LG 3.3: The Human Circulatory System Quiz

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What is the daily energy output of the heart, according to the text?

Enough energy to drive a truck 10 miles

Enough energy to drive a truck 30 miles

Enough energy to drive a truck 20 miles (correct)

Enough energy to drive a truck 40 miles

How many times does the heart beat in a year, as mentioned in the text?

1.5 billion times

4.8 billion times

3.6 million times

2.5 billion times (correct)

What is the main function of arteries in the human cardiovascular system?

Carry blood back to the heart

Supply nutrients to the body cells

Filter waste materials from the blood

Carry blood away from the heart (correct)

In the context of the human circulatory system, what is the role of veins?

Carry blood back to the heart Signup and view all the answers

What is the fluid that fills the circulatory system, as mentioned in the text?

Blood Signup and view all the answers

What is the significance of the heart having its own electrical impulse?

It allows the heart to beat even when separated from the body Signup and view all the answers

What is the primary purpose of the pericardium?

To cover the heart and large blood vessels attached to the heart Signup and view all the answers

Which of the following valves prevents blood from flowing back into the left atrium when the left ventricle contracts?

Bicuspid valve Signup and view all the answers

What separates the atria from the ventricles in the heart?

Atrioventricular septum Signup and view all the answers

Which layer of the heart is primarily composed of cardiac muscle?

Myocardium Signup and view all the answers

Where is the tricuspid valve located in the heart?

Between the right atrium and right ventricle Signup and view all the answers

What is the function of the pulmonary valve?

To prevent blood from flowing back into the right ventricle Signup and view all the answers

What does the endocardium primarily consist of?

Smooth tissue that stretches as the heart pumps Signup and view all the answers

What separates the left and right atria in the heart?

Interatrial septum Signup and view all the answers

Which chamber of the heart is bordered laterally by the lungs?

Left ventricle Signup and view all the answers

Which structure covers the heart and large blood vessels attached to it?

Epicardium Signup and view all the answers

Which of the following occurs first during the cardiac cycle?

Contraction of the atria Signup and view all the answers

In which section of the heart does deoxygenated blood enter from the body?

Right atrium Signup and view all the answers

What is the role of the pulmonary artery?

Transporting deoxygenated blood to the body Signup and view all the answers

Which structure separates the left ventricle from the aorta?

Aortic semilunar valve Signup and view all the answers

During which phase of the cardiac cycle does blood flow back into the left atrium?

Ventricular diastole Signup and view all the answers

Which vessel carries oxygenated blood out to the body from the heart?

Aorta Signup and view all the answers

Which of the following statements about arteries is NOT true?

Arteries are the smallest type of blood vessel Signup and view all the answers

In which blood vessel do skeletal muscle contractions help move blood and valves prevent backflow of blood?

Veins Signup and view all the answers

The aorta is classified as:

The largest artery that takes blood from the heart to the body Signup and view all the answers

Which of these accurately describes capillaries?

Capillaries are about one cell layer thick Signup and view all the answers

Which blood vessel is responsible for carrying blood under no pressure and does not move very easily?

Venules Signup and view all the answers

What is the function of venules in the circulatory system?

Venules connect arterioles to venules Signup and view all the answers

What is the primary role of arteries in the human cardiovascular system?

To carry blood away from the heart under high pressure Signup and view all the answers

Which of the following correctly describes veins?

Veins prevent backflow of blood and supply blood to the heart muscle Signup and view all the answers

Deoxygenated Thin Towards

Vein Signup and view all the answers

Oxygenated Thick Away from

Arteries Signup and view all the answers