WHy exercise is importantExercise for 30 min to an hour 3 times per week. High energy exercise that make your heart rate rise. There is strength training and there is cardio Vocabulary Joint: a place of your body where two or more of your bones come together Cartilage: tough supportive tissue that is more flexible than bone Ossification: the process of replacing cartilage with bone Marrow: fills the spaces in bones, there is red and yellow marrow, red bone marrow produces 100 billion blood cells each day, yellow marrow is in the hollow centers of long bones and stores fat Ligaments: hold bones together Osteoporosis: a medical condition in which the bones become brittle and fragile from loss of tissue, typically as a result of hormonal changes, or deficiency of calcium or vitamin D. 
Fracture: break in bone, simple fracture: bone broken in two, compound fracture: broken ends of the bone pierce the skin Sprain: overstretched or torn ligament, treated with ice and stabilization, you are likely to have swelling but it can heal on its own Dislocation: ends of the bone are forced out of their original position, to treat this the bone is put back in place and stabilized with cast or bandage Torn Cartilage: serious damage to cartilage between bones, happens in knees often Overuse Injuries: when an activity is performed too often and joint become stressed or inflamed.
Muscle BuildingTypes of muscle Smooth muscle: involuntary muscle that causes movements within your body, found in walls of esophagus to move food down and in walls of arteries Cardiac muscle: involuntary muscle that is only in the heart Skeletal muscles: muscles that control your activities Don't take steroids CoordinationMuscles connect to nervesNervous system: receives information about what is going on inside and outside your body Neuron: type of cell Cell Body: the cell body controls the cell's basic functions Myelin sheath: increases the speed of an impulse Axon: impulses travel along axons to other cells Dendrite: carry nerve impulses toward a neuron's cell body Synapse: the junction between an axon and another cell    Components of nervous SystemCerebrum: 85 percent of the brain's weight Cerebellum: coordinates body movement Brain Stem: between cerebellum and spinal cord, midbrain, pons and medulla Spinal Cord: a thick column of nerve tissue that links the brain to most of the nerves in the peripheral nervous system Reflexes: automatic response to your environment Peripheral Nervous System: carries information to the central nervous system from eyes, ear and sense organs Sensory Division: carry information about your outside environment Motor Division: carries responses back to your muscles and glands Somatic nervous system: carry signals that control voluntary actions such as chewing food Autonomic nervous system: regulates actions that happen automatically, like breathing and digestion Severe INJURIESConcussion: bruise like injury Contusion: swelling in brain Coma: severe trauma, long period of unconsciousness Paralysis: loss of ability to move Traumatic brain injury (TBI): is a sudden injury that causes damage to the brain Epilepsy and Seizures are Frequently Caused by a Traumatic Brain Injury. injuries may be connected to meningitis
Safe ExercisesSetting goals
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