The muscles of the body
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| Contractility | Ability of skeletal muscle to shorten with force.
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| Excitability | Caoacityof skeletal muscle to respond to a stimulus.
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| Four Characteristics of skeletal muscles | Contractility,excitability,extensibility, elasicity
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| Connective tissue located outside the epimysium? | Fascia
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| connective tissue sheath surrounding the skeletal muscle? | epimysium
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| fasciculi are composed of? | single muscle cells called fibers
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| muscle fasciculi are surrounded by? | lose connective tissue called perimysium
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| what occurs in the absence of oxygen? | anerobic respiration
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| muscle fibers that fatigue quickly | fast twitch
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| muscle fibers that are resistant to fatigue | slow twitch
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| what raises the eyebrows | capiton frontalis
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| two types of tongue muscles | interior, exterior
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| what closes the eyelids | orbicularis occuli
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| what is actin myofilaments | thin myofilaments
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| myosin myofilaments | thick myofilaments
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| what is sarcomeres | basic structural and functional unity of the muscle.
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| Erector spinae | group of muscles on each side of the back.
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| what is the erector spinae responsible for | for keeping the back straight and the body erect
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| Thoracic Muscles | muscles that move the thorax
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| Leg Movements | Quadriceps femoris & Sartorius
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| Sartorius | “tailors muscle”; flexes the thigh
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| Quadriceps femoris | extends the leg; anterior thigh muscles
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| Hamstring muscles | flexes the leg and extends the thigh
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| Gastrocnemius and soleus form what | calf muscles
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| Flexor carpi | flexes the wrist
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| Extensor carpi | extends the wrist
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| Flexor digitorum | flexes the fingers
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| Extensor digitorum | extends the fingers
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| Triceps brachii | extends the forearm. Occupies the posterior compartment of the arm
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| BEGINING OF A CONTRACTION | lag phase
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| time of contraction | contraction phase
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| time when muscle relaxes | relaxation phase
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| tetany | muscle remains contracted without relaxing
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| where is ATP produced | mitochondria
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| when ATP is used faster than it is produced | muscle fatigue
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| anaerobic respiration | without oxygen
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| aerobic respiration | with oxygen
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| muscle fatigue | when ATP is being used faster than it is produced
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| isometric | length stays the same tention increases
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| isotonic | amont of tention is constantduring contraction
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| muscle tone | constant tention produced by musles of the body for long periods of time
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| origin | most stationary end of the muscle
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| insertion | end of the muscle undergoing greatest movemnt
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| part of muscle between the origin and the insertion is called? | belly
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| each sarcomere extends from what? | Z line
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| enlarged nerve terminal | presynaptic terminal
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| muscles that work together to acomplish speccificmovements are called | synergists
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| muscles that work in opposition of eachother are called | antagonists
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| Trapezius | rotates scalpula
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| serratus anterior | pulls scapula anteriorly
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| arm is attached to the? | thorax
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| pectoralis major | adducts and flexes arm
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| "swimmer muscles" | latissimus dorsi
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| deltoid | attaches the humerous to the scalpula and clavical
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| gluteus maximus | buttocks
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| gluteus medius | hip muscle
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| common injection site | gludeus medius
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| quadriceps femoris | extends the leg
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| sartorius | flexes thigh
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| extends thigh | hamstring
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| gastronemius and soleus | form the calf muscle
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| lateral muscle of the leg | peronous
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| 20 muscles located in the foot | intrinsic foot
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| prime mover | one who plays a major role in accomplishing the desired movement
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| two major kind of protin fibers | actin and myosin
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| resting membrane potential | charge difference across membranes
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| action potential | the breif reversal back of charge
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| synaptic vesicles | secrete a neurotransmitter
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| acetylcholine | neurotransmitter
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| synaptic cleft | muscle cell
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| motor unit | form single muscle
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| motor neurons | nerve cells that carry actin potentials
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| all or none response | reaches threshold or doesnt
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| broken down by enzymes | acetylcholinesterase
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| A band extends the length of ? | myosin
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