Human Circulatory System Quiz

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What is the primary function of erythrocytes in the blood?

Carrying oxygen (correct)

Clotting blood

Fighting infections

Transporting carbon dioxide

Which blood type has neither A nor B antigens on erythrocytes?

A

O (correct)

AB

B

Which blood group is characterized by the presence of both A and B antigens?

A

B

AB (correct)

O

How are Rh-positive and Rh-negative blood types determined?

By the presence of the RhD antigen Signup and view all the answers

What component of blood is primarily involved in blood clotting?

Thrombocytes Signup and view all the answers

What role does the cardiovascular system play in regulating body temperature?

It cools the body by transporting excess heat away. Signup and view all the answers

Which type of blood vessel carries blood away from the heart under high pressure?

Arteries Signup and view all the answers

What feature of veins helps to prevent backflow of blood?

Valves Signup and view all the answers

How does blood pressure change as blood travels through arteries?

It fluctuates but generally drops as blood travels. Signup and view all the answers

What is a key characteristic of capillaries that facilitates substance exchange?

One cell thick walls Signup and view all the answers

What initiates the depolarization of the ventricles during the cardiac cycle?

The bundle of His Signup and view all the answers

Which heart valves are open during diastole?

Bicuspid and tricuspid valves Signup and view all the answers

What role do chemoreceptors play in heart rate regulation?

They measure blood pH and CO₂ levels. Signup and view all the answers

What does the QRS complex represent on an ECG?

Ventricular contraction Signup and view all the answers

What happens during systole in terms of heart valves?

Semi-lunar valves are open and atrioventricular valves are closed. Signup and view all the answers

What is the role of the tricuspid valve in the heart?

It allows blood to flow from the right atrium to the right ventricle. Signup and view all the answers

From which part of the heart does oxygenated blood enter the circulation?

Left Atrium Signup and view all the answers

What does the SAN (Sinoatrial Node) initiate in the heart?

Depolarization that causes atrial contraction. Signup and view all the answers

What is the function of the AVN (Atrioventricular Node)?

It delays the electrical impulse before sending it to the ventricles. Signup and view all the answers

How does blood flow from the right ventricle to the lungs?

Through the pulmonary valve. Signup and view all the answers

What is the purpose of heart valves?

To ensure unidirectional blood flow. Signup and view all the answers

What structure conducts the electrical signal throughout the ventricles?

Bundle of His Signup and view all the answers

What does myogenic stimulation indicate about the heart?

Contraction and relaxation are controlled internally. Signup and view all the answers