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anatomy muscles chap


Contractility the ability of a skeletal muscle to shorten with force
Excitability the capacity of a skeletal muscle to respond to a stimulus
Extensesibility the ability to be streched
Elasticity the ability to recoil to their original resting length after they have been streched
epimysium each skeletal muscle is surrounded by a connective tissue seath called?
Fascia Another connrctive tissue located outside of the epimysium
Muscle Fasciculi (Fascicle) a muscle id composed of nemerous visible bundles called?
Perumysium Fasciculi (Fascicle) are surrounded by loose connective tissue called/
Fibers the fasciculi are composed of single muscles cells called?
Endomysium Each fiber is surrounded by a connective tissue seath called?
Myofibrils The cytoplasm of each fiber is filled with?
Myofibrils A thread like structure that extends from one end of the fiber to the other?
Actin and Myosin Myofilaments Myofibrils consist of 2 major kinds of protine fibers:
Actin Resembles 2 minute strands of pearls twisted together
Myosin Resembles bundles of minute golf clubs
Sacromeres Actin adn myosin myofilaments from highly ordered units called?
Sacromers the basic structural and functional unit of the muscles
Resting membranes potential The charge difference across the membrane is called?
Action Pontential When a muscle cell is stimulated the membrane characteristics change briefly, the brief reversal back of the charge is called?
motor neurons Nerve cells that carry action potentials to the skeletal muscles fibers
A neuromuscular junction or synapse Axons enter the muscles and branch, each branch that connects to the muscle forms?
A Motor Unit A single motor neuron and al the skeletal muscle fibers in innervates are called
Presynaptic terminal the enlarged nerve terminal
Synaptic Cleft Space between the presynaptic terminal and the muscle cell:
Synaptic vesicles Each presynaptic terminal contains
Acetylcholine Synaptic vesicles secret a neurotransmitter called?
Acetylcholinesterase The acetylcholine release into the synaptic cleft between the neuron and muscle cell is rapidly broken down by an enzymes
Muscke Contraction Occurs as action and myosin myofilaments slide past one another causing the sarcomers to shorten :
Sliding Filament Mechanism The sliding of action myofilaments past myosin myofilments during contraction is called
Muscle Twitch Contraction of an entire muscle in responce to a stimulus that causes the action potential in one or more muscles fibers:
Threshold A muscle fiber will not respond to a stimulus unit that stimulus reaches a level called?
The lag phase The time between application of a stimulus to a motor neuron and the beginning of a contaction is?
Contraction Phase Time of contraction
Muscle Fatigue Result when ATP is used during muscle contraction faster than it can be produced in the muscle cell
Isometic (Equal Distance) The length of the muscle does nto change, but the amount of tension increses during the contraction process
Isometric (Equal Tension) The amount of tension produced by the muscle id constant during contraction, but the length of the muscle changes :
muscle tension Constant tension produced by muscles of the body for long periods of time
Fast-Twitch Fibers (white meat of a chicken brest) Contract quickly and fatigue quickly
Slow-Twitch Fibers (Dark meat of a ducks brest or leg of chicken) Contract more slowly and are more resistant to fatigue
origin the most stationary end of the muscle
insertion the end of the muscle undergoing the greatest movement
Belly The portion of the muscle between the orgin and the insertion
Synergists Muscles that work together to accomplish specific movements are called?
Antagonists Muscles that work in opposition to one another are called?
The Prime Mover Among a group of synergists, if one muscle plays the major role in accomplishing the desired movement, it is:
Occipitofrontales Rasies eyebrows
Orbicularis Oculi Closes the eyelid
Orbiccularis Oris Puckers the lips
Buccinator Flattens the cheeks
Orbicularis oris, buccanator the two kissing muscles
Zygomaticus Smiling
Levator Labii Superioris Sneering
Depressor Anguli Oris Frowning
Mastication Chewing
Masseter, Temporalis, 2 Pterygoids 4 Pairs of Chewing muscles
Extrinsic tougue muscles moves the tongue
Intrinsic tongue muscles changes shape of the tongue
Stero Cleido Mastoid Rotates and Abducts neck
Errector Spinae Found in each side of the back, respondable for errect posture
External intercostals Contract During Inspiration
Internal intercostals Contract during forced expirations
Diaphram Dome shaped muscle, responcible for quiet breathing
Rectus abdominis Abs
Linea Alba White line of connective tissue that extends from the sternum of the pelvis
Tendinous Inscription Cross the Rextus Abdominis in 3 places and from a segmented look in abs
Truck MusclesMuscles that move the verterbral column Trunk muscles
Thorasic Muscles muscles that move the trunk
Abdominal wall muscles muscles of the anterior abdominal wall flex and rotate the verebral column, compress the abdominal cavity, and hold in the abdominal viscera
trapezius Pulls scapula anteriorly
adducts and flexes the arm Pectoralis major
latissimus doris Medially rotaes adducts, and powerfully extends the arm. "swimmers muscles"
frontails moves the eyebrows
Orbicularis oculi located around the eye (muscle)
Masseter chewing muscles
Gluteus maximus buttocks
hamstring posterior thigh muscles
Created by: sarastarkey44