Introduction to Human Body

Updated 29 Nov, 2025

Read time 2 min

Definition and scope of anatomy and physiology, levels of structural organization and body systems, basic life processes, homeostasis, and basic anatomical terminology.

 

It is defined as it is the study of structure and functions of human body.

Anatomy

It is the branch of science which deal with the study of structure of different organs of human body. eg. Histology (Study about tissue)

Physiology

It is the branch of science which deal with the study of functions of different organs of human body. eg. Neurophysiology [study about Neurons]

 

It is about, what we can do from Anatomy & Physiology.

- Study of structure and function of body parts.

- Parameters of normal health such as temperature, pH, basic need etc...

- Pathology of disease

- Surgery Techniques

- Human evolution and development

eg. Histology - Study about tissue

 

Human body is a six-level organised structure.

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  1. Molecular/Chemical level - It is the most basic level, two or more atom/molecule joined together to form cells. eg. Oxygen (O), Carbon (C), Hydrogen (H) etc...

2. Cellular level - It is the basic structural and functional level of body. eg. cell two or more cells joined together to form tissue.

3. Tissue level - These are the group of cells which works together to perform a particular functions. eg. skin

4. Organ level - In this, different-2 types of tissue combine together to form organs which do proper functioning of body. eg. Heart, Lungs, Kidney etc...

5. System level - In this, A group of organs combine together to form system. eg. Digestive System, Respiratory System, Cardiovascular System etc...

6. Organism level - It is the highest level and a complete body made up with combined of all system. eg. Human Body.

 

A system is a group of organs, which combined together to perform proper functioning.

- There are total II system in human body :-

  • Nervous System

  • Respiratory System

  • Cardiovascular System

  • Digestive System

  • Urinary System

  • Reproduction System

  • Integumetry System

  • Muscular System

  • Skeletal System

  • Lymphatic System

  • Endocrine System