IB The blood system and heart

State the structures found in veins and the heart that ensure circulation of blood by preventing backflow.

Identify the type of blood vessel that carries blood at high pressure away from the heart

• Capillaries

• Veins

• Arteries

• Veinules

Identify the blood vessel that carries deoxygenated blood from the heart to the lungs

• Pulmonary vein

• Pulmonary artery

• Vena cava

• Aorta

The sino-atrial node is located in which part of the heart?

• Septum

• Wall of the right atrium

• Wall of the left ventricle

• Wall of the left atrium

Identify the blood vessel that drains deoxygenated blood into the right atrium

• Pulmonary vein

• Vena cava

• Aorta

• Pulmonary artery

What term describes cardiac muscle as it does not require nervous simulation to contract?

Which structure of arteries maintains the high pressure of blood?

• Narrow lumen

• Valves

• Fenestration walls

• Thin walls

Which feature of capillaries allows for the exchange of substances?

• Thick walls

• Large lumen

• Valves

• Fenestration walls

What term describes blood with a low concentration of oxygen?

Which 17th century doctor discovered that blood is in circulation?

• Ignaz Semmelweiss

• William Harvey

• Louis Pasteur

• James Watson