Cardiovascular System

What are the main components of the cardiovascular system?

• Heart, lungs, and blood

• Heart, blood, and blood vessels

• Heart, lymphatic system, and blood

• Lungs, blood vessels, and blood

What is the primary function of the fluid found in the pericardial cavity?

• To transport oxygen to the heart muscle

• To provide nutrients to the heart

• To serve as a lubricant, allowing the heart to contract and relax with minimal friction

• To filter waste products from the blood

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Which statement accurately describes the blood carried by pulmonary arteries and pulmonary veins?

• Pulmonary arteries carry oxygenated blood, and pulmonary veins carry deoxygenated blood.

• Both pulmonary arteries and pulmonary veins carry oxygenated blood.

• Pulmonary arteries carry deoxygenated blood, and pulmonary veins carry oxygenated blood.

• Both pulmonary arteries and pulmonary veins carry deoxygenated blood.

What is the composition of the walls of capillaries?

• Three layers: tunica externa, tunica media, and tunica intima.

• A thick layer of smooth muscles and connective tissue.

• Solely a thin endothelium with its basement membrane.

• A double-walled protective sac.