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Anatomy1234
Mrs Eastham
| Question | Answer |
|---|---|
| contractility | ability to shorten w/ force |
| excitability | ability to respond to stimulus |
| extensibility | ability to be stretched |
| elasticity | ability to recoil after being stretched |
| epimysium | connective tissue sheath that surrounds skeletal muscle |
| fascia | connective tissue that is outside the epimysium that separates muscles |
| what do muscles do that are essential to the body's maintenance? | produce heat |
| fasciculi | numerous visible bundles of muscle |
| perimysium | loose connective tissue that surrounds the fasciculi |
| what are fasciculi composed of? | single muscle cells called muscle fibers |
| epomysium | surrounds each muscle fiber |
| myofibrils | threadlike structure that extends from one end of the fiber to the other |
| actin myofilaments | thin myofilaments(looks like pearls twisted together) |
| myosin myofilaments | thick myofilaments(looks like mini golf clubs) |
| sarcomeres | join end to end to form myofibril |
| what is on each side of the Z line? | I bands: which consists of actin |
| what does the H zone consist of? | myosin ONLY |
| What is the charge difference between membranes called? | resting membrane potential |
| what is action potential? | the reverse act to stimulus |
| motor neurons | nerve cells that carry action potential to skeletal muscle fibers |
| neuromusclular junction | axons that branch into the muscle and connect |
| motor unit | single motor neuron and all skeletal muscle innervates |
| what is the name of the two muscles on the arm | bicep and tricep |
| what is the major muscle in your leg | calve muscle |
| actin and myosin myofilaments slide past one another | muscle contraction |
| sliding filament mechanism | sliding of actin and myosin |
| H and I bands shorten but which one doesnt | A band |
| muscle twitch | a contraction |
| threshold | muscle fiber stimulus |
| all or none response | maximum contraction |
| lag phase | time between stimulus and contraction |
| contraction phase | time of the contraction |
| relaxation phase | time when muscle relaxes |
| tetany | where muscles stay contracted |
| recruitment | the increase in number of motor units |
| atp | adenosine triphosphate |
| atp is produced where | mitochondria |
| atp is what? | short-lived and unstable |
| creatine phosphate | storeable energy |
| anaerobic respiration | without oxygen |
| aerobic respiration | with oxygen |
| muscle fatigue | results when atp is used faster than it can be reproduced in contraction |
| isometric contraction | the amount of tension increases |
| isotonic conrtaction | the tension is constant but the length of the muscle changes during contraction |
| muscle tone | constant tension produced by muscles |
| fast-twitch fibers | contract quickly and fatigue quickly |
| slow-twitch | contract slowly and don't fatigue |
| origin | stationary end of muscle |
| insertion | the end of the muscle undergoing the most movement |
Created by:
living_old_man
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