Transportation
All living organisms need a transport system in
their bodies to perform function properly . Hence the circulatory system
consist of Blood , Lymph, Heart ,Arteries and veins .
Blood :
Blood is a connective tissue in humans . It
transport necessary substance to cells and transport metabolic waste
product away from those same cells
The Main Component of blood :
· Plasma
· Red Blood Cells
· platelets
· White Blood Cells
Plasma :
It is yellow colour fluid it transport food, CO2 waste product etc. Almost 55% of the blood is blood plasma.
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Red Blood Cells :
It contain hemoglobin which transport oxygen from
various tissues and organs. The age of RBC is 120 days . The red colour
of blood due to presence of this pigment . Almost 41% of the blood is RBC
Platelets ;
These cells help in blood clotting .
White Blood Cells :
These cells fight against harmful bacteria ,
virus and germs .Almost 4% of the blood is white blood cells
Blood Vessels
Blood vessels are variety of pipes which carry the blood . There are three types of blood vessels in our body . arteries , capillaries , and veins .
Arteries : These carry oxygenated blood from heart to body pats except pulmonary artery . These are the thick and elastic , This is because blood flow through them at high pressure .
Capillaries : The smallest vessels which are one cell are called capillaries .The oxygenated blood from arteries enter into the capillaries in all the part of the body .
Veins : veins carry deoxygenated blood
from body parts to heart except pulmonary veins. These are thin and less elastic