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Ch6 muscles

The ability of skeletal muscle to shorten with force Contractility
The capacity of skeletal muscle to respond to a stimulus Excitability
Ability to recoil to their original resting length after they have been stretched. Elasticity
Connective tissue located outside the epimysium Fascia
Surrounded by loose connective tissue Perimysium
Each fiber is surrounded by a connective tissue sheath called Endomysium
Each skeletal muscle is surrounded by a connective tissue sheath called Epimysium
Thin myofilaments Actin myofilaments
Thick myofilaments Myosin myofilaments
Actin and Myosin myofilaments form highly ordered units called Sarcomeres
The charge difference across the membrane is called Resting membrane potential
The brief reversal back of the charge is called Action potential
A single motor neuron and all the skeletal muscle fibers it innervates are called Motor unit
The enlarged nerve terminal is the Presynaptic Terminal
Nerve cells that carry action potentials to skeletal muscle fibers Motor Neurons
Each branch that connects to the muscle forms a Neuromusclular Junction OR Synapse
The enlarged nerve terminal is the Presynaptic terminal
The space between the presynaptic terminal and the muscle cell is the Synaptic cleft
The acetylcholine released into the synaptic cleft between the neuron and muscle cell is rapidly broken down by Acetylcholinesterase
The sliding action myofilaments past myosin myofilaments during contraction is called Sliding filament mechanism
A contraction of an entire muscle Muscle twitch
A muscle finer will not respond to stimulus if stimulus reached a level called Threshold
Phenomenon called All-or-nothing response
The time between application of a stimulus to a motor neuron and the beginning of a contraction Lag phase
The time if contraction is the Contraction
The time during which the muscle relaxes Relaxation phase
Where the muscle remains contracted without relaxing Tetany
The increase in number of motor units being active is called Recruitment
The H and a I bands shorten, but the __ ______ do not change in length A Bands
___ is needed for energy for muscle contraction ATP
They can store another high energy molecule called Creatine phosphate
Without oxygen Anaerobic respiration
With oxygen Aerobic respiration
The _______ _________ is the amount of oxygen needed in chemical reactions. Oxygen debt
Is used when ATP is used during muscle contraction Muscle Fatigue
The amount of tension increases during the contraction Isometric
The amount of tension produced by the muscle is constant during contraction Isotonic
Keeps head up and back straight Muscle tone
Contacts quickly Fast twitch fibers
Contacts more slowly Slow twitch fibers
Is the most stationary end of muscle Origin
Is the end of the muscle undergoing the greatest movement Insertion
The portion of the muscle between the origin and the insertion is the Belly
Muscles that work together to accomplish specific movements are Synergists
One muscle plays the major role in accomplishing the desired movement, it is the Prime mover
Muscle the works in opposition to one another are called Antagonist
Raises the eyebrows Occipitofrontalis
Cloeses the eyelids Orbicularis oculi
Puckers the lips Orbicularis Oris
Flattens the cheeks Buccinator
The kissing muscles Orbicularis Oris and buccinator
Smiling muscle Zygomaticus
Sneering Levator labii superioris
Frowning Depressor anguli Oris
Mastication= Chewing
4 pairs of muscles of mastication 2 pair of pterygoids Temporalis Masseter
Change the shape if tongue Instrinsic tongue muscles
Move the tongue Extrinsic tongue muscles
Rotates and abducts the head Sternocleidomastoid
Sheet like muscle that covers the anterolateral neck Platysma
Group of muscles on each side if back Erector spinae
Muscles that move the thorax Thoracic muscle
Most involved in breathing External and internal intercostals
Elevate the ribs during inspiration External intercostals
Contract during food expiration Internal intercostals
Accomplishes quiet breathing Diaphragm
The I band is located between the ______ and __________ The Z line and A bands
What is between the two A bands H zone
What type of myofilaments are in A bands? Myosin
What type of myofilaments are in I bands Actin
What line is in the H Zone The M Line
What is between the two I bands Z line
What is between the two Z lines Sarcomere
ATP is produced in the Mitochondria
Short lived and unstable ATP
Created by: DestinySchultz



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