1. Senses

2. Senses Vision Hearing Retina has specialized cells for sight
Rods detect light
Cones detect color
Lens focuses images on retina
Iris controls amount of light entering the eye
Hearing
Ear collects sound waves that stimulate hair cells (NOT hair) in the ear. Hair cells stimulate nerves, brain interprets sounds.

3. Senses (cont.) Smell and Taste Touch
Both have cells that detect chemicals.
Smell detects odors
Taste detects flavor
Smell heavily influences taste
Touch
Skin has cells that detect pressure, temperature, and pain

5. Digestive System

6. Parts of the Digestive System
Mouth
Esophagus
Stomach
Small and large intestine
Liver & Gallbladder
Pancreas

7. Functions of the Digestive System
Breaks down and absorbs nutrients, salts, and water.
Eliminates solid waste (feces)

8. Cool Digestive System Facts
The average liver weighs about 3 pounds.
The large intestine is home to about 100 trillion bacteria.
The iron in a human could make a small nail.
There is enough phosphorus in the human body to make 2,000 match tips.

9. Urinary System Structures: Kidneys, ureters, bladder
Function: eliminates non-solid waste through urine.
Waste includes water, salt, urea, minerals, and vitamins

11. Skeletal System

12. Structure of the Skeletal System
Includes
Bones
Cartilage (found between bones, cushions)
Ligaments (connects bones)

13. Functions Movement Supports and protects vital organs
Blood Cell Production
Stores Minerals

14. Muscular System

15. Organs of the Muscular System
Cardiac, skeletal, and smooth muscle
Tendons (attach muscle to bone)

16. Functions of Muscle
Movement (circulate blood, move food through digestive system, move bones at joints)
Produce body heat
Maintain posture
Stabilize joints

17. Super Interesting Muscle Facts
You have more than 600 skeletal muscles.
40 muscles are used to frown, 20 to smile.
The gluteus maximus is
the largest muscle.