification and absorption of dietary fats.

Question 19

Which of the following best describes peristalsis in the GI tract?

Accepted Answer

Coordinated, wave-like contractions of smooth muscle that propel contents forward.

Question 20

Which chemical is secreted by the stomach and is essential for vitamin B12 absorption?

Accepted Answer

Intrinsic factor

Respiratory and Digestive System Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards