anatomy
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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| Excitability | muscle to respond to a stimulus
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| Extensibility | ability to be stretched
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| Elasticity | ability to recoil their original shape
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| Contractility | muscle to shorten with force
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| Epimysium | skeletal muscle is surrounded by a connective tissue
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| Fascia | connective tissue located outside the epimysium
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| Endomysium | each fiber is surrounded by a connective tissue sheath
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| Myofibrils | threadlike structure that extends from one end of the fiber to the other
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| Actin Myofilaments | thin myofilaments
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| Myosin Myofilaments | thick myofilaments
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| sarcomeres | joined end to end to form the myofibril
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| A Band | extends the length of the myosin
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| Resting Membrane Potential | the charge diffrence across the membrane
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| Action potential | The breif reversal back of charge
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| Motor Neurons | nerve cells that carry action potential to the skeletal muscle fibers
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| Neuromusclar junction | forms each branch that connects to the muscle
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| Synapse | near the center of the cell
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| Motor Unit | a single motor neuron and all skeletal muscle fibers
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| Presynaptic terminal | the enlarged nerve terminal
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| Synaptic cleft | space between the presynaptic terminal and the muscle cell
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| Postsynaptic terminal | the muscle fiber
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| Synaptic vesicles | Presynaptic terminal contains
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| Acetylcholine | secretes a neurootransmitter
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| Sliding filament mechanism | the sliding of actin myofilaments past myosin myofilaments during contgraction
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| Thresold | A muscle fiber will not respond to stimulus until that stimulus reaches that level
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| All-or-None Response | A Phenomenon
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| Lag phase | the time between application of a stimulus to a motor neuron and beginning of a contraction
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| Contraction phase | the time of contraction
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| Relaxation Phase | the time during which the muscle relaxes
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| Tetany | where the muscle remains contracted without relaxing
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| Recruitment | the increase in number of motor units being activated
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| Creatine Phosphate | high energy molecule
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| Anaerobic Respiration | without oxygen
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| Aerobic Respiration | with oxygen
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| Oxygen Debt | the amount of oxygen needed in chemical reactions to convert lactic acid to glucose
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| Muscle Fatigue | result when ATP is used during muscle contraction faster than it can be produced
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| Isometric | equal distance
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| Isotonic | equal tension
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| Muscle tone | muscle tone refers to constant tension produced by muscles of the body for long periods of time
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| Fast twitch fibers | contract quickly and fatigue quickly
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| slow twitch fibers | contract more slowly and more resistant to fatigue
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| Origin | the most stationary end of the muscle
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| Insertion | is the end of the muscle undergoing the greatest movement
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| Belly | the portion of the muscle between the origin and insertion
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| Synergist | muscle that works together to accomplish specific movement
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| Antagonist | muscles that work in opposition to one another
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| Prime mover | one muscle playing the major role in accomplishing the desired movement
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| Occipitofrontalis | raises the eyebrows
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| Orbicularis oculi | closes the eyelids and causes wrinkles in the skin at lateral corners of the eye
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| Orbicularis oris | puckers the lips
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| Buccinator | flattens the cheeks.
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| Zygomaticus | smiling muscle
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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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| Intrinsic tongue muscle | change the shape of the tongue
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| Extrinsic tongue muscle | moves the tongue
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| Thoracic muscle | muscle that moves the thorax
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| Trapezius | rotates scapula
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| Serratus anterior | pulls scapula anteriorly
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| Pectoralis major | adducts and flexes the arm
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| Deltoid | attaches the humerus to the scapula and clavicle
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| Triceps brachii | extends the forearm
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| Biceps brachii | flexes the forearm occupies the anterior compartment of the arm
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| Brachialis | flexes the forearm
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| Brachioradialis | flexes and supinates the forearm
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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 finger
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| Extensor digitorum | extends fingers
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| Gluteus maximas | buttocks
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| Quadriceps femoris | extends the leg and anterior thigh muscle
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| Sartorius | flexes the thigh
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| Hamstring | posterior thigh muscle flexes the leg and extends thigh
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| Gastrocnemius | forms the calf muscle
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