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Stack #2652864

Muscle cells Muscle fibers
M line A dark band that anchors the myosin in the center of the sarcomere
H zone Light area in the center of sarcomeres
A band Extends the length of the myosin
I band Consists of actin
The arrangement of actin and myosin give a _______ appearance. Banded
Basic structural and functional unit of a muscle Sarcomeres
Sarcomeres Joined end to end to form the myofibril
Myosin myofilaments Thick myofilaments
Actin myofilaments Thin myofilaments
Myofilaments consist of two major kinds of protein fibers Actin Myosin
Minute Small
Resting membrane potential The charge difference across the membrane
Action potential The brief reversal back of the charge
Motor neurons Nerve cells that carry action potentials to skeletal muscle fibers
Muscles are named according to their ___, ____, ____, ____, ____, ____, and _____ Location Size Orientation of fibers Shape Origin Insertion Function
Antagonists Muscles that work in opposition to one another
Synergists Muscles that work together to accomplish specific movements
Belly The portion of the muscle between the origin and the insertion
Prime mover One muscle playsa major role in accomplishing he desired movement
Occipitofromtalis Raises the eyebrow
Orbicularis oculi Closes the eyelids and causes wrinkles
Orbicularis oris Pickers the lip
Buccinator Flattens the cheeks
Zygomaticus Smiling muscle
Lavator labii superioris Sneering
Depressor anguli oris Frowning
Mastication Chewing
4 pairs of mastication muscles Two pairs of ptertgoids temporalis Masseter
Intrinsic tongue muscles Change the shape of the tongue
Extrinsic toungue muscles Move the tongue
Sternocleidomastoid Lateral neck muscle and prime mover
Neuromuscular junction Each branch that connects to the muscle
Insertion The end of the muscle undergoing the greatest movement
Origin The most stationary end of the muscle
The points of attachment of each muscle are it’s ____ and _____ Origin Insertion
Slow twitch fibers Contract more slowly and are more resistant to fatigue
Fast twitch fibers Contract quickly and fatigue quickly
Muscle tone Constant tension produced by the muscle is constant during contraction
Isotonic The amount of tension produced by the muscle is constant during contraction, but the length of the muscle changes
Isometric The length of the muscle doesn’t change, but the amount of tension increases during the contraction process
2 types of muscle contractions Isometric Isotonic
Muscle fatigue Results when ATP is used during muscle contraction faster than it can be produced in the muscle cells
Oxygen debt The amount of oxygen needs in chemical reactions to convert lactic acid to glucose
Aerobic respiration With oxygen
Anaerobic respiration Without oxygen
Creating phosphate Another high energy molecule
ATP Short lived and unstable
Recruitment The increase in number of motor units being activated
Tetany The muscle remains contracted without relaxing
Relaxation phase The time during which the muscle relaxes
Contraction phase Time of contraction
Lag phase Time between application of stimulus to a motor neuron and the beginning of a contraction
All or none response When threshold is reached
Threshold The point where muscle fibers contract maximallly
Muscle twitch A contraction of an entire muscle in response to a stimulus
Sliding filament mechanism The sliding of actin past myosin during contraction
Acetylcholinesterase Enzymes that rapidly break down neuron and muscle cells
Acetylcholine A neurotransmitter
Synaptic vesicles Secretes neurotransmitter called acetylcholine
Postsynaptic terminal Muscle fiber
Synaptic cleft The presynaptic terminal and the muscle cell
Prestnaptic terminal Enlarged nerve terminal
Motor unit A single motor neuron
Myofibrils A threadlike structure that extends from one end of the fiber to the other
Endonysium Surround the muscle fiber
Muscle fibers Single muscle cell
Fasciculi Bundles of muscle
Fascia Surrounds and separate muscles
Epimysuim Connective tissue that surround entire muscle
Epi Upon
Elasticity Absolute to recoil
Extensibility The ability to be stretched
Excitability The capacity of skeletal muscle to respond to a stimulus
Contractility The ability of skeletal muscle to shorten with force
Created by: Blaze24