Circulatory System – Notes

Life Processes

The circulatory system consists of the heart and blood vessels.

Plasma contains suspended red blood cells, white blood cells and Platelets.

Red blood cells contain a pigment called haemoglobin.

In newborn babies, 17 to 22 gm/dl of haemoglobin should be present in the blood. For children, the normal range is between 11 and 13gm/dl and for adults it is between 12 and 18gm/dl.

Arteries carry blood away from the heart.

Veins carry blood to the heart.

Lymph is a colourless fluid. It contains less protein that plasma.

Fishes have two chambered hearts.

Amphibians and reptiles have three chambered hearts.