1. An overview of the human body systems
Human Anatomy
An overview of the human body systems

2. Anatomy
Anatomy is the scientific discipline that investigates the body’s structure.
It examines the relationship between the structure of a body part and its function.

3. Levels of organization
Chemical level
Cell level
Tissue level
Organ level
Organ system level
Organism level

4. Chemical level Smallest level of organization.
It involves atoms & molecules.

5. Cell level
This level involves cells (basic units of all living things) & their organelles.

6. Tissue level
A tissue is a group of similar cells & materials surrounding them.
Examples: heart tissue, muscle tissue

7. Organ level
An organ is composed of 2 or more tissue types that perform one or more common functions.
Examples: heart, lungs

8. Organ system level
A group of organs that have a common function or set of functions & are therefore viewed as a unit.
Examples: digestive system, nervous system

9. Organism level
An organism is any living thing considered as a whole, whether composed of one cell or trillions of cells.
Examples: bacterium, human

10. Integumentary system Organs of the integumentary system: Skin
Accessory structures—hair, nails & sweat glands

11. Integumentary system

12. Integumentary system
This system, in particular the skin, forms a protective barrier around the body.
The skin also helps prevent water loss & control body temperature.

13. Integumentary system
The skin also gathers information about the surroundings.

14. Skeletal system – Organs
Bones
Cartilage
Tendons
Ligaments

15. Skeletal system

16. Skeletal system This system… Helps you move.
Protects your internal organs.
Gives your body shape & support.
Stores minerals.
Produces blood cells.

17. Muscular system – Organs
Muscles
Skeletal (voluntary movement)
Smooth (involuntary movement)
Cardiac (involuntary movement)

18. Muscular system

19. Muscular system
This system is responsible for voluntary movements (I.e., jumping & pointing) and involuntary movements (I.e., beating of your heart and the churning of your stomach).

20. Nervous system – Organs
Brain
Spinal cord
Nerves
Sensory receptors

21. Nervous system

22. Nervous system
This system detects changes outside and inside the body and controls the way the body responds to these changes.

23. Endocrine system – Organs
Pituitary gland
Hypothalamus gland
Thyroid gland
Parathyroid glands
Adrenal glands
Pancreas
Pineal body
Thymus
Ovaries
Testes

24. Endocrine system

25. Endocrine system
This system produces chemical messengers called hormones.
Some hormones help to maintain homeostasis.
Other hormones control development & growth.

26. Circulatory system– Organs
Heart
Blood
Blood vessels—veins & arteries

27. Heart

28. Circulatory system

29. Circulatory system
This system transports oxygen and nutrients to the cells and carries wastes away from cells.

30. Lymphatic system – Organs
Lymphatic vessels
Lymph nodes
Lymph
Lymphocytes
Spleen
Tonsils

31. Lymphatic system

32. Lymphatic system
This system takes fluid from the spaces between cells and returns it to the circulatory system.
It also filters bacteria and other microorganisms from this fluid.

33. Immune system
The immune system is a functional system rather than an organ system in an anatomical sense.
Certain organs of the body (lymphatic & circulatory systems) are intimately involved with the immune response.

34. Immune system

35. Immune system
This system protects the body from infection.

36. Respiratory system–Organs
Nasal cavity
Pharynx
Trachea
Bronchi
Lungs

37. Respiratory system

38. Respiratory system
This system moves oxygen into the body and carbon dioxide out of the body.

39. Digestive system – Organs
Gastrointestinal tract—mouth, esophagus, stomach, small intestine & large intestine
Accessory organs—liver, gallbladder & pancreas

40. Digestive system

41. Digestive system
This system digests (breaks down) food and absorbs nutrients.

42. Excretory system – Organs
Kidneys
Ureters
Bladder
Urethra

43. Excretory system

44. Excretory system
This system removes wastes from the body & helps maintain homeostasis.

45. Reproductive system–Organs
Testes
Epididymis
Vas deferens
Seminal vesicles
Prostate gland
Cowper’s glands
Urethra
Penis

46. Reproductive system–Organs
External parts:
Vulva
Labia majora
Labia minora
Internal parts:
Ovaries
Fallopian tubes
Uterus
Vagina

47. Female reproductive system
                                
Female reproductive system

48. Male reproductive system
                                
Male reproductive system

49. Reproductive system In males, this system produces sperm.
In females, this system produces eggs.