1.2 The Circulatory System

Which statement best describes the circulatory system's role in gas exchange?

• The circulatory system takes in oxygen during inhalation and removes CO₂ during exhalation.

• The circulatory system contracts to make more space in the chest during inhalation, causing oxygen to flow into the lungs.

• The circulatory system receives oxygen from the alveoli and delivers that oxygen to the rest of the body.

• The circulatory system brings oxygen to the alveoli, which deliver oxygen to the lungs.

Which activity is a function of the circulatory system?

• The circulatory system moves nutrients through the body.

• The circulatory system reacts to stimuli in the environment.

• The circulatory system regulates heartbeat and blood pressure.

• The circulatory system removes waste gases from our body through exhalation.

Which are the smallest blood vessels in the body?

• arteries

• capillaries

• veins

• arterioles

Which blood vessels move blood toward the heart?

• arteries

• capillaries

• veins

• arterioles

Use the diagram to help you answer this question. Which list is the correct order of chambers that blood flows through in the heart?

• LV → LA → RV → RA

• RV → RA → LV → LA

• LA → LV → RA → RV

• RA → RV → LA → LV

What are the bottom chambers of the heart through which blood leaves the heart?

• ventricles

• atria

• septum

• venules

What are the top chambers of the heart through which blood enters the heart?

• ventricles

• atria

• septum

• venules

Which is NOT a way we can keep our hearts healthy?

• Eat a healthy diet.

• Exercise frequently.

• Keep a healthy weight.

• Only smoke after turning 18 years old.