Made by :kush sehgal xi science

r.no. 29

Human circulatory system

System that transports food and

nutrients to all body parts

is circulatory

system

Circulatory system

Transportation Blood and its components Function of blood The tubes : Blood vessels The Heart Lymphatic system

contents

Transportation is the movement of materials from one part to another, usually from the region of their availability to the region of their use, storage or elimination. Transportation occurs in all organisms, from microscopic ones to large sized trees and animals It is carried out by circulatory system .In human beings ,this system is made up of tubes, a pumping heart and circulating fluids, blood and lymph. Depending upon the fluid, the circulatory is of two types blood vascular system and lymphatic system.

Transportation

Transport of nutrientsTransport of oxygenTransport of carbon dioxideTransport of waste productsTransport of HormonesMaintenance of waterRegulation of body temperatureMaintenance of pHBody DefensePlugging area of injury

Functions of Blood

Blood : It is a mobile fluid connective tissue of reddish colour that circulates in the human body, supplying nutrients and oxygen to all the living cells and taking away waste products as well as carbon dioxide from them .Its components are :-1.Plasma: It is straw coloured slightly alkaline turbid fluid matrix of blood.2.Blood corpuscles : They are also called formed elements .They are of three types :-i)RBC’s ii) WBC’s iii) Blood platelets

Blood and its components

Human blood flows inside tubes called Blood vessels. Blood vessels are of three types – arteries, veins and capillaries.

Arteries : They are disturbing blood vessels which carry blood coming from heart to various organs of body .

Veins : They are collecting blood vessels which carry blood from various parts of body towards the heart.

Capillaries : They are very narrow blood vessels having a single layered wall which form network inside body organs. Movement of Blood is very slow about 1mm/sec so as to provide time for exchange of materials .

The tubes – Blood vessels

Heart is a conical muscular double pump structure that brings about circulation of blood by its pumping activity. The broader base is upwards while the narrow pointed apex is downwards and tilted towards left . Heart is reddish in color with a size of our fist and weight about 300 gm. Heart lies in the thoracic cavity . Heart is completely partitioned into chambers to prevent mixing of oxygenated and deoxygenated bloods . They are four chambers . The upper or superior chambers are smaller and thin walled. They are called auricles. The other two lower or inferior chambers are smaller and thin walled. They are called ventricles.

Heart

It is a system of capillaries, vessels and lymph nodes which is specialized to collect lymph from tissue fluid and carry the same to blood in the region of subclavian veins .

Lymph : It is a light yellow viscous fluid that is formed from tissue fluid by special lymph capillaries for passage into venous blood . Tissue fluid itself is blood plasma filtered out of the blood capillaries . Lymph does not contain RBC’s and blood platelets .

Lymph vessels : Lymph is formed inside blind tubes called lymph capillaries .

Lymphatic System