Sumay studied about blood circulation in humans . He wanted to observe the flow of blood and was about to cut his finger a bit. He suddenly stopped realising that this could be fatal.
Read the above passage and answer the following questions.
(a) why is the colour of blood red?
(b) why does unclotted blood comes out from site of injury when platelets are present in the body?
(c) which blood cells when low in number can make us vulnerable to infections?
(d) what values do you think Sumay have?