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Muscle
MUSCLE IS IMPORTANT TO OUR BODY!!
Survival depends on movement 40-50 % of body weight.
Why muscle is important?
A facial expression results from one or more motions or positions of the muscles of the face.
Orbicularis Oculi :Blinking
Orbicularis Oris:Kissing
Mastication :Chewing
Zygomaticus Major:Laughing
Muscles must pull backwards and upwards on the trunk and head Muscles have tonicity, or muscle tone, which is the continuous, low level of sustained contraction maintained by all skeletal muscles Poor posture puts a strain on ligaments.
Posture
Arm and Wrist Movement
Pectoralis Major: Flexes upper arm Latissimus Dorsi: Extends upper arm Flexor carpi radialis: Flexes hand Extensor Carpi: Extends hand Flexor: Digitorum: Flexes Fingers
First-Class Levers: Fulcrum lies between the effort or pull, and resistance or load Example- head being raised or tipped backwards Second-Class Levers: Load lies between fulcrum and joint at which pull is exerted Example- rising up on toes (tip-toe) Third-Class Levers: Pull is exerted between fulcrum and resistance or load to be moved Example- Flexing forearm at elbow joint
Levers allow for movement
