Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Muscles chapter 6
Muscles
| Question | Answer |
|---|---|
| contractility | The ability of skeletal muscle to shorten with force |
| Excitability | capacity of skeletal muscle to respond to a stimulus |
| Extensibility | Ability to be stretched |
| Muscle fiber | muscle cell |
| Epimysium | Each skeletal muscle surrounded by connective tissue sheath |
| Fascia | Another connective tissue located outside the epimysium |
| Fascia | surrounds and separates muscles |
| Fasciculi | muscle that is composed of numerous visible bundles |
| perimysium | Fasciculi is surrounded by loose connective tissue |
| Actin myofilaments | thin Myofilaments, which resemble 2 minute strands of pearls twisted together |
| Myosin myofilaments | thick Myofilaments, which resemble bundles of golf clubs |
| Sarcomeres | Actin and Myosin Myofilaments form highly ordered units |
| Sarcomeres | which are joined end to end to form myofibril |
| sarcomere | basic structural and functional unity |
| sarcomere | each one extends from one Z line to another Z line. Each Z line is an attachment site for actin |
| resting membrane potential | outside of most cell membranes is positively charged compared to the inside of the cell membrane, which is negatively the charge difference across the membrane |
| action potential | when muscle cell is stimulated the membrane characteristics change briefly, the brief reversal back of charge |
| motor neurons | nerve cells that carry action potentials to skeletal muscle fibers |
| neuromuscular junction | axons enter the muscle and branch. Each branch that connects to the muscle |
| motor unit | single motor neuron and all skeletal muscle fibers it innervates |
| presynaptic terminal | enlarged nerve terminal |
| synaptic cleft | space between presynaptic terminal and muscle cell |
| postsynaptic terminal | the muscle fiber in it |
| Synaptic vessels | each presynaptic vessel contains it |
| acetylocholine | secrete a neurotransmitter |
| acetylocholine | diffuses across synaptic cleft and binds to the postsynaptic terminal causing a change in postsynaptic cell |
| sliding filament mechanism | sliding of actin myofilaments past myofilaments during contraction |
| muscle twitch | contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers |
| threshold | muscle fiber will not respond to stimulus until the stimulus reaches a level |
| lag phase | time between application of a stimulus to a motor neuron and beginning of contraction |
| contraction phase | time of contraction is |
| relaxation phase | time during which the muscle relaxes |
| Tetany | where the muscle remains contracted without relaxing |
| recruitment | increase of number of motor units being activated |
| ATP(adensosine triphosphate) | is needed for energy for muscle |
| ATP | produced in the mitochondria |
| Creatine phosphate | When rest they cant stockpile ATP but they can store another high end molecule |
| Anaerobic respiration | without oxygen |
| Aerobic respiration | with oxygen(more efficient) |
| muscle fatigue | results of ATP is used during muscle contraction faster than it can be produced in muscle cells |
| Isometric | the length of the muscle does not change, but the amount of tension increases during the contraction process |
| isotonic | the amount of tension produced by muscle is constant during contraction but the length of the muscle changes |
| muscle tone | muscle tone refers to constant tension produced by muscles of the body for long periods of time keeps head and back straight |
| Fast-twitch fibers | contract quickly and fatigue quickly well adapted to perform anaerobic metabolism |
| slow twitch fibers | contract more slowly and is more resistant to fatigue, they are better suited for aerobic metabolism |
| origin(head) | is the most stationary end of the muscle |
| Insertion | end of the muscle undergoing the greatest movement |
| belly | portion of muscle between the origin and insertion |
| Synergist | muscles that work together to accomplish specific movements |
| antagonist | muscles that work in opposition to one another |
| occipitofrontalis | raises the eyebrows |
| Orbicularis oculi | closes the eyelids and causes crows feet, wrinkles skin at lateral corners of eyes |
| orbicularis oris | puckers the lips |
| Buccinator | Flattens cheeks, Trumpeters muscle |
| Zygomaticus | smiling muscle |
| Levatator Labii superioris | sneering |
| Depressor anguli oris | frowning |
| Mastification | chewing |
| Intrinsic Tongue Muscle | change the shape of tongue |
| Extrinsic Tongue Muscle | Move the Tongue |
| Sternocleidmastoid | lateral neck muscle and prime mover, rotates and abducts the head |
| Platysma | sheetlike muscle that covers the anterolateral neck, pulls the corners of mouth inferiorly |
| Erector spinae | group of muscles on each side of the back. Responsible for keeping the back straight and body erect |
| External intercostals | elevate the ribs during inspiration |
| Internal intercostals | contract during forced expiration |
| Diaphram | accomplishes quiet breathing |
| Trapezius | Rotates scapula |
| serratus anterior | pulls scapula anterior |
| Pectoralis Major | adducts and flexes arm |
| Triceps brachii | extends the forearm |
| Biceps brachii | flexes the forearm |
| Brachialis | flexes forearm |
| Brachioradialis | flexes and supinates the forearm |
| flexor carpi | flexes wrist |
| extensor carpi | extends the wrist |
| flexor digitorium | flexes the fingers |
Created by:
Kbrumfield
Popular Anatomy sets