9. Blood Vessels + Blood

Question 1

Describe arteries

Answer 1

Carry oxygen rich blood away from the heart. Have thick elastic walls that expand and contract.

Question 2

Describe capillaries

Answer 2

Smallest blood vessels where the exchange of nutrients and waste between the blood and body cells occur.

Question 3

Describe veins

Answer 3

• Carry blood back to the heart.
• Thinner walls than arteries.
• Have valves and muscles in them that help squeeze the blood back to the heart.

Question 4

Describe venous pooling

Answer 4

Blood pooling in the veins in the legs after exercise. This leads to a slower recovery.

Question 5

Define vasodilation

Answer 5

An increase in the diameter of a blood vessel to allow more blood to flow through

Question 6

Define vasoconstriction

Answer 6

A decrease in the diameter of a blood vessel allowing less blood to flow through

Question 7

List the 4 components of blood

Answer 7

Red blood cells, white blood cells, platelets and plasma

Question 8

Describe red blood cells

Answer 8

They carry 02 around the body. Contain haemoglobin.

Question 9

Describe the systemic circulation loop

Answer 9

When oxygenated blood is transported from the left ventricle to the rest of the body and back to the right atrium

Question 10

Describe the pulmonary circulation loop

Answer 10

When deoxygenated blood is transported from the heart to the lungs and return oxygenated

Question 11

Define Blood pressure

Answer 11

Blood pressure is the pressure on the artery walls.

Question 12

Compare systolic and diastolic blood pressure

Answer 12

Systolic blood pressure is when the heart is contracting where as diastolic blood pressure is when the heart is relaxing.