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Muscles

QuestionAnswer
The ability of muscle to shorten Contractility
Capacity of skeletal muscle to respond to stimulus Excitability
Ability to be stretched Extensibility
Ability to recoil to original resting length Elasticity
Connective tissue sheath Epimysium
Connective tissue located outside of the epimysium Fascia
Loose connective tissue Perimysium
single muscle cells fibers
Connective tissue sheath Endomysium
A threadlike structure that extends from one end of the fiber to the other Myofibrils
Thin myofilaments Actin Myofilaments
Thick myofilaments Myosin Myofilaments
Actin and myosin myofilaments form highly ordered units Sarcomeres
Attachment site for actin Z line
Extends the length of the myosin A band
The charge difference across the membrane resting membrane potential
Brief reversal back of the charge Action potential
Nerve cells carry action potentials to skeletal muscle fibers Motor neurons
A single motor neuron and all the skeletal muscle fibers it innervates Motor unit
Enlarged nerve terminal Presynaptic Terminal
the space between the presynaptic terminal and the muscle cell Synaptic cleft
the muscle fiber postsynaptic terminal
Neurotransmitter Acetylcholine
Actin and myosin myofilaments slide past one another Sliding filament mechanism
A contraction of an entire muscle muscle twitch
The muscle fiber will contract maximally Threshold
the time of contraction contraction phase
the muscles relax relaxation phase
The muscle remains contracted without relaxing Tetany
The increase in number of motor units being activated Recruitment
Needed for muscle contraction ATP (Adenosine triphosphate)
Produced in the mitochondria ATP
Without oxygen Anaerobic respiration
With oxygen Aerobic respiration
The amount of oxygen needed in chemical reactions to convert lactic acid to glucose Oxygen debt
ATP is used during muscle contraction faster than it can be produced Muscle Fatigue
the length of the muscle doesn't change Isometric
the length of the muscle changed Isotonic
Constant tension produced by muscles of the body for long periods of time Muscle tone
Contract quickly and fatigue quickly Fast-Twitch fibers
The most stationary end of the muscle Origin
End of the muscle undergoing the greatest movement Insertion
Muscles that work together to accomplish specific movements Synergists
Muscles that work in opposition to each other Antagonists
One muscle plays the major role in accomplishing the desired movement Prime Mover
Chewing Mastication
Neck muscle Sternocleidomastoid
Muscles that move the thorax Thoracic muscles
Accomplishes quiet breathing Diaphragm
Flexes the wrist Flexor carpi
Extends the wrist extensor carpi
flexes the fingers flexor digitorum
extends the fingers extensor digitorum
attaches humerus to the scapula and the clavicle deltoid
extends the forearm triceps brachii
Rotates scapula trapezius
Buttocks Gluteus maximus
"Tailors muscle" Sartorius
Posterior thigh muscles Hamstring muscles
20 Muscles located within the foot Intrinsic foot muscles
The point of attachment of each muscle its origin and insertion
Changes the shape of the tongue Intrinsic tongue muscles
Moves the tongue Extrinsic tongue muscles
Tendinous area of the abdominal wall Linea alba
Group of muscles on each side of the back Erector spine
Posterior thigh muscles Hamstring muscles
Attaches the humerus to the scapula and clavical Deltoid
Strong band of of fibrous connective tissue that covers the flexor Retinaculum (bracelet)
Flexes the thigh Sartorius
The arm is attached to the thorax by.. the pectoralis major and latissimus dorsi muscles
20 muscles located in the foot intrinsic foot muscles
the lateral muscles of the leg Peroneus
The time between application of a stimulus to a motor neuron and the beginning of a contraction lag phase
Created by: blblank4
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