A.1.3 Cardiovascular system

Which of the following best describes the primary function of platelets in blood?

• Transport oxygen throughout the body

• Fight infection and foreign invaders

• Form clots to stop bleeding

• Regulate body temperature

What is the primary role of erythrocytes in the blood?

• Assist in blood clotting

• Transport oxygen and carbon dioxide

• Protect against infections

• Regulate blood pressure

Which blood vessels have thick muscular walls to handle high pressure?

• Veins

• Arteries

• Capillaries

• Venules

What is the correct formula for calculating cardiac output?

• Heart Rate ÷ Stroke Volume

• Heart Rate × Blood Pressure

• Stroke Volume × Blood Pressure

• Heart Rate × Stroke Volume

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

• Left atrium

• Right atrium

• Left ventricle

• Right ventricle

What percentage of total blood flow can active muscles demand during intense exercise?

• 50%

• 70%

• 80%

• 90%

What is considered a normal blood pressure reading for an adult?

• 140/90 mmHg

• 90/60 mmHg

• 120/80 mmHg

• 160/100 mmHg

During dynamic exercise, what typically happens to diastolic blood pressure?

• It increases significantly

• It remains relatively constant

• It decreases significantly

• It fluctuates rapidly

Which blood vessels are the primary site of gas exchange with tissues?

• Arteries

• Veins

• Capillaries

• Arterioles

Which process describes the widening of blood vessels?

• Vasoconstriction

• Vasodilation

• Hemostasis

• Hemoconcentration