unit 4

Question 1

what does plasma do?

Answer 1

transports dissolved substances around the body (hormones, antibodies, nutrients, waste substances)

Question 2

what is the role of erythrocytes?

Answer 2

•carry oxygen through the blood
•cells are tiny to allow them through narrow capillaries

Question 3

what is the structure of erythrocytes?

Answer 3

•flattened disc shape to increase surface area for diffusion
•cells contain haemoglobin which absorbs oxygen in the lungs and releases it to the rest of the body

Question 4

what do the three types of leucocytes do?

Answer 4

•lymphocytes- destroys viruses and cancer cells
•monocytes- removes dead cells and bacteria
•neutrophills- produce antibodies

Question 5

what do thrombocytes do?

Answer 5

•form clots at wound sites
• platelets join together with fibrinogen to make a web, forming a clot

Question 6

how does temperature regulation work?

Answer 6

•cells in body carry out respiration for energy
•some of energy is heat, warming the blood
•body distributes heat evenly to keep body at 37°c
•if any lower of higher, hypothalamus will detect and set off changes to return to 37°c