Cardiovascular System

This system provides rapid transportation of water, nutrients, electrolyes, hormones, enzymes, antibodies and gases to all cells. In addition, it contributes to body defences, the coagulation process and controls body temperature. The primary components include circulating fluid ( blood ) , a pump ( heart ) and numerous connected tubes ( blood vessels ) .

Blood

Whole blood is composed of water, solutes and cells. It provides nutrients, oxygen, chemical instructions and waste removal for all cells and tissues. These functions are essential to homeostasis and life.

Circulating blood cells are classifed as :

Erythrocytes ( red blood cells )

RBC's are circular or biconcave disk of about 7 micro m in diameter. There are about 5 million red blood cells in a cubic mm of blood. Within each mature RBCs are millions of hemoglobin molecules that carry four oxygen and one carbon dioxide. RBC's are formed in bone marrow, eg: ribs, vertebrae, humerus, etc. Their life span is approximately 120 days and is destroyed daily in liver, spleen and bone marrow. Its function is to carry oxygen from the lungs to the tissues. The surface membranes of RBCs contain antigens that designate the individual's blood type.

( 584 1705 , 9 580 7503 ( P )
Born : 10 March 1954

Holy Matrimony : 3 June 1995
Place : Bethesda ( Bedok-Tampines ) Church

ÿ Email : revival3@singnet.com.sg

Regards,

Wong Chee Kong

" Train a child in the way he should go, and when he is old he will not depart from it "
( Proverbs 22 : 6 )

" . . . out of his heart will flow rivers of living water ."
( John 7 : 38 )

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