circulatory system& blood components

Question 1

what are the components of the circulatory system?

Answer 1

it has three main components which are : blood, blood vessels and the heart

Question 2

function of rbc?

Answer 2

transport oxygen from the lungs to all parts of the body and carbon dioxide from the body back to the lungs

Question 3

structure of rbc?

Answer 3

1. contain haemoglobin to carry oxygen
2. biconcave shape to provide a large surface area for the diffusion of oxygen
3. no nucleus to provide more space for haemoglobin

Question 4

function of wbc?

Answer 4

defend the body against disease
there are two types :
1. lymphocytes : make antibodies and antitoxins
2. phagocytes : engulf and digest pathogens/microorganism

Question 5

structure of wbc?

Answer 5

1. large cells that contain a nucleus

Question 6

function of platelets?

Answer 6

convert fibrinogen to fibrin. fibrin forms a mesh that traps blood.
important in blood clotting and scab formation
or
clotting by converting soluble fibrinogen to insoluble ibrin to prevent blood loss and the entry of pathogen

Question 7

structure of platelets?

Answer 7

cell fragments (very small)

Question 8

function of plasma?

Answer 8

transport blood cells, digested food molecules (eg: glucose), carbon dioxide, urea and hormones.
salts and other chemicals are present in the blood plasma, to keep its concentration similar to the concentration of the blood cells

Question 9

structure of plasma?

Answer 9

yellow coloured liquid

Question 10

difference between lymphocytes and phagocytes structure?

Answer 10

1. lymphocyte has a rounded nucleus meanwhile phagocyte has lobed nucleus
2. lymphocyte has non-granular cytoplasm meanwhile lymphpcyte has granular cytoplasm