Mr. G’s Muscles
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each of the black spaces below before clicking
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| What are muscles? | Bundles of muscle fibers held together by connective tissue
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| Excitability | Respond to a stimulus
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| Extensibility | The ability to be stretched
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| Contractibility | Muscle fibers when stimulated will contract or become short and thick, this results in movement
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| Elasticity | After contracting this trait allows the muscle to return to its original shape
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| The three types of muscle tissue are | cardiac, visceral or smooth and skeletal or voluntary
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| Cardiac muscle | Forms the walls of the heart and contracts to circulate blood
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| Visceral or smooth muscle | Found in internal organs of the body i.e. digestive, respiratory, blood vessels, eye and urinary system organs. These muscles contract without conscious thought and are called involuntary muscles.
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| Skeletal muscle | Attached to bones and causes body movement. Can be controlled and are called voluntary muscle.
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| Functions of muscles | Attach to bones to provide voluntary movement,
Produce heat and energy,
Help maintain posture and
Protect internal organs
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| Tendons | Strong,tough, connective-tissue cords that attach to bones.
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| Fascia | a tough, sheet like membrane that covers tissue
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| Origin | The attached point of a muscle to a bone that does not move.
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| Insertion | The attached point of the muscle that moves.
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| Adduction | Moving a body part toward midline
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| Abduction | Moving a body part away from midline
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| Flexion | Decreasing the angle between two bones, or bending a body part.
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| Extension | Increasing the angle between two bones, or straightening of a body part.
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| Rotation | Turning a body part around its own axis
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| Circumduction | Moving in a circle at a joint or moving one end of a body part in a circle while the other end remains stationary
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| Muscle tone | The state of partial contracture.State of readiness to act, partially contracted at all times
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| Contracture | A result of not using a muscle.
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| Atrophy | Shrinking in size because muscles weren't used for a long time
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| Myasthenia gravis | Chronic condition, nerve impulses not properly transmitted
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| Muscular dystrophy | Inherited disease leading to muscle atrophy
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| Muscle strain | Sudden, painful,involuntary muscle contraction
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| Muscle spasm | Outstretching or injury to a muscle or tendon
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Created by:
rotechams
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