Observe the image well. Then choose the correct statement.

• A is an artery since it has the biggest lumen to carry more blood.

• A is a vein since it is very elastic.

• B is an artery because it has thick muscular and elastic walls.

• B is a vein since all veins have a small lumen

Arteries have a thick elastic wall to:

• Carry oxygenated and deoxygenated blood to all parts of body.

• Pump the blood to rest of body.

• Withstand the high pressure exerted by the blood.

Capillaries are the link between arteries and veins. Capillaries are efficient because: (Tick all the right answers)

• 1 cell thick for a short diffusion distance

• Blood in them travels at a very high speed to ensure diffusion

• Blood in them travels at a very low speed to ensure diffusion

• The network of capillaries creates a large SA for efficient diffusion.

Name the main artery of the human body.

• Pulmonary Artery

• Hepatic Artery

• Aorta

The vein that is rich in digested nutrients such as glucose and AA is:

• Hepatic Vein

• Renal Vein

• Vena Cava

• Hepatic Portal Vein

The blood vessel with high levels of urea is the

• Renal Vein

• Hepatic Vein

• Hepatic Artery

In the heart which ventricle has the thickest wall?

• left ventricle

• right ventricle

In the elderly persons, the pulse rate tends to fall with age. This means that:

• They would have enough oxygen circulating around their body.

• They can feel fatigued due to less oxygen circulating around their body.

• They are more prone to diseases.

Graph A shows the heartbeat of:

• A trained person because the heart is beating faster at each level of exercise.

• An untrained person because the heart is beating faster at each level of exercise.

• An untrained person because it shows the smallest recovery time.

• A trained person because trained persons always experience a long recovery period after exercise.

The recovery time after strenuous exercise is important to:

• pay off the oxygen debt experienced during exercise

• to ensure anaerobic respiration occurs

• have a stronger pulse