Blood And Circulation- Triple

Question 1

Describe vaccinations

Answer 1

1. Injected with a dead or inactive pathogen into the body
2. These carry antigens which trigger an immune response
3. Your lymphocytes produces antibodies to attack them
4. Some lymphocytes will remain in the body as memory cells so if the same type of pathogen appears again the antibodies will kill it

Question 2

Platelets

Answer 2

1. Fragments of large cells
2. If the skin is cut the chemical fibrin is made
3. Forms a network around the wound to trap the red blood cells
4. This forms a clot which prevents further loss of blood and entry of pathogens

Question 3

How does your body maintain your temperature of your too hot

Answer 3

1. Lots of sweat is produced
2. Blood vessels widen (vasodilation) which allows more blood To flow near the surface so it can radiate more heat
3. Hairs lie flat

Question 4

How does your body maintain your temperature of your too cold

Answer 4

1. Blood vessels constrict (vasoconstriction) so that less heat can be transferred to its surroundings
2. Shivering generates heat to its muscles
3. Hairs stand on ends to trap an insulating layer of warm air