Page 5 - Health & Physical edu- 8

Unit Human Body

1

We have studied about the introduction of human body in the previous grades. In

this grade, we will study the following aspects of the human body.

Circulatory System

Circulatory system refers to the process of joint and smooth functioning of the
heart, blood and blood vessels in the human body. Circulatory system takes the
nutrients, oxygen, hormones and enzymes obtained from different sources to the
cells of the body. The blood returns to the heart in order to be purified. The organs

such as heart, blood vessels, that are involved in the circulatory system and the
blood are described below.
The Heart

The heart lies little inclined on the left of the chest. Its weight in an adult female is
230 to 280 gram and in an adult male is 280 to 340 grams. The part that separates
the right and left part of the heart is called septum. The upper chambers of the heart

(superior venacava)

(right pulmonary artery) (left pulmonary artery)

(right pulmonary veins) (left pulmonary veins)

(aortic)
(pulmonary valve)

(left ventricular valve)
(right ventricular valve)

(septum)

(inferior venacava)

(aorta)
Health & Physical Education, Class-8 1