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Excitability muscle to respond to a stimulus
Extensibility ability to be stretched
Elasticity ability to recoil their original shape
Contractility muscle to shorten with force
Epimysium skeletal muscle is surrounded by a connective tissue
Fascia connective tissue located outside the epimysium
Endomysium each fiber is surrounded by a connective tissue sheath
Myofibrils threadlike structure that extends from one end of the fiber to the other
Actin Myofilaments thin myofilaments
Myosin Myofilaments thick myofilaments
sarcomeres joined end to end to form the myofibril
A Band extends the length of the myosin
Resting Membrane Potential the charge diffrence across the membrane
Action potential The breif reversal back of charge
Motor Neurons nerve cells that carry action potential to the skeletal muscle fibers
Neuromusclar junction forms each branch that connects to the muscle
Synapse near the center of the cell
Motor Unit a single motor neuron and all skeletal muscle fibers
Presynaptic terminal the enlarged nerve terminal
Synaptic cleft space between the presynaptic terminal and the muscle cell
Postsynaptic terminal the muscle fiber
Synaptic vesicles Presynaptic terminal contains
Acetylcholine secretes a neurootransmitter
Sliding filament mechanism the sliding of actin myofilaments past myosin myofilaments during contgraction
Thresold A muscle fiber will not respond to stimulus until that stimulus reaches that level
All-or-None Response A Phenomenon
Lag phase the time between application of a stimulus to a motor neuron and beginning of a contraction
Contraction phase the time of contraction
Relaxation Phase the time during which the muscle relaxes
Tetany where the muscle remains contracted without relaxing
Recruitment the increase in number of motor units being activated
Creatine Phosphate high energy molecule
Anaerobic Respiration without oxygen
Aerobic Respiration with oxygen
Oxygen Debt the amount of oxygen needed in chemical reactions to convert lactic acid to glucose
Muscle Fatigue result when ATP is used during muscle contraction faster than it can be produced
Isometric equal distance
Isotonic equal tension
Muscle tone muscle tone refers to constant tension produced by muscles of the body for long periods of time
Fast twitch fibers contract quickly and fatigue quickly
slow twitch fibers contract more slowly and more resistant to fatigue
Origin the most stationary end of the muscle
Insertion is the end of the muscle undergoing the greatest movement
Belly the portion of the muscle between the origin and insertion
Synergist muscle that works together to accomplish specific movement
Antagonist muscles that work in opposition to one another
Prime mover one muscle playing the major role in accomplishing the desired movement
Occipitofrontalis raises the eyebrows
Orbicularis oculi closes the eyelids and causes wrinkles in the skin at lateral corners of the eye
Orbicularis oris puckers the lips
Buccinator flattens the cheeks.
Zygomaticus smiling muscle
Levator labii superioris sneering
Depressor anguli oris frowning
Mastication chewing
Intrinsic tongue muscle change the shape of the tongue
Extrinsic tongue muscle moves the tongue
Thoracic muscle muscle that moves the thorax
Trapezius rotates scapula
Serratus anterior pulls scapula anteriorly
Pectoralis major adducts and flexes the arm
Deltoid attaches the humerus to the scapula and clavicle
Triceps brachii extends the forearm
Biceps brachii flexes the forearm occupies the anterior compartment of the arm
Brachialis flexes the forearm
Brachioradialis flexes and supinates the forearm
Flexor carpi flexes the wrist
Extensor carpi extends the wrist
Flexor digitorum flexes the finger
Extensor digitorum extends fingers
Gluteus maximas buttocks
Quadriceps femoris extends the leg and anterior thigh muscle
Sartorius flexes the thigh
Hamstring posterior thigh muscle flexes the leg and extends thigh
Gastrocnemius forms the calf muscle
Created by: munchiesLOL