Exploring Heart Structure and Function

Which chamber of the heart receives oxygen-poor blood from the body?

• Left atrium

• Right atrium

• Left ventricle

• Right ventricle

What is the main function of the heart valves?

• To pump blood

• To prevent backflow of blood

• To supply oxygen to the heart muscle

• To produce red blood cells

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

• Pulmonary artery

• Pulmonary vein

• Aorta

• Superior vena cava

Arrange the following structures in the correct order of blood flow starting from the right atrium: 1. Right ventricle 2. Pulmonary artery 3. Lungs 4. Left atrium

• 1, 2, 3, 4

• 2, 1, 3, 4

• 1, 3, 2, 4

• 3, 2, 1, 4

Which part of the heart is responsible for pumping oxygenated blood to the entire body?

• Right ventricle

• Left ventricle

• Right atrium

• Left atrium

If a person has a blockage in the pulmonary artery, which part of the blood flow is directly affected?

• Blood flow from the left ventricle to the body

• Blood flow from the right ventricle to the lungs

• Blood flow from the lungs to the left atrium

• Blood flow from the right atrium to the right ventricle

Which sequence correctly describes the path of blood flow through the heart and lungs, starting from the body?

• Body → Right atrium → Right ventricle → Lungs → Left atrium → Left ventricle → Body

• Body → Left atrium → Left ventricle → Lungs → Right atrium → Right ventricle → Body

• Body → Right ventricle → Right atrium → Lungs → Left ventricle → Left atrium → Body

• Body → Left ventricle → Left atrium → Lungs → Right ventricle → Right atrium → Body

A doctor hears an unusual sound in a patient’s heart and suspects a valve problem. Which reasoning best explains how a faulty valve could affect blood flow?

• It could allow blood to flow backward, reducing the efficiency of circulation.

• It would increase the number of red blood cells in the blood.

• It would make the heart beat faster.

• It would stop the heart from pumping blood.

A student is tracing the path of a red blood cell starting in the left atrium. Which of the following is the correct next step in its journey?

• Right ventricle

• Left ventricle

• Right atrium

• Pulmonary artery

Suppose a person has a hole between the right and left atria. Predict and explain what might happen to the oxygen levels in the blood pumped to the body.

• Oxygen levels would increase because more blood mixes with air.

• Oxygen levels would decrease because oxygen-poor and oxygen-rich blood mix.

• Oxygen levels would stay the same because the heart compensates.

• Oxygen levels would not be affected because the hole is small.

Tags

NGSS.HS-LS1-3