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Muscles
Mr. G’s Muscles
| Question | Answer |
|---|---|
| What are muscles? | Bundles of muscle fibers held together by connective tissue |
| Excitability | Respond to a stimulus |
| Extensibility | The ability to be stretched |
| Contractibility | Muscle fibers when stimulated will contract or become short and thick, this results in movement |
| Elasticity | After contracting this trait allows the muscle to return to its original shape |
| The three types of muscle tissue are | cardiac, visceral or smooth and skeletal or voluntary |
| Cardiac muscle | Forms the walls of the heart and contracts to circulate blood |
| 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. |
| Skeletal muscle | Attached to bones and causes body movement. Can be controlled and are called voluntary muscle. |
| Functions of muscles | Attach to bones to provide voluntary movement, Produce heat and energy, Help maintain posture and Protect internal organs |
| Tendons | Strong,tough, connective-tissue cords that attach to bones. |
| Fascia | a tough, sheet like membrane that covers tissue |
| Origin | The attached point of a muscle to a bone that does not move. |
| Insertion | The attached point of the muscle that moves. |
| Adduction | Moving a body part toward midline |
| Abduction | Moving a body part away from midline |
| Flexion | Decreasing the angle between two bones, or bending a body part. |
| Extension | Increasing the angle between two bones, or straightening of a body part. |
| Rotation | Turning a body part around its own axis |
| 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 |
| Muscle tone | The state of partial contracture.State of readiness to act, partially contracted at all times |
| Contracture | A result of not using a muscle. |
| Atrophy | Shrinking in size because muscles weren't used for a long time |
| Myasthenia gravis | Chronic condition, nerve impulses not properly transmitted |
| Muscular dystrophy | Inherited disease leading to muscle atrophy |
| Muscle strain | Sudden, painful,involuntary muscle contraction |
| Muscle spasm | Outstretching or injury to a muscle or tendon |
Created by:
smnewman
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