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Noah Lucas

Anatomy Ch 6 Muscles

Ability of skeletal muscle to shorten with force Contractility
Capacity of skeletal muscle to respond to a stimulus Excitability
Ability to be stretched Extensibility
Ability to recoil to their original resting length after they have been stretched Elasticity
Connective tissue sheath that surrounds each skeletal muscle Epimysium
Connective tissue located outside the epimysium that surrounds and seperates muscles. Fascia
Loose connective tissue that surrounds bundles called muscle fasciuli. Perimysium
A single cylindrical muscle cell containing several nuclei. Muscle Fiber
Connective tissue sheath surrounding each muscle fiber Endomysium
Myofibrils consist of 2 major kinds of Protein fibers
Thin myofilaments that resemble 2 minute strands of pearls twisted together actin myofilaments
Thick myofilaments that resemble bundles of minute golf clubs. Myosin myofilaments
Highly ordered units formed by actin and myosin, joined end to end to form the myofibril Sarcomeres
Basic structural and functional unity of the muscle Sarcomere
The outside of most cell membranes is positively charged compared to the inside of the cell membrane, which is negatively charged. That charge difference across the membrane is called Resting membrane potential
Thoracic Musclus? Involved in breathing
Sliding of actin myofilaments past myosin myofilaments during contraction? Sliding filament mechanism
Brachioradialis? Flexes and pronates forearm
latissimus dorsi? Medially rotates and extends arm
Rotator cuff muscles? Attaches humerus to scapula
A muscle fiber will not respond to stimulus until that stimulus reaches a level called? threshold
Tendinous inscriptions Connective tissue that crosses the rectus abdomins giving it a segmented appearance in a muscled person
Linea alba? Extends from sternum to the Naval down to the pubis
Group of muscle on each side of back responsible for keeping back straight and body erect Erector spinae
Rhomboids? Draw scapula toward vertebral column
Deltoid? Flexes, extends, and abducts the arm.
Pectoralis major? "chest muscle" adducts and flexes the arm.
Pulls the scapula inferiorly Pectoralis minor
Quiet breathing Diaprham
Contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers Muscle twitch
Elevate ribs during inspiration External intercostals
Contract during force expiration Internal intercostals
Extends forearm Triceps brachii
Flexes and suppinates forearm Biceps brachii
Primary flexer of the forearm brachialis
Sternocleidomastoid (prime mover), lateral neck muscle, toricollis, platysma Neck muscles
Extrensic tongue muscles Moves the tongue
Intrinsuc tongue muscles Changes shape of tongue
Intrinsic + extrensic tongue muscles Tongue and Swallowing muscles
Mastication Chewing
Responsible for frowning Depressor-anguli oris
Responsible for sneering Levator labii superioris
Responsible for smiling zygomaticus
Flattens cheek Buccinator
Puckers mouth Orbiculi oris
Closes eyelids and causes crows feet Orbicularis oculi
Raises eyebrows Occipito frontalis
Single motor neuron and all the skeletal muscle fibers it innirates motor unit
Each branch that connects to the muscle from a? Neuromuscular junction
Charge difference across the membrane Membrane Potential
Created by: rensho