1. By Dr. Hesnaa Saeed AL-Mossawi
Organ systems By
Dr. Hesnaa Saeed AL-Mossawi

2. Nervous System Functions Main Parts Brain Nerves Spinal cord
regulates behavior
maintains homeostasis
regulates other organ systems controls sensory and motor functions
Main Parts
Brain
Nerves
Spinal cord

3. The nervous system is divided into two divisions:
The Central Nervous System (CNS)– Responsible for relaying messages, processing and analyzing information.
The Peripheral Nervous System – Receives information from the environment and relays commands from the CNS to the organs and glands

4. Integumentary (Skin) System
Function
1st line of defense against disease
Helps maintain body temperature
Keeps fluids inside
Works with the excretory and the immune system to help remove cellular waste and protect us from disease.
Main Parts
Skin
Sweat glands
Hair
nails

5. Skeletal System: Parts & Function
Main parts:
Bones
Cartilage
Connective Tissue
Function:
Helps support body parts
Helps support body during movement
Helps protect other major organs:
Skull protects the brain
Sternum and ribs protects the heart and lungs
Vertebra protect the spinal cord

6. Muscular System Function Helps in movement.
Moves materials through the body
Main parts
Muscles
Tendons
Ligaments
Muscles in organs
Skeletal – Attached to bones for voluntary actions and controlled by the central nervous system
Smooth – Found in the digestive tract and the blood vessels to move food and blood. Control involuntary actions
Cardiac – Heart muscle cells are involuntary

7. Circulatory (Cardiovascular) System
Function
Carries blood and nutrients to the cells of the body
Carries waste away from the cells, such as carbon dioxide.
Arteries help carry oxygenated blood away from the heart
Veins carry un-oxygenated blood toward the heart
Capillaries are tiny blood vessels that connect arteries and veins. Gas exchange takes place here.
Main Parts
Heart
Blood (made up of plasma, red blood cells, white blood cells & platelets)
Veins
Arteries

8. Respiratory System Function Breathe Sustain life Main parts
Puts oxygen into the body & removes Carbon dioxide
Breathe
Sustain life
Main parts
Lungs
Nasal passages
Throat
Nose

9. Digestive System Function
Takes food & breaks it down into nutrients the body needs
It provides nutrients to the body’s cells
Main parts:
Mouth
Stomach
Liver
Pancreas
Small intestines
Large intestines
Rectum

10. Endocrine System Functions
regulates body temperature, metabolism, development, and reproduction; maintains homeostasis; regulates other organ systems
Major Structures
hypothalamus
pituitary
pancreas
pineal
adrenal
thyroid
parathyroid
testes, and ovaries

11. Important Glands and Hormones of the Human Body
Function
Pineal
Melatonin
Controls sleep and wake cycle
Thyroid
Thyroxine
Controls appetite and metabolism
Adrenal
Adrenaline
Deals with stressful situations
Thymus
Thymosin
T-cell development (fight diseases)
Ovary
Estrogen
Female reproduction
Testis
Testosterone
Male reproduction

12. Excretory System Functions Main Parts Removes wastes from blood
Removes harmful substances from blood
Regulates body fluids
Main Parts
Kidneys
Urinary bladder

13. Immune System Functions Main Parts Fights off disease Lymph nodes
White blood cells
Skin

14. Reproductive System Functions Main Parts Produce offspring
Males- make sperm
Females- make eggs
Main Parts
Male
Penis
Testes
Female
Uterus
Ovary
Vagina