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75 Muscles Flash Cards

The ability of skeletal muscle to shorten with force. Contractility
The capacity of skeletal muscle to respond to a stimulus. Excitability
The ability to stretched. Extensibility
The ability to recoil to their original resting length after they have been stretched. Elasticity
Four Major Functional Characteristics Contractility, Excitability, Extensibility, Elasticity
A connective tissue sheath that surrounds the skeletal muscle. Epimysium
Is another connective tissue located outside the epimysium that surrounds and separates muscles. Fascia
Loose connective tissue that surrounds muscle fasciculi. Perimysium
The fasciculi are composed of single muscle cells called _______ Fibers
Fibers are surrounded by a connective tissue sheath called _______ Endomysium
The cytoplasm of each fiber is filled with ______ Myofibrils
Myofibrils consist of 2 major kinds of protein fibers Actin Myofilaments, Myosin Myofilaments
Thin myofilaments that resemble 2 minute strands of pearls twisted together. Actin Myofilaments
Thick myofilaments that resemble bundles of minute golf Myosin Myofilaments
Actin and myosin myofilaments form highly ordered units called _______ Sarcomeres
The charge difference across the membrane. Membrane Potential
The briefly reversal back of charge is called _______ Action Potential
Nerve cells that carry action potentials to skeletal muscle fibers. Motor Neurons
A branch that connects to the muscle. Neuromuscluar Junction
A single motor neuron and all the skeletal muscle fibers it innervates are called _______ Motor Unit
The space between the presynaptic terminal and muscle cell is the _________ Synaptic Cleft
Enlarged nerve terminal. Presynaptic Terminal
Each presynaptic terminal contains Synaptic Vesicles
Synaptic vesicles secrete a neurotransmitter called _______ Acetylcholine
The acetylcholine relased into the synaptic cleft between the neuron and musle cell is rapidly broken down by an enzymes. Acetylcholinesterase
The sliding of actin myofilaments past myosin myofilaments during contraction is called_______ Sliding Filament Mechanism
A contraction of an entire muscle in response to a stimulus that caused the action potential in one or more muscle fibers. Muscle Twitch
A muscle fiber will not respond to stimulus until that stimulus reaches a level called______ Threshold
The muscle fiber contract maximally. All or None Response
The time between application of a stimulus to a motor neuron and the beginning of a contraction is Lag Phase
The time of contraction is the Contraction Phase
The time during which the muscle relaxes is Relaxation Phase
Where the muscle remains contracted without relaxing Tetany
The increase in number of motor units being activated is called______ Recruitment
Needed for energy for muscle contraction ATP
Muscle cells can store a high energy molecule called_____ Creatine Phosphate
Without oxygen Anaerobic Respiration
With oxygen Aerobic Respiration
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
When ATP is used during muscle contraction faster than it can be produced in the muscle cells. Muscle Fatigue
Equal distance Isometric
Equal tension Isotonic
Constant tension produced by muscles of the body for long periods of time. Muscle Tone
Contract quickly and fatigue quickly. Fast Twitch Fibers
Contract more slowly and more resistant to fatigue. Slow Twitch Fibers
The most stationary end of the muscle. Origin
The end of the muscle undergoing the greatest movement. Insertion
The portion of the muscle between the origin and the insertion is the Belly
Muscle that work together to accomplish specific movements are called______ Synergists
Muscles that work in opposition to one another are called______ Antagonists
Raises the eyebrows Occipitofrontalis
Closes the eyelids, causes crowfeet. Orbicularis Oculi
Frowning Depressor Anguli Oris
Pulls corners of lips downward. Platysma
Chewing Masfication
Moves the tongue. Extrinsic tongue muscle
Changes shape of tongue Intrinsic
Along each side of the vertebral column Resp. for keeping the back erect. Erector Spirae
Sneering Levator Labii Superioris
2 Characteristic of cardiac muscle. Involentary, Not Striated
2 Characteristic of smooth muscle. Not Strated, No Nucleus
2 Types of tongue muscles. Extrinstic, Intrinsic
A muscle fiber is surrounded by the _________ Endomysium
This occurs in the presence of oxygen. Aerobic Respiration
An anterior thigh muscle that exteneds the leg is the_______ Sartorius
The muscle responsible for elevating the ribs during inspiration is ____________ The Rectus Adbominis
The biceps brachii and thr triceps brachii are _____________ and _____________ Synergists and Antagonists
Occurs in the absence of oxygen. Anaerobic Respiation
Two types of fibers? Fast Twitch,Slow Twitch
Two types of muscle contractions? Isometric, Istonic
A high-energy molecule that can be quickly used to produce ATP. Creatine Phosphate
Extends from on Z line to the next. Sarcomere
How are muscle named. Location, Function
Flexor carpi is located in the _______ Forarm
Extend from one end of the muscle fiber to the other. Muscles Myofibrils
Created by: Marissacombs180