75 Muscles Flash Cards
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| The ability of skeletal muscle to shorten with force. | Contractility
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| The capacity of skeletal muscle to respond to a stimulus. | Excitability
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| The ability to stretched. | Extensibility
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| The ability to recoil to their original resting length after they have been stretched. | Elasticity
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| Four Major Functional Characteristics | Contractility, Excitability, Extensibility, Elasticity
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| A connective tissue sheath that surrounds the skeletal muscle. | Epimysium
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| Is another connective tissue located outside the epimysium that surrounds and separates muscles. | Fascia
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| Loose connective tissue that surrounds muscle fasciculi. | Perimysium
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| The fasciculi are composed of single muscle cells called _______ | Fibers
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| Fibers are surrounded by a connective tissue sheath called _______ | Endomysium
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| The cytoplasm of each fiber is filled with ______ | Myofibrils
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| Myofibrils consist of 2 major kinds of protein fibers | Actin Myofilaments, Myosin Myofilaments
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| Thin myofilaments that resemble 2 minute strands of pearls twisted together. | Actin Myofilaments
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| Thick myofilaments that resemble bundles of minute golf | Myosin Myofilaments
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| Actin and myosin myofilaments form highly ordered units called _______ | Sarcomeres
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| The charge difference across the membrane. | Membrane Potential
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| The briefly reversal back of charge is called _______ | Action Potential
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| Nerve cells that carry action potentials to skeletal muscle fibers. | Motor Neurons
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| A branch that connects to the muscle. | Neuromuscluar Junction
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| A single motor neuron and all the skeletal muscle fibers it innervates are called _______ | Motor Unit
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| The space between the presynaptic terminal and muscle cell is the _________ | Synaptic Cleft
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| Enlarged nerve terminal. | Presynaptic Terminal
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| Each presynaptic terminal contains | Synaptic Vesicles
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| Synaptic vesicles secrete a neurotransmitter called _______ | Acetylcholine
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| The acetylcholine relased into the synaptic cleft between the neuron and musle cell is rapidly broken down by an enzymes. | Acetylcholinesterase
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| The sliding of actin myofilaments past myosin myofilaments during contraction is called_______ | Sliding Filament Mechanism
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| A contraction of an entire muscle in response to a stimulus that caused the action potential in one or more muscle fibers. | Muscle Twitch
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| A muscle fiber will not respond to stimulus until that stimulus reaches a level called______ | Threshold
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| The muscle fiber contract maximally. | All or None Response
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| The time between application of a stimulus to a motor neuron and the beginning of a contraction is | Lag Phase
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| The time of contraction is the | Contraction Phase
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| The time during which the muscle relaxes is | Relaxation Phase
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| Where the muscle remains contracted without relaxing | Tetany
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| The increase in number of motor units being activated is called______ | Recruitment
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| Needed for energy for muscle contraction | ATP
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| Muscle cells can store a high energy molecule called_____ | Creatine Phosphate
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| Without oxygen | Anaerobic Respiration
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| With oxygen | Aerobic Respiration
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| The amount of oxygen needed in chemical reactions to convert lactic acid to glucose and to replenish the depleted stores in muscle cells. | Oxygen debt
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| When ATP is used during muscle contraction faster than it can be produced in the muscle cells. | Muscle Fatigue
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| Equal distance | Isometric
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| Equal tension | Isotonic
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| Constant tension produced by muscles of the body for long periods of time. | Muscle Tone
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| Contract quickly and fatigue quickly. | Fast Twitch Fibers
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| Contract more slowly and more resistant to fatigue. | Slow Twitch Fibers
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| The most stationary end of the muscle. | Origin
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| The end of the muscle undergoing the greatest movement. | Insertion
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| The portion of the muscle between the origin and the insertion is the | Belly
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| Muscle that work together to accomplish specific movements are called______ | Synergists
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| Muscles that work in opposition to one another are called______ | Antagonists
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| Raises the eyebrows | Occipitofrontalis
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| Closes the eyelids, causes crowfeet. | Orbicularis Oculi
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| Frowning | Depressor Anguli Oris
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| Pulls corners of lips downward. | Platysma
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| Chewing | Masfication
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| Moves the tongue. | Extrinsic tongue muscle
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| Changes shape of tongue | Intrinsic
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| Along each side of the vertebral column Resp. for keeping the back erect. | Erector Spirae
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| Sneering | Levator Labii Superioris
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| 2 Characteristic of cardiac muscle. | Involentary, Not Striated
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| 2 Characteristic of smooth muscle. | Not Strated, No Nucleus
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| 2 Types of tongue muscles. | Extrinstic, Intrinsic
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| A muscle fiber is surrounded by the _________ | Endomysium
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| This occurs in the presence of oxygen. | Aerobic Respiration
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| An anterior thigh muscle that exteneds the leg is the_______ | Sartorius
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| The muscle responsible for elevating the ribs during inspiration is ____________ | The Rectus Adbominis
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| The biceps brachii and thr triceps brachii are _____________ and _____________ | Synergists and Antagonists
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| Occurs in the absence of oxygen. | Anaerobic Respiation
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| Two types of fibers? | Fast Twitch,Slow Twitch
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| Two types of muscle contractions? | Isometric, Istonic
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| A high-energy molecule that can be quickly used to produce ATP. | Creatine Phosphate
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| Extends from on Z line to the next. | Sarcomere
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| How are muscle named. | Location, Function
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| Flexor carpi is located in the _______ | Forarm
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| Extend from one end of the muscle fiber to the other. | Muscles Myofibrils
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