S. MORRIS 2006

Components of the circulatory system

The circulatory system has three components:

1. vessels(arteries, capillaries ,veins and

lymphatics )

2. pump (heart)

3. fluid(blood , lymph or hemolymph )

Functions of bloodIn the mammals

1. To carry partially digested food material from thesmall intestine and oxygen from the lungs to thecells.

2.To transport the waste products of metabolism from the cells to the kidneys, lungs, and skin for elimination from the body.

3.To carry hormones from the endocrine glands to the cells they control.

4. To control the amount of water and the level of acidity inside the cells.

5. To provide antibodies and white cells that protects

the body against infection.

6. To provide substances that will clot blood if blood

vessels are damaged.

7. To carry enzymes throughout the body.

8. To distribute heat produced during cell

metabolism.

Plasma

A straw-coloured liquid that carries the cells and the platelets which help blood clot.

• carbon dioxide

• glucose

• amino acids

• proteins

• minerals

• vitamins

• hormones

• waste materials

like urea.

It also contains useful things like;

Open and Closed Circulatory System

Vein

Insects, arthropods, mollusks Earthworms, squids, octopuses, vertebrates

Single and Double Circulation

Blood Vessels

The heart the blood

The vessels the blood (to &from all the cells of

the body )

Three kinds of vessels

(1 )Arteries

(2 ) Veins

(3 ) Capillaries

pumps

carry

Arteries are made up of

1. Tunica intima (innermost )

2. Tunica media

3. Tunica adventitia

Artery and Vein

Vein

Artery

Three types of Capillaries

Fetal Circulation

Coronary circulation

Hepatic portal Circulation

Inferior venacava

Internal structure of mammalian heart

Working of the heart

The Lymphatic System

Exchange of materials between blood & body tissues

Lymphatic System

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