Introduction of Human Body:-

Cell is the smallest dependent unit of body. The number of cells group together to form a tissue, the number of tissue group together to form an organ, the number of organs group together to form a system. Multiple systems that work together is made up a human body is system have their own functions and importance.

What is Human Body:-

Human body is combination of multiple system which have different ability to perform work.

Types of system in human body:-
1 Nervous system
2 Cardiovascular system
3 Respiratory system
4 Digestive system
5 Muscular System
6 Skeleton system
7 Reproductive system
8 Endocrine system
9 Lymphatic system
10 Immune system
11 Excretory system
12 Integumentry system
13 Special senses.

1. Nervous system :-

The Nervous System consist of brain spinal cord and nerves. Nerves is divided into two groups that is central nervous system (CNS) and peripheral nervous system( PNS).
Functions of nervous system:-
1.Control the function of body.
2. Transfer the messages.
3. Coordination and communication between the body parts.

2. Circulatory system :-

Circulatory system is also known as cardiovascular system or vascular system. It consists of the heart blood vessels arteries and veins.
Function of cardiovascular system :-
1. Pumping action of heart.
2. Transfer the nutrients harmone and oxygen.
3. Regulation of blood circulation.

3. Digestive system:-

Digestive system consist of number of organs like mouth, slavery glands, oesophagus, stomach, small intestine , large intestine and accessory organs like liver, gallbladder, pancreas extra.
Function of digestive system:-
1. Ingestion of food.
2. Propulsion of food.
3. Digestion of food.
4. Absorption of food.
5.Elimination.

4  The respiratory system :-

The respiratory system consist of nasal cavity, trachea, bronchus ,lungs and alveolars.
Function of respiratory system:-
1. Help in respiration.
2. Exchange of gases and purification of blood.

5. The excretory system :-

The excretory system is also known as urinary system. It consists of Kidneys ,ureter ,bladder and urethra.
Function of excretory system:-
1. Maintenance of hormones water and electrolytes in body.
2. Removal of waster products from body.
3. Formation of urine and secretion of hormones hormones.

6. Ingumentry system :-

It consists skin and their layers. skin having three layers epidermis ,dermis and hypodermis.

Function of ingumentry system:-
1. Protection of body.
2. Sensory perception.
3. Regulation of body temperature.

7. skeleton system :-

It deals with bones. skeleton system is divided into two types of skeleton system that is axial skeleton system and appendicular skeleton system.
Function of skeleton system :-
1. Provide framework to the body.
2. Give support to the muscles and organ.

8. Lymphatic system :-

It consists of lymph, lymph vessels, lymph nodes and organs that are spleen and thymus.
Function of lymphatic system :-
1. Tissue drainage.
2. Maintenance of blood volume.
3. Immunity.

9. Endocrine system:-

It consists of glands that are pituitary gland , posterior pituitary gland, thyroid gland ,parathyroid gland etc. These glands produce hormones which help in various function of body.
Function:-
1. Release the hormone .
2 Growth and development.
3. Regulate metabolism.

10. Reproductive system:-

It is divided into two groups that are male reproductive system and female reproductive. The female reproductive system consists of Fallopian tube ,uterus, ovaries vagina . The male reproductive organ consists of testes, prostate, penis ,seminal vesicles.

Function:-
1. Sexually function.
2. Produce new one.

11. Muscular System:-

It consists of different types of muscles having different work in body that our skeletal muscles, smooth muscles ,cardiac muscles etc.
Function :–
1. Provide support to the organ.
2. Help in movement.

12. Immune system:-

It it helps the body to prevent from illness and fight against pathogens.
Function:-
1. Resistance to infection and toxin.
2. Reduce risk of illness.

13. The special senses:-

The special senses are eyes ,nose, ear,skin and tongue.
Function :-
1. The function of eye is sigh (vision).
2. The function of ear is hearing.
3. The function of tongue is taste.
4. The function of skin is touch.
5. The function of nose is olfactory (smell).