🫀 Cardiovascular System Quiz

Which of the following have valves?

• Veins
• Arteries
• Capillaries
• All blood vessels

Answer explanation

Veins carry blood back to the heart and need valves to prevent backflow.

Which of the following have a large lumen in comparison to their size?

• Veins
• Arteries
• Capillaries
• All blood vessels

Answer explanation

Veins have a large lumen relative to their wall thickness.

Which of the following have walls one cell thick?

• Veins
• Arteries
• Capillaries
• All blood vessels

Answer explanation

Capillaries have thin walls to allow diffusion.

Which of the following carries blood at high pressure?

• Veins
• Arteries
• Capillaries
• All blood vessels

Answer explanation

Arteries carry blood away from the heart at high pressure.

Which of the following carries blood away from the heart?

• Veins
• Arteries
• Capillaries
• All blood vessels

Answer explanation

Arteries carry blood away from the heart.

State the equation for cardiac output.

• CO = HR × SV
• CO = HR + SV
• CO = HR − SV
• CO = HR ÷ SV

Answer explanation

Cardiac Output = Heart Rate × Stroke Volume.

What does stroke volume measure?

• Blood per minute
• Blood per second
• Blood per beat
• Oxygen capacity

Answer explanation

Stroke volume is the volume of blood pumped per beat.

How is maximum heart rate calculated?

• 220 + age
• 220 − age
• 200 − age
• 200 + age

Answer explanation

Max HR = 220 − Age.

Why does a fitter person have a lower resting HR?

• Stronger diaphragm
• More efficient heart
• Smaller lungs
• Lower cardiac output

Answer explanation

A fitter heart pumps more efficiently with higher stroke volume.

What is the role of a red blood cell?

• Carry oxygen
• Carry carbon dioxide
• Transport nutrients
• All of the above

Answer explanation

RBCs carry oxygen using haemoglobin and remove carbon dioxide.