What is blood ?Explain its components and functions?
Answers
Blood is a red coloured liquid which circulates in our body. Blood is red because it contains a red pigment called haemoglobin in its red cells. Blood is a connective tissue.
The main components of blood are :
1) Plasma : The liquid part of blood is called plasma. It is a colourless liquid which consists mainly of water with many substances dissolved in it.
2) Red Blood Cells : It carry oxygen from lungs to all the cells of the body.
3) White Blood Cells : It fight infection and protect us from diseases.
4) Platelets : It help in the cogulation of blood in a cut or wound.
Functions of Blood :
1) It carries oxygen from lungs to different parts of body.
2) It carries carbon dioxide from body cell to lungs for breathing out
3) It carries digested food from small intestine to all parts of the body
4) It carries hormones from endocrine glands to different organs of body.
Answer:-
BLOOD:−
=> BLOOD is a red colour liquid which circulates in our body . It is red in colour due to red pigment called HAEMOGLOBIN.
=> It is a connective tissue consist of fluid medium called PLASMA.
3 kinds of cell present in human blood are :-
☄RED BLOOD CELL:−
• These cells are red in colour due to pigment haemoglobin. RBC ( Red Blood Cell ) don't have nuclei.
Function :-
◆ It carries oxgen (O2)from lungs to all the cells of the body and Carbon dioxide (CO2) from body to the lungs (same amount) .Most of CO2 is carried by plasma in dissolved.
☄WHITE BLOOD CELL:−
• These cells are white in colour . All WBC have nucleus though the shape of nucleus is different in different types of WBC.
Function :-
◆ These cells fight with infection and protect us from disease. They eat up germs which cause disease.
☄PLATELETS:−
• They are tiny in fragments of special cell formed in bone narrow. They don't have nuclei
☄Function :-
◆ They help in co - egulation of blood (Clotting of blood) in cut or wound.