HEALTH CLASS MUSCLE LECTURE NOTES
3 Types of Human Muscle
Cardiac
Smooth
Skeletal
Human heart/myocardia
Involuntary-Surrounds Organs/Veins
Voluntary-Connects and moves bones
Myofibrils
Muscle tissue is made up of
thousands of small muscle spindles
Muscle types / Colors
White
Red
Grey
Muscle Movements
Fast Twitch-Strength
Slow Twitch-Endurance
Combination of both
High level of Strength with some
Endurance
Contraction:
When muscles bring bones closer
together “Belly of muscles”
Extension:
When muscles move bones further
away “thinning of myofibrils”
Muscle Growth
Overload
Progression
Resistance
Regularity
Specificity
Recovery
Aerobic Exercise
Exercise where you CAN replace
oxygen faster than your muscles use it
Anaerobic Exercise
Exercise where you CAN NOT replace
oxygen faster than your muscles use it
Oxygen Debt
When your lungs DON’T move lactic
acid out of your body faster than it
builds it up
Lactic Acid
Waste product from muscles using
glucose and oxygen
Builds up in muscles
Too much lactic acid causes “Tetnae”
Lactic Acid leaves muscles though
blood stream to lungs,, exhale
Oxygen Debt
when you build up lactic acid
faster than you can get it out of
muscles
Muscle Warm Up
For maximum use muscles must have
continual oxygen flow through them
Capillaries are “collapsed” prior to
exercise- Vasoconstriction
Vasodilation of capillaries allows
a greater blood flow through to
bring more oxygen in and remove
Lactic Acid from
Cardiovascular Fitness
Heart and blood vessels
Cardio respiratory Fitness Heart and lungs
Muscle Cramps:
1.
2.
3.
Caused by 1 of 3 primary things
Lack of Oxygen in muscles
Muscles being bent
Dehydration-lack of water in tissue
Connective Tissues
Ligaments-connects bone to bone
Tendons-connects muscle to bone
Cartilage-used for spacers and shock
absorbers
Classes of Levers
FIRST DEGREEThe fulcrum lies between the power
point and the weight to be lifted
“tetertotter”
SECOND DEGREE
The weight is between the fulcrum and
Point at which pulls is exerted
“wheelbarrow”
THRID DEGREE
Power is exerted between fulcrum and
weight
“golf clubs or tennis rackets”
Muscle power at Optimum
The angle of the “pull” of any lever is
the factor that considers how strong
the muscle is
Optimum angle is 90 degrees
Greater or less levels decreases
strength
Striddes =- law of muscle movement
If a bone moves there has to be at least two muscles on opposite
sides. Bicep and tricep
Bicep flexes the fore arem
Tricep extends the fore arm