1. Integumentary System (Skin, Hair, Nails)
Function:
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Protects the body from external damage
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Regulates body temperature
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Prevents water loss
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Produces vitamin D
Main Organs:
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Skin
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Hair
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Nails
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Sweat and oil glands
2. Skeletal System (Bones, Joints, Cartilage)
Function:
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Provides structural support
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Protects internal organs
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Stores minerals like calcium
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Produces blood cells in the bone marrow
Main Organs:
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Bones (e.g., femur, skull)
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Joints
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Cartilage
3. Muscular System (Muscles, Tendons)
Function:
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Enables movement
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Maintains posture
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Produces heat
Main Organs:
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Skeletal muscles (e.g., biceps, quadriceps)
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Cardiac muscle (heart)
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Smooth muscles (digestive tract, blood vessels)
4. Nervous System (Brain, Spinal Cord, Nerves)
Function:
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Controls body functions and responses
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Transmits electrical signals
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Coordinates voluntary and involuntary actions
Main Organs:
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Brain
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Spinal cord
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Peripheral nerves
5. Endocrine System (Hormone-Secreting Glands)
Function:
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Regulates metabolism, growth, and reproduction through hormones
Main Organs:
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Pituitary gland
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Thyroid gland
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Adrenal glands
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Pancreas (insulin production)
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Ovaries/Testes
6. Cardiovascular System (Heart, Blood Vessels, Blood)
Function:
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Circulates blood, oxygen, and nutrients
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Removes waste products
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Regulates body temperature
Main Organs:
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Heart
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Arteries
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Veins
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Blood
7. Lymphatic/Immune System (Lymph Nodes, Spleen, White Blood Cells)
Function:
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Defends against infections and diseases
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Transports lymph fluid
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Removes excess fluids from tissues
Main Organs:
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Lymph nodes
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Spleen
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Thymus
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Bone marrow
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White blood cells
8. Respiratory System (Lungs, Airways)
Function:
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Provides oxygen to the body
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Removes carbon dioxide
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Assists in speech production
Main Organs:
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Lungs
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Trachea
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Bronchi
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Alveoli
9. Digestive System (Stomach, Intestines, Liver, Pancreas)
Function:
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Breaks down food for nutrient absorption
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Eliminates waste
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Produces digestive enzymes
Main Organs:
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Mouth
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Esophagus
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Stomach
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Small and large intestines
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Liver
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Pancreas
10. Urinary/Excretory System (Kidneys, Bladder)
Function:
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Filters waste from the blood
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Maintains fluid and electrolyte balance
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Regulates blood pressure
Main Organs:
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Kidneys
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Ureters
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Bladder
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Urethra
11. Reproductive System (Male & Female Organs)
Function:
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Produces offspring
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Regulates reproductive hormones
Main Organs (Male):
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Testes
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Prostate gland
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Penis
Main Organs (Female):
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Ovaries
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Uterus
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Fallopian tubes
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Vagina