Theories Of Circulatory System Theory

1187 Words5 Pages
Underlying theory:
• Circulatory system theory:
It is the body’s main transport system, the system is made up of the heart, the blood and the blood vessels. The blood transports oxygen, carbon dioxide, hormones and nutrients, . The circulatory system is a closed system which means that blood flows around the body enclosed in blood vessels and does not leave the blood vessels. The heart:
The heart consists of many layers:
1. The pericardium- It has two layers.
(i) An outer layer which contains a fibrous covering that wraps around the heart and holds it in place.
(ii) An inner layer which has special fluid to lubricate the heart preventing friction from occurring.

2. The myocardium- this contains a strong layer of cardiac muscle which makes the bulk of the heart. It can vary in thickness and it is responsible for the pumping action of the heart
3. The Endocardium - Innermost layer of the heart that is made up of epithelial tissue, it is a smooth lining that keeps blood from sticking to the heart and preventing harmful blood clots from forming.
The heart is then divided into four different chambers:
Two smaller upper chambers-
(i) The right atrium- this is where the superior and inferior vena cava pump deoxygenated blood into the heart from the upper ( superior) and lower (inferior) parts of the body.
(ii) The left atrium- where the pulmonary veins bring oxygenated blood from the lungs and the aorta brings oxygenated blood from the heart to the

More about Theories Of Circulatory System Theory

Open Document