anatomy test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| The ability of skeletal muscle to shorten with force | contractility
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| 2 major kinds of protein fibers | actin and myosin
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| What is extensibility? | the ability to be stretched
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| The capacity of skeletal muscle to respond to a stimulus | excitability
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| The ability to recoil to their original resting length after they have been stretched | elasticity
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| Connective tissue shealth that surrounds each skeletal muscle | epimysium
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| connective tissue locate outside the epimysium | fascia
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| What are fibers? | Fasciculi that are composed of single muscle cells
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| Connective tissue sheath that that surrounds each fiber | endomysium
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| myofibrils | A threadlike structure that extends from one end of the fiber to the other
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| It resembles two strands of pearls | actin
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| It resembles bundles of minute golf clubs | myosin
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| Actin and myosin form highly ordered units called | sacromeres
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| Extends from Z line to Z line | sarcromere
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| A bands contain | myosin
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| I bands contain | actin
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| The space between the A bands is called the | H zone
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| Nerve cells that carry action potentials to skeletal muscle fibers | motor neurons
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| The charge difference across the membrane is called the | resting membrane potential
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| The brief reversal back of the charge is called | action potential
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| A single motor neuron and all the skeletal muscle fibers it innervates | motor unit
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| presynaptic terminal | the enlarged nerve terminal
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| the space between the presynaptic terminal and the muscle cell | synaptic cleft
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| postsynaptic terminal | the muscle fiber
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| acetylcholine | a neurotransmitter in the presynaptic terminals
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| acetylcholinesterase | when the acetylcholine is released into the synaptic cleft between the neuron and muscle cell
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| The sliding of actin myofilaments past myosin myofilaments during contraction | sliding filament mechanism
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| muscle twitch | a contraction of an entire muscle in response to a stimulus
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| threshold | the point at which the muscle fiber will contract maximally
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| the time between application of a stimulus to a motor neuron | lag phase
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| the time of the contraction | contraction phase
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| the time during which the muscle relaxes | relaxation phase
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| tetany | where the muscle remains contracted without relaxing
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| recruitment | the increase in number of motor untis being activated
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| anaerobic respriation | without oxygen
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| aerobic respiration | with oxygen
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| oxygen debt | the amount of oxygen needed in chemical reactions
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| muscle fatigue | results when ATP is used more than it can be produced
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| isometric | equal distance
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| isotonic | equal tention
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| muscle tone | constant tension produced by the muscles of the body
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| fast-twitch fibers | contract quickly and fatigue quickly
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| slow-twitch fibers | contact slowly and fatigue slower
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| origin | the most stationary end of the muscle
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| insertion | the end of the muscle undergoing the most movement
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| belly | the portion of the muscle between the origin and the insertion
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| synergists | muscles that work together to accomplish specific movements
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| antagonists | muscles that work in opposition of each other
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| the muscle that plays a major role accomplishing a movement | prime mover
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| occipitofrontales | raises the eyebrows
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| closes the eyelid | orbicularis oculi
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| puckers the lips | orbicularis oris
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| flatens the cheeks | buccinator
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| zygomaticus | smiling
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| levator labii superioris | sneering
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| depressor anguli oris | frowning
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| mastication | chewing
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| extrensic tongue muscle | moves the tongue
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| intrinsic tongue muscle | changes the shape of tongue
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| sternocleidomastoid | rotates and abducts neck
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| erector spine | found on each side of the back responsible for posture
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| external intercostals | contract during inspiration
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| internal intercostals | contract during forced expiration
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| diaphragm | dome-shaped muscle that is responsible for quiet breathing
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| rectus abdominus | abs
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| linea alba | connective tissue that extends from the sternum to the pubis
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| tendinous inscription | cross the rectus abdominus in 3 places and form a segmented look in the abs
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| external abdominal obliques | internal and transverse
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| deltoid | attaches the humerus to the scapula and clavicle
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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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| gluteus maximus | buttocks
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| quadriceps femoris | extends the leg
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| sartorius | flexes the thigh
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Created by:
BigAl24
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