Blood

Question 1

what is blood made of?

Answer 1

blood cells (50%) floating in plasma (50%)

Question 2

what is plasma?

Answer 2

water and dissolved substances

Question 3

what are the dissolved substances in plasma?

Answer 3

• glucose
• amino acids
• salt
• hormones
• urea
• carbon dioxide

Question 4

what are the main types of blood cells?

Answer 4

• red blood cells

- white blood cells

Question 5

what is the function of a red blood cell?

Answer 5

carry oxygen

Question 6

what is the function of a white blood cell?

Answer 6

fight disease

Question 7

describe a red blood cell

Answer 7

biconcave disc red cell with no nucleus

• contains a protein called haemoglobin which contains iron and carries oxygen
• large surface area to absorb oxygen

Question 8

what are platelets?

Answer 8

fragments of cells

Question 9

what are the types of white blood cell?

Answer 9

• lymphocyte, creates antibodies

- phagocyte, engulf and destroy microbes

Question 10

where are red blood cells made?

Answer 10

bone marrow

Question 11

how long do red blood cells live?

Answer 11

four months

Question 12

where are white blood cells made?

Answer 12

bone marrow and lymph nodes

Question 13

where are platelets made?

Answer 13

bone marrow

Question 14

what are platelets involved in?

Answer 14

blood clotting

Question 15

what is the function of plasma?

Answer 15

transports dissolved substances and heat energy around the body

Question 16

what happens when blood clots?

Answer 16

If a blood vessel is cut, the platelets release chemicals that react with other chemicals in the plasma. Sticky threads of fibrin are made. These threads make a sticky mesh - blood cells and platelets get trapped, making a blood clot.