1. Integumentary System Major Organs:
Skin, hair, nails, sweat and oil glands
Functions:
Barrier against infection and injury
Helps regulate body temperature
Provides protection against UV radiation

2. Nervous System Major Organs: Brain, spinal cord, nerves Functions:
Gathers and interprets information
Responds to information

3. Circulatory System Major Organs: Heart, veins, arteries, blood
Functions:
Bring oxygen, nutrients, and hormones to cells
Remove cell wastes
Helps to regulate body temperature

4. Skeletal System Major Organs: Bones, cartilage, ligaments, tendons
Functions:
Protects organs
Provides shape and support
Allows movement
Produces blood cells and stores minerals

5. Muscular System Major Organs:
Cardiac muscle, smooth muscle, skeletal muscle
Functions:
Allows for movement by contraction
Helps circulate blood and move food through the digestive system

6. Digestive System Major Organs:
Mouth, esophagus, stomach, small/large intestines, rectum
Functions:
Take in food (ingestion)
Digest food into smaller molecules that can be absorbed and used by cells
Eliminate waste

7. Lymphatic/Immune System
Major Organs:
White blood cells, thymus, spleen, lymph nodes, lymph vessels
Functions:
Helps protect the body from disease
Collects fluid lost from blood vessels and returns it to the circulatory system

8. Endocrine System Major Organs:
Hypothalamus, pituitary, thyroid, pancreas, ovaries, testes
Functions:
Regulate body activities using hormones
Controls growth, development, and metabolism
Maintains homeostasis

9. Respiratory System Major Organs:
Nose, pharynx, larynx, trachea, bronchi, bronchioles, lungs
Functions:
Takes in oxygen and removes carbon dioxide from the body

10. Excretory System Major Organs:
Skin (sweat glands), kidneys, ureters, bladder, urethra
Functions:
- Remove waste products from the body (urea, water, CO2)

11. Reproductive System Main Organs: Females – ovaries and vagina
Males – testes and penis
Functions:
Produces reproductive cells
In females: nurtures and protects developing embryo