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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 |