The document summarizes the 12 major systems of the human body. It lists each system and provides 1-2 sentences about their main functions. The systems are: 1) digestive, 2) circulatory, 3) nervous, 4) excretory, 5) respiratory, 6) skeletal, 7) muscular, 8) endocrine, 9) immune, 10) integumentary, 11) lymphatic, and 12) reproductive. Each system works with organs to perform important tasks that support life and homeostasis.

1. Systems of Human body
Presented by,
K. Sai lakshmi
B-pharmacy
Balaji college of pharmacy

2. Definition:
Body systems are groups of organs and tissues that
work together to perform important jobs for the body. Some
organs may be part of more than one body system if they serve
more than one function
The human body consists of twelve organ systems, each
of which contains several functions and specific organs.

3. 1. Digestive system
2. Circulatory system
3. Nervous system
4. Excretory system
5. Respiratory system
6. Skeletal system
7. Muscular system
8. Endocrine system
9. Immune system
10. Integumentary system
11. Lymphatic system
12. Reproductive system

4. 1. Digestive system

5. Functions of Digestive system
 Ingestion of food.
 Digest food into smaller molecules and absorb nutrients.
 Remove undigestible food from body (feces).
Major organs:
 Mouth
 Esophagus
 Stomach
 Small Intestine
 Large intestine
 Rectum
 anus
 Salivary glands
 Pancreas
 Liver and
 gall bladder

6. 2. Circulatory system

7. Functions:
 Transport oxygen and nutrients to and from cells/tissues.
 Remove waste products.
Major organs:
 Heart
 Veins
 Arteries
 Capillaries
 Red blood cells

8. 3. Nervous system

9. Functions:
 Gathers and interprets information
 Responds to information
 Helps maintain homeostasis
 Coordinates activities of other organ systems
Major organs:
 Brain
 Spinal cord
 Nerves
 Eyes
 Ears

10. 4. Excretory system

11. Functions:
 Removes waste products from cellular metabolism(urea,water,CO2)
 Regulates pH and volume of blood.
 Filters blood
Major organs:
 Kidneys
 Ureters
 Bladder
 Urethra

12. 5. Respiratory system

13. Functions:
 Exchange of gases(oxygen and carbon dioxide)
 Removes water
Major organs:
 Nose
 Trachea
 Bronchi
 Bronchioles
 Alveoli
 Lungs

14. 6. Skeletal system

15. Functions:
 Protects Organs
 Provides Shape, Support
 Stores Materials (Fats, Minerals)
 Produces Blood Cells
 Allows Movement
Major Organs:
 Bones
 Cartilage
 Ligaments
 Bone marrow

16. 7. Muscular system

17. Functions:
 Allows for movement by contracting
 Locomotion
 Heat production
Major organs:
 Cardiac muscle
 Smooth muscle
 Skeletal muscle
 Tendons

18. 8. Endocrine system

19. Functions:
 Regulates body activities using hormones.
 Slow response, long lasting
Major organs:
 Hypothalamus gland
 Pituitary gland
 Thyroid gland
 Thymus gland
 Adrenal gland
 Pancreas
 Ovaries
 Testes

20. 9. Immune system

21. Functions:
 Fights off foreign invaders in the body
Major organs:
 White Blood Cells
T cells
B cells
-produce antibodies
 Macrophages

22. 10. Integumentary system

23. Functions:
 Barrier against infection
 Helps regulate body temperature
 Removes excretory waste(urea, water)
 Protects against sun’s uv rays
 Produces vitamin D
Major organs:
Skin
 Epidermis
 Dermis
 Sweat gland
 Sebaceous gland (oil)
 Hair follicle
 Blood vessels
 Nerves

24. 11. Lymphatic system

25. Functions:
 Stores and carries WBC’s that fight disease.
 Collects excess fluid and returns it to blood (2nd circulatory system-
reaches places other one can’t between cells).
Major organs:
 Lymph
 Lymph vessels
 Lymph nodes
 Spleen
 Thymus

26. 12. Reproductive system

27. Functions:
 Produce germ cells(eggs & sperms)
 Environmental for growth of fetus(female)
Major organs:
 Ovaries
 Uterus
 Mammary glands
 Testis
 Prostate glands
 External genitalia