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GCSM-Myology
| Question | Answer |
|---|---|
| Myology | Study of muscles |
| Muscles make up how much of the bodies weight | 40-60% |
| How many muscles are in the body? | over 600 |
| Functions of Muscles | locomotion, motor functions, shapes and supports the skeleton, body temperature |
| Myology | Study of muscles |
| Muscles make up how much of the bodies weight | 40-60% |
| How many muscles are in the body? | over 600 |
| Functions of Muscles | locomotion, motor functions, shaes and supports the skeleton |
| Types of muscles | Skeletal (voluntary), Smooth (involuntary or viseral), Cardiac (involuntary) |
| Skeletal Muscles | move by will, many striations, fastens to bone, skin & other muscles, controlled by CNS |
| Smooth (Involuntary or Viseral) | found in walls of stomach, intestines, blood vessels, controlled by ANS, spindle shaped cell w/ one nucleus |
| Cardiac (Involuntary) | some striations, heart only, specialized ANS |
| Characteristics of muscles | irritability, contractability, elasticity, extensibility |
| Irritabilty | reaction to any form of stimuli |
| Contractability | ability of a muscle to contract |
| Elasticity | ability to maintain original shape after stretching |
| Extensibility | ability to stretch |
| Muscle tissue | contractile fibers arranged in seperate parallel bundles (fascicles) |
| Connective tissue | forms a continuous frame-like network throughout the body |
| Epimysium | outer most layer; covering of an individual muscle |
| Fascicles | warm like structures that extend the length of muscles |
| Perimysium | seperates the muscle into bundles of muscle fibers |
| Endomysium | inner most layers, inside the fascile, covers each muscle fiber |
| Myofibrils | smallest, make up muscle fibers, surrounded by sarcolemma contains actin & myosen |
| Actin & Myosin | Proteins that work together to create striations |
| Actin (in muscle) | allows for contraction |
| Myosin | interacts with it to contract |
| Adenosine Triphosphate | energy comes from a breakdown of this molecule |
| Adenosine diphosphate | formed when ATP molecule is broken down thereby releasing energy |
| Origin | immovable section of skeleton where muscle is anchored |
| Insertion | where movement takes place |
| Isometric contraction | when muscle contracts and the ends of the body parts that are affected DO NOT MOVE |
| Isotonic Contraction | the distance btwn the ends of the muscles change |
| 2 Types of Isotonic Contraction | Concentric and Eccentric |
| Concentric Contraction | distance decreases |
| Eccentric Contraction | distance increases |
| Agonist | main muscle causing the action |
| Antagonist | opposing muscle that acts the opposite |
| Synergist | musle that assists other muscles |
| Fixator | allow for weight bearing functions |
| Flexion | contraction of muscle ,decrease the angle |
| Extension | increase angle |
| Abduction | take away from trunk |
| Adduction | move towards the trunk |
| Rotation | twisting |
| Dorisflexion | toes up |
| Plantar Flexion | toes down |
| Pronation | palms down |
| Supination | palms up |
| Muscle Spasms | sudden involuntary muscle contraction of a muscle or group of muscles |
| Muscle Strains | Class 1/Mild; Class2/Moderate; Class 3/Severe |
| Class 1/ Mild Strain | stretched |
| Class 2/Moderate Strain | partially torn |
| Class 3/ Severe Strain | complete tear |
| Hypertrophy | enlargement of muscel due to repeated forceful activity |
| Atrophy | muscle degeneration |
| Tendonitis | inflammation of the tendons |
| Hypertonia | increased muscle tone |
| Hypotonia | decreased muscle tone |