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Anatomy 7/8

Jillian Jackson-Study Stack

QuestionAnswer
Skeletal muscle to shorten with force Contractility
Skeletal muscle to respond to a stimuli Excitability
Ability to be stretched Extensibility
Recoil to their original resting length after they have been stretched Elasticity
Connective tissue sheath that surrounds skeletal muscle Epimysium
Connective tissue located outside the epimysium Fascia
Muscle cells Fibers
A muscle is composed of numerous visible bundles Fasciculi (fasicle)
Fasciculi is surrounded by loose connective tissue called Permysium
Each fiber is surrounded by a connective tissue sheath Endomysium
The cytoplasm of each fiber is filled with Myofibrils
Threadlike structures that stretch from one end of the fiber to another Myofibrils
Myofibrils consist of two major kinds of protein fibers Actin & myosin
Thin myofilaments Actin
Thick myofilaments Myosin
Actin and myosin myofilaments form highly ordered units Sarcomeres
Join end to end to form the myofibril Sarcomeres
Basic structural and functional unity of the muscle Sarcomere
Occipito frontals Raise eyebrows
Orbicularis oculi Closes eyelids & causes "crows feet"
Orbicularis oris Puckers the mouth
Buccinator Flattens the cheeks
"Trumpet Muscle" Buccinator
Two kissing muscles Orbicularis oris & buccinator
Zygomaticus Smiling
Lavator labiisuperioris Sneering
Depressor anguli oris Frowning
Chewing (another word) Mastication
Intriminis tongue muscles Change the shape of the tongue
Extrinsic tongue musles Move the tongue
External intercostals Elevate ribs during inspiration
Internal intercostals Contract during forced expiration
Diaphram Quiet breathing
Rectus abdominus Flexes the vertebral column
Attaches humerus to the scapula Deltoid
Triceps brachii Extends forearm
Biceps brachii Flexes and suppinates forearm
Brachialis Primary flexor of forearm
Brachiaradialis Flexes and pronates forearm
Flexor carpi Flexes wrist
Extensor Carpi Extends wrist
Flexor digitorum Flexes digits
Extensor digitorum Extends digits
Rhomboids Draw the scapula toward the vertebral column
Pectoralis Major Adducts and flexes the arm
Pectoralis Minor Pulls the scapula inferiorly
Muscle tone Constant tension produced by muscles
Fast-twitch mucles Contract and fatigue quickly
Slow-Twitch muscles Contract and fatigue slowly
Origin Most stationary end of the muscle
Insertion End of muscle undergoing to greatest movement
Created by: kvfd90
 

 



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