Understanding the Cardiovascular System

What is the main function of the heart in the cardiovascular system?

• To filter waste from the blood

• To pump blood throughout the body

• To produce hormones

• To digest nutrients

Which blood vessels carry blood away from the heart?

• Veins

• Capillaries

• Arteries

• Venules

What is the primary function of red blood cells?

• To fight infections

• To transport oxygen

• To clot blood

• To produce hormones

Which circulation system carries blood from the heart to the lungs and back?

• Systemic circulation

• Pulmonary circulation

• Coronary circulation

• Lymphatic circulation

What is the main function of capillaries?

• To carry blood at high pressure

• To exchange gases, nutrients, and waste between blood and tissues

• To prevent blood backflow

• To store blood

Which of the following best describes the cardiac cycle?

• The process of blood clotting

• The sequence of events in one heartbeat

• The movement of blood through veins

• The breakdown of red blood cells

What is the main function of veins?

• To carry blood away from the heart

• To carry blood towards the heart

• To exchange gases

• To filter blood

Which blood vessel has the thickest muscular wall?

• Vein

• Capillary

• Artery

• Venule

What is blood pressure a measure of?

• The amount of oxygen in the blood

• The force of blood against the walls of arteries

• The number of red blood cells

• The speed of blood flow

What is prehypertension?

• Blood pressure that is too low

• Blood pressure that is higher than normal but not yet high enough to be classified as hypertension

• A type of heart disease

• A blood clotting disorder