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Ch. 6 Muscles 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 recoil to their original resting length after they have been stretched Elasticity
Each skeletal muscle is surrounded by a connective tissue sheath called? Epimysium
Another connective tissue located outside the epmysium Fascia
A muscle is composed of numerous visible bundles called muscle fasciculi, which are surrounded by? Perimysium
The fasciculi are composed of single muscle cells called? Fibers
Each fiber is surrounded by a connective tissue sheath called? Endomysium
The cytoplasm of each fiber is filled with? Also it is a threadlike structure Myofibrils
Then myofilaments Actin myofilaments
Thick myofilaments Myosin myofilaments
Actin and myosin myofilaments form highly ordered units called? Sacromeres
The charge difference across the membrane is called? Resting membrane potential
The brief reversal back of the charge is called? Action potential
Nerve cells that carry action potentials to skeletal muscle fibers Motor neurons
Each branch that connects to the muscle forms? Neuromuscular junction or Synapse
A single motor neuron and all the skeletal muscle fibers it innervates are called? Motor unit
The enlarged nerve terminal is? Presynaptic terminal
The space between the presynaptic terminal and the muscle cells is? Synaptic cleft
The muscle fibers is the? Postsynaptic terminal
Each presynaptic terminal contains what? Synaptic vesicles
Synaptic vesicles secrets a neurotransmitter called? Actetylcholine
The sliding of actin myofilaments past myosin myofilaments during contraction Sliding filament mechanism
A contraction of an entire muscle in response to a stimulus Muscle Twitch
A muscle fiber will not respond to stimulus until that stimulus reaches level Threshold
At which point the muscle fiber will contract maximally All-or-none response
The time between application of a stimulus to a motor neuron and the beginning of a contraction Lag Phase
The time of contraction Contraction Phase
The time during which the muscle relaxes Relaxation Phase
The muscle remains contracted without relaxing Tetany
The increase in number of motor units being activated Recruitment
Needed for energy for muscle contraction ATP
ATP degenerates to the more stable ___ plus phosphate ADP
High end molecule in the muscle cells that get stored Creatine phosphate
Without oxygen Anaerobic respiration
With oxygen Aerobic respiration
The amount of oxygen needed in chemical reactions Oxygen debt
Results when ATP is used during muscle contraction faster than it can be produced in the muscle cells Muscle fatigue
The length of the muscle does not change, but tension does Isometric
The amount of tension produced by the muscle is constant during contraction, but length changes Isotonic
Muscle tone refers to 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 are 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 an the insertion Belly
Muscles work together to accomplish specific movements Synergists
Muscles that work in opposition to one another Antagonists
Raises the eyebrows Occipitofrontals
Closes the eyelids Orbicularis oculi
Orbicularid oris Puckers the lips
Flattens the cheeks Buccinator
Smiling muscle Zygomaticus
Sneering Levator labii superioris
Frowning Depressor anguli oris
Chewing Mastication
Changes the shape of the tounge Intrinsic Tounge Muscles
Move the Tounge Extrinsic Tounge Muscles
Lateral neck muscle and prime mover Sternocleidomastoid
Group of muscles on each side of the back Erector spinae
Muscles that move the thorax Thoracic Muscles
Elevate the ribs during inspiration External intercostals
Contract during forced expiration Internal intercostals
Accomplishes quiet breathing Diaphragm
This tendinous inscriptions cross the rectus abdominis at three or more locations Tendinous inscription
A tendinous area of the abdominal wall Linea Alba
Area of each side of the abdominal wall Linea Alba
Rotates scalula Trapezius
Pulls scalula anterioly Serratus anterior
The arm is attached to the thorax by the? Pectoralis major and latissimus Doris muscles
Adducts and flexed the arms Pectoralis major
Medially rotates, adducts, and powerfully extends the arms Latissimus Doris
Attaches the humerus to the scalula and clavicle Deltoid
Extends the leg Quadriceps femoris
Posterior thigh muscle Hamstring
Form the calf muscle Gastrocnemius and soleus
Created by: LeviLucas



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