Page 148 - Primary Six Notes

Blood circulation is the movement of blood from the heart to

all other parts of the body.

Blood circulation is very important in the following ways:

1. It supplies food and oxygen to all parts of the body

2. It removes waste products, such as carbon dioxide, out of

the body to the excretory organs.

There are two types of blood circulation: Single and double

circulation.

1. Single Blood Circulation

It is the types of circulation when blood moves through heart

once, e.g. in fish.

2. Double Blood Circulation

It is the type of circulation when blood goes to the heart twice
before it goes to all other body parts e.g. in mammals.

BLOOD

Blood is a tissue fluid with suspended cells that moves in and

around the body.

Blood Composition

1. Red blood cells (erythrocytes)

2. White blood cells (leucocytes)

3. Platelets (thrombocytes)

4. Plasma