Question 1

Which of the following best describes the role of the diaphragm during inspiration?

Accepted Answer

The diaphragm contracts and moves downward, increasing the space in the chest cavity.

Question 2

What is the primary function of alveoli in the respiratory system?

Accepted Answer

To facilitate the exchange of $$O_2$$ and $$CO_2$$ between air and blood.

Question 3

A patient is unable to form blood clots efficiently after an injury. Which blood component is most likely deficient?

Accepted Answer

Platelets (thrombocytes)

Question 4

Which structure prevents food from entering the larynx during swallowing?

Accepted Answer

Epiglottis

Question 5

During forced expiration, which muscles contract to help expel air from the lungs?

Accepted Answer

Abdominal muscles

Question 6

Which of the following best explains why mature mammalian erythrocytes (red blood cells) lack nuclei?

Accepted Answer

To allow more space for hemoglobin and maximize oxygen transport.

Question 7

A person inhales a harmful pathogen. Which structure in the respiratory tract is primarily responsible for trapping and moving the pathogen out of the airway?

Accepted Answer

Cilia and mucus in the tracheal lining

Question 8

Which of the following is NOT a function of circulating blood?

Accepted Answer

Production of hormones

Question 9

If the pleural fluid is absent or greatly reduced, what is the most likely consequence?

Accepted Answer

Friction between pleural layers will increase, causing pain during breathing.

Question 10

Which of the following best describes the path of blood flow through the heart and lungs?

Accepted Answer

Right atrium → right ventricle → pulmonary artery → lungs → left atrium → left ventricle → aorta

Question 11

A person with a genetic disorder cannot produce enough hemoglobin. Which of the following is a likely consequence?

Accepted Answer

Reduced ability to transport oxygen in the blood

Question 12

Which of the following statements about blood plasma is correct?

Accepted Answer

It contains nutrients, wastes, hormones, and ions.

Question 13

Which of the following best explains why the ribs are important to the respiratory system?

Accepted Answer

They protect the organs of the thoracic cavity.

Question 14

A patient has a blockage in the bronchioles. Which of the following is the most immediate effect?

Accepted Answer

Reduced airflow to the alveoli, impairing gas exchange

Question 15

Which of the following is the correct sequence of events in the formation of a blood clot after a vessel is damaged?

Accepted Answer

Platelets adhere → prothrombin converts to thrombin → fibrin forms a mesh → clot forms

Question 16

Which of the following best describes the function of white blood cells?

Accepted Answer

Defend the body against pathogens

Question 17

If the hard palate is damaged, which process is most likely to be affected?

Accepted Answer

Separation of the nasal and oral cavities

Question 18

Which of the following is a direct result of the contraction of intercostal muscles during inspiration?

Accepted Answer

Increase in chest cavity volume

Question 19

A person is exposed to a toxin that destroys alveolar type II cells. What is the most likely consequence?

Accepted Answer

Reduced production of surfactant, leading to alveolar collapse

Question 20

Which of the following best explains why the pulmonary artery is unique among arteries?

Accepted Answer

It carries deoxygenated blood from the heart to the lungs.

Study Guide: Respiratory and Circulatory Systems

Study Guide - Practice Questions

Study Guide - Flashcards