2. Tissues –Group of cells with a common structure and function –Types Epithelial- Lines body surfaces; protection and prevents dehydration Nervous- nerve cells; body communication Connective- support, connect, and insulate; fat, bone, tendons, blood… Muscle- enable movement; skeletal (conscious control), smooth (involuntary), cardiac (heart)

3. Organs Organs- 2 or more types of tissues together to perform a specific function. We will cover… –Nervous –Circulatory –Respiratory –Digestive –But there’s more!!!!!!

4. Nervous System Made of neurons –Nerve cells that transmit info through the body Structure Dendrites Cell Bodies Axons Myelin Sheath C B A

5. How the neurons work Transmit an electrical impulse through neuron Each neuron has a resting potential When neuron carries a charge it reverses its resting potential (called Action Potential)

6. How the neurons work (cont..) Electrical impulse goes through axon to end of neuron Where the neuron meets another cell is called a synapse There is a gap at the synapse To transmit the signal through the gap, the neuron releases neurotransmitters

7. Drugs Many drugs prevent the reuptake of neurotransmitters (which means there is more molecules in between neurons) = feeling good –Cocaine (dopamine), Prozac (seratonin) (many anti- depressants)… Some mimic neurotransmitters –Morphine, Codeine, Heroin (many pain killers)…. Some decrease neuron activity –Alcohol

8. Nervous System Organization -Interprets and processes info Central Nervous system Brain –Cerebrum, Cerebellum, Brainstem Spinal Cord 1 2 3

9. Peripheral Nervous System Motor nerves –Send command from CNS to muscles, etc. Sensory nerves –Send commands from skin, etc. to CNS

10. How your body basically works. So Nerves essentially carry electricity What happens when you get shocked? What happens to your muscles when shocked? When you think, electricity is made. The signal goes to your muscle, making it contract. What are your muscles connected to? Therefore….

11. Your major bones A B C D E F G H I J K L Skull Clavicle Scapula Humerus Radius Ulna “Carpals”” Femur Tibia Fibual Tarsals Ribs Sternum M Pelvic Girdle N Patella O

12. Knee Problems http://www.aclsolutions.com/anatomy.php http://health.allrefer.com/pictures- images/acl-injury.htmlhttp://health.allrefer.com/pictures- images/acl-injury.html