Science+9

10/1/09 Excretory System Excretion: the removal of waste from a livening thing. wastes produced in our body: co2 inorganic salts heat water nitrogen Organs; Lungs, Kidneys, Liver, Skin

9/24/09 Nervous System Central Nervous System


 * Brain- gets and sends signals around the body; Major Control Center of Body
 * Spinal Cord- is protected by spine; connects the Brain to rest of system

Peripheral Nervous System


 * Nerves- Travels through body;

Voluntary Actions
 * things you think about doing

Autonomic


 * things you do not think about.

Brain


 * most important thing in body
 * ported by skull and 3 layers of tissue

Cerebrum
 * two halves- right and left
 * right controls left side and left controls right side

Cerebellum
 * balance
 * muscle coordimatio