Human Circulatory System and Heart Structure

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What is the function of semilunar valves in the heart?

Regulate the flow of nutrients in the blood

Filter waste products in the blood

Prevent blood from flowing back into the ventricles (correct)

Transport oxygen to the body's tissues

What term refers to the medical condition where coronary arteries are narrowed due to plaque buildup?

Atherosclerosis (correct)

Coronary thrombosis

Thrombosis

Atheroma

Which blood vessels carry oxygen-rich blood away from the heart?

Arteries (correct)

Venules

Veins

Capillaries

What connects arteries and veins in the circulatory system?

Capillaries Signup and view all the answers

Which of the following is NOT a component of atherosclerotic plaque in coronary arteries?

Iron Signup and view all the answers

What is the main function of red blood cells?

Contain haemoglobin that transports oxygen Signup and view all the answers

What can occur if a piece of plaque breaks away from an artery due to atherosclerosis?

Formation of a thrombus Signup and view all the answers

Which blood vessels bring blood back to the heart?

Veins Signup and view all the answers

What is the primary cause of a heart attack according to the text?

Blockage of coronary arteries by fat and cholesterol Signup and view all the answers

In which individuals is a thrombus more likely to form?

Individuals who are immobile Signup and view all the answers

What is the purpose of platelets in the blood?

Form clots at the site of wounds Signup and view all the answers

What is the medical term for the buildup of materials that adhere to arteries?

Atheroma Signup and view all the answers

Which type of muscle makes up the wall of the heart?

Cardiac muscle Signup and view all the answers

Which valve is located between the right ventricle and the pulmonary trunk?

Pulmonary semilunar valve Signup and view all the answers

Which chamber of the heart receives deoxygenated blood from the body?

Right atrium Signup and view all the answers

What is the shape of the human heart often compared to?

Man's closed fist Signup and view all the answers

What is the function of the aortic semilunar valve?

Prevents backflow from aorta to left ventricle Signup and view all the answers

What does the left atrioventricular valve prevent when the ventricles contract?

Backflow into left atrium Signup and view all the answers