Biology For Class IX - Chapter No.9 - Transport - Definitions, Difference and Short Question Answers

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CHAPTER 9
TRANSPORT

By Mrs. Ayesha Arif
(Jauhar Progressive School)

Source: Special Thanks To Sir Syed Arif Ali

By Mrs. Ayesha Arif
(Jauhar Progressive School)

molluscs.
(ii) Closed circulatory system:
This type of system allows blood to flow inside the closed tubular blood vessels and never comes out in direct contact with tissues.

Q: Explain in detail the transport in man?
In multi-cellular organisms like mammals including man, many cells are situated away from environment. Only simple diffusion is not enough to supply O2 (oxygen) to these cells and to get rid of wastes from there. It needs proper transport system to carry substances from one part of the body to another.

Circulatory System:
The system involved in the transport of various substances within the body of an animal is called Circulatory System. The circulatory system transports gases like O2 , CO2 etc, nutrients, wastes, hormones and defense proteins.

Types of circulatory system
There are two types of Blood Circulatory Systems found in animals

1. Open circulatory system
2. Closed circulatory system

In man transport of neutrients is carried out through closed circulatory system.
Closed circulatory system:
This type of system allows blood to flow inside the closed tubular blood vessels and never comes out in direct contact with tissues.
In man the closed circulatory system consists of following components.

1. Blood: A fluid with cells and other dissolved substances.
2. Heart: A pumping, pulsatile organ.
3. Blood vessels: Tubes i.e. Arteries, veins and capillaries.

This is much more efficient and rapid system of transport.

BLOOD:
Blood is a specialized body fluid (a connective tissue) that is composed of:

• A liquid called Blood Plasma

Source: Special Thanks To Sir Syed Arif Ali

By Mrs. Ayesha Arif
(Jauhar Progressive School)

Source: Special Thanks To Sir Syed Arif Ali