The Circulatory System

Question 1

Pulmonary artery

Answer 1

Carries deoxygenated blood (which has a high carbon dioxide concentration) away from the heart to the lungs

Question 2

Vena Cava

Answer 2

The main vein of the body; returns deoxygenated blood at low pressure from organs and tissues to the heart

Question 3

Right atrium

Answer 3

Receives deoxygenated blood from the vena cava

Question 4

Tricuspid valve

Answer 4

Prevent blood flowing back into the atrium from the ventricle

Question 5

Tendons

Answer 5

Tightened to make sure that the valve doesn’t turn inside out when the ventricle contracts

Question 6

Wall of the right ventricle

Answer 6

Less muscular than the left ventricle because it only needs to force blood to the lungs

Question 7

Pulmonary vein

Answer 7

Returns oxygenated blood from the lungs. A vein from each lung join together before entering the left atrium

Question 8

Left atrium

Answer 8

Received oxygenated blood returning from the lungs.