Blood Vessels And The Heart

Question 1

What is Plasma and what does it do?

Answer 1

The blood plasma is a yellow liquid. The plasma transports all of your blood cells and some other substances around your body. Plasma carries red and white blood cells and platelets.

Question 2

What do Red Blood Cells do?

Answer 2

The Red Blood Cells pick up oxygen from the air in your lungs and carry it to the cells where it is needed.

Question 3

What are the White Blood Cells and what do they do?

Answer 3

They have a nucleus and is the body’s defence system against harmful microorganisms.

Question 4

What are platelets and what do they do?

Answer 4

Platelets are small fragments of cells. They have no nucleus. They are important in helping the blood to clot at the site of a wound.

Question 5

Name some features about arteries.

Answer 5

• Thick Walls
• Thick layer of muscle and elastic fibres
• Carry blood away from the heart
• Very dangerous to cut
• Feel as a pulse
• Bright red oxygenated blood

Question 6

Name some features about veins.

Answer 6

• Relatively thin walls
• Often have valves
• Large lumen
• Carry blood away from organs
• Low oxygen
• No pulse

Question 7

Name some features about capillaries.

Answer 7

• The wall is a single cell thick
• Tiny vessel that narrow lumen
• Network of tiny vessels
• Link artieries and veins
• Enables oxygen and glucose to diffuse easily
• CO2 passes easily

Question 8

What is the Double Circulatory System?

Answer 8

The Double Circulatory Sytem is where the blood must pass through the heart TWICE to perform one complete circuit of the body.

Question 9

What is the circuit for the Double Circulatory System?

Answer 9

• Heart > Lungs > Heart

- Heart > Body > Heart