MMHS Anatomy and Physiology. 600 muscles in the human body 600 muscles in the human body Makes up 40% of the body weight Makes up 40% of the body weight.

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Presentation transcript:

MMHS Anatomy and Physiology

600 muscles in the human body 600 muscles in the human body Makes up 40% of the body weight Makes up 40% of the body weight 3 main types that make up the human body 3 main types that make up the human body Viewed as “the machines” of the body Viewed as “the machines” of the body Prefixes associated with muscles Prefixes associated with muscles myo- and mys- = “muscle” Sarco = “Flesh” Globin = “protein”

Muscles can only contract or shorten. Muscles can’t PUSH, they only PULL. Muscle occur in opposing pairs. Prime Mover: Prime Mover: causes the main movement. Antagonist: Antagonist: opposes or reverses a movement. Example : biceps brachii triceps brachii. Example : The Prime Mover is the biceps brachii and the Antagonist is the triceps brachii. Body building adds very little new muscle but instead adds filaments and fluid. (these additions make muscles work more efficiently).

1. Skeletal or Striated Muscle a) Long and cylindrical with many nuclei (=multinucleate) b) Under both Voluntary and Involuntary Movement Tendons attach muscle to bone at 2 points. a) Origin: a) Origin: stationary muscle point (anchor) b) Insertion b) Insertion: movable attachment point Skeletal Muscles occur in pairs that have opposing motion. a) Flexors: a) Flexors: decrease the angle between parts. b) Extensors: b) Extensors: increase the angle between parts. Example Example: The biceps brachii is the flexor and the triceps brachii is the extensor.

4 Main Properties of Skeletal Muscles shorten with force. 1. Contractibility: shorten with force. will return to its original form. 2. Elasticity: will return to its original form. responds to a stimulus (nerve) 3. Excitability: responds to a stimulus (nerve) can be stretched. 4. Extensibility: can be stretched.

2. Smooth Muscle a. Spindle-shaped with 1 nucleus (uninucleate) b. Involuntary Movement c. Located in digestive, urinary tracts, and vascular system. Peristalsis: the term for the rhythmic, synchronized contraction of smooth muscle.

3. Cardiac or Myocardium a) Found only in heart tissue. b) Striated with 1 nucleus and intercalated discs. c) Involuntary (about 86,400 beats/day) d) Pacemakers (SA node of right atrium) artificially controls the rhythm of the heart.

YOGA

Capoeira

Surfing

Climbing