Cardio Respiratory Physiology & Vital Signs

What is the main function of the human heart?

• Regulating body temperature

• Producing red blood cells

• Pumping blood throughout the body

• Filtering waste from the blood

Answer explanation

The main function of the human heart is to pump blood throughout the body.

Which type of vessel carries blood away from the heart?

• Lymphatic vessel

• Capillary

• Artery

• Vein

Answer explanation

Arteries carry blood away from the heart. They transport oxygen-rich blood to the body's tissues and organs.

What is the purpose of the valves of the heart?

• Filter out toxins from the blood

• Regulate blood pressure

• Prevent blood from flowing backward

• Control oxygen levels in the blood

Answer explanation

The purpose of the heart valves is to prevent blood from flowing backward, ensuring proper blood circulation.

Which vessel carries blood from the lungs back to the heart?

• Pulmonary artery

• Pulmonary vein

• Superior vena cava

• Aorta

Answer explanation

The pulmonary vein carries oxygenated blood from the lungs back to the heart, making it the correct choice.

What is the name of the vessel that carries blood from the heart to the rest of the body?

• Aorta

• Superior vena cava

• Pulmonary artery

• Pulmonary vein

Answer explanation

The vessel that carries blood from the heart to the rest of the body is called the Aorta. It is the largest artery in the body.

What is the role of capillaries in the circulatory system?

• To carry blood away from the heart

• To exchange oxygen, carbon dioxide, and other substances between blood and body cells

• To prevent backflow of blood

• To filter toxins from the blood

Answer explanation

Capillaries exchange oxygen, carbon dioxide, and other substances between blood and body cells.

Where does the blood go after leaving the left ventricle?

• Back to the lungs

• To the liver

• To the brain

• To the rest of the body

Answer explanation

After leaving the left ventricle, the blood goes to the rest of the body. This is the correct choice as it accurately describes the pathway of blood circulation.

What are the four valves of the heart?

• Aortic, Ventricular, Bicuspid, Mitral

• Aortic, Pulmonic, Tricuspid, Mitral

• Aortic, Bicuspid, Tricuspid, Erb's

• Aortic, Erb's, Tricuspid, Mitral

Answer explanation

The four valves of the heart are Aortic, Pulmonic, Tricuspid, and Mitral. These valves regulate the flow of blood through the heart.

Which of these is the sound heard when the tricuspid and mitral valve close?

• S1

• Dub

• Lub

• S2

Answer explanation

The sound heard when the tricuspid and mitral valve close is called 'Lub'. It is also known as S1. This sound indicates the beginning of systole and the closure of the atrioventricular valves.

Which of these is the sound heard when the pulmonic and aortic valves close?

• S1

• Dub

• Lub

• S2

Answer explanation

The sound heard when the pulmonic and aortic valves close is called 'Dub'. It is also known as the second heart sound (S2).