Organization And Structure Of The Body


 
 
Concept Explanation
 

Organization And Structure Of The Body

All living things are made up of one or more cells. For this reason, cells are known as the structural units or the building blocks of life.

In an organism made up of only one cell (unicellular), the single cell performs all the activities necessary for life. In an organism made up of many cells (multicellular), the various life activities are performed by different groups of cell.

Organization of body :-

Cell :-

Cell is the smallest structural and functional unit of an organism. It is the building block of a living organism. It is a membrane bound and is made up of cytoplasm, genetic material and other cell organelles.

Tissue : 

A group of cells that performs a special job together is known as a tissue. Blood, bone, muscle and skin are some of the tissues in your body. For example, muscle tissues are a group of cells, specialized to contract and expand for the movement of body parts.

Organ :

Tissues combine to form an organ. Each organ performs some important function of the body. For example, the heart is an organ that pumps blood to various parts of the body. The eye is an organ that enables you to see. Lungs, kidneys and liver are some other organs which perform important roles in your body.

Organ system :

 Groups of organs work together to carry out various life activities in our body. For example the food pipe, stomach, small intestine, large intestine and some other organs together help you to digest the food you eat. Such a group of organs is called an organ system. The group of organs that carry out digestion of food collectively form the digestive system. Some other systems in your body are: circulatory, respiratory, nervous, urinary (or excretory), reproductive, muscular and skeletal system .

The main systems in the human body and their functions are given:

ORGAN SYSTEM  MAIN ORGANS  MAIN FUNCTIONS
Skeletal system   bones gives support to the body; protects internal organs; allow movement
Muscular system  muscles  movement of body parts
Circulatory system  heart, blood, blood vessels transport nutrients and oxygen to all parts of body; transports waste
Nervous system  brain, spinal cord, nerves controls all functions of the body 
Respiratory system  nose, wind pipe, lungs takes in oxygen and remove carbon dioxide gas
Digestive system teeth, food pipe, stomach, small intestine, large intestine  Digest and absorb nutrients necessary for growth and maintainance of the body
Excretory system  kidneys,ureters,bladder, urethra, skin removes waste from the body
Reproductive system female : ovaries, oviducts, uterus, penis produces offsprings

All these systems together form your body. They all work to keep you alive. Thus, the human body, and the bodies of all multiceliular living organisms, are organized as follows:

                          Cellsrightarrow Tissuesrightarrow Organrightarrow Organ: System

                               

 

Sample Questions
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Question : 1

Which of the following are correct :

(a) Cell is the smallest structural and functional unit of an organism.

(b) A group of cells that performs a special job together is known as a tissue.

Right Option : C
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Question : 2

In which of these organ system do the males and females have different organs?

Right Option : D
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Question : 3

A group of cells that performs a special job together is known as a ___________________.

Right Option : A
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Explanation
 
 
 


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