Topic 4 - The Blood

Question 1

What does the human circulatory system consist of?

Answer 1

• Blood
• Blood vessels
• Heart

Question 2

What is blood?

Answer 2

A tissue

Question 3

What does plasma contain?

Answer 3

• Red blood cells
• White blood cells
• Platelets

Question 4

What does blood plasma transport?

Answer 4

• Carbon dioxide from the organs to the lungs
• Soluble products of digestion from the small intestine to other organs
• Urea from the liver to the kidneys, where urine is made

Question 5

What are red blood cells?

Answer 5

Biconcave discs

Question 6

What do red blood cells not contain?

Answer 6

A nucleus

Question 7

What is the red pigment in red blood cells called?

Answer 7

Haemoglobin

Question 8

What do the red blood cells do with the haemoglobin?

Answer 8

Combines it with oxygen which forms oxyhaemoglobin in the lungs

Question 9

What do the red blood cells carry?

Answer 9

Oxygen to all of the organs where the oxyhaemoglobin splits back into haemoglobin and oxygen

Question 10

What do white blood cells contain?

Answer 10

A nucleus

Question 11

What do the white blood cells do?

Answer 11

Form part of the body’s defence system against microorganisms

Question 12

What do some white blood cells produce?

Answer 12

• Antibodies

- Antitoxins

Question 13

What do some white blood cells do?

Answer 13

Engulf microorganisms

Question 14

What are platelets?

Answer 14

A small fragment of cells

Question 15

What do platelets not contain?

Answer 15

A nucleus

Question 16

What do platelets do?

Answer 16

Help the blood to clot at the site of a wound

Question 17

What is blood clotting?

Answer 17

A series of enzyme-controlled reactions

Question 18

What does the final reaction cause?

Answer 18

Fibrinogen to change into fibrin

Question 19

What does Fibrin form?

Answer 19

A network of fibres that trap blood cells and form a clot