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Michael Metzger

Chapter 6 Muscles

Muscle cells Muscle fibers
Muscle responsible for smiling Zygomaticus
Contractility Ability of muscle to shorten with force
Excitability The capacity of muscle to respond to a stimulus
Elasticity Ability to recoil to their original resting length after being stretched
Epimysium Surrounds each skeletal muscle; Connective tissue
Fascia Connective tissue that separates muscles
Sarcomere Formed by actin and myosin myofilaments
Actin myofilaments Thin; Resemble 2 small strands of pearls twisted together
Myosin myofilaments Thick; Resemble bundles of golf clubs
I band Consists of Actin; On each side of the Z line
Z line Attachment site for actin
A band Extends length of myosin; Darker central region of sarcomere
H zone Light area in the center of the sarcomere
M line Myosin filaments anchored in the center of the sarcomere
Resting membrane potential Outside of cells have negative charges and inside positive
Action potential Brief reversal of charges of the cell
Motor neurons Nerve cells that carry action potential
What do myofibrils contain? Actin and Myosin that form sarcomeres
Tetany When a muscle remains contracted without relaxing
Creatine phosphate High energy molecule that produces ATP
Anaerobic respiration Does not use oxygen
Aerobic respiration Uses oxygen
Fast twitch Muscle fibers that fatigue quickly
Slow twitch Muscle fibers that are more resistant to fatigue
Origin/Head Most stationary end of the muscle
Frontalis Raises eyebrows
Pectoralis Major Upper chest
Gluteus Maximus Buttocks
Insertion End of muscle attached to the bone undergoing greatest movement
Oblique Diagonal muscle
Synergists Muscles that work together
Antagonists Muscles that work opposite of each other
Intrinsic tongue muscle Changes shape of the tongue
Extrinsic tongue muscle Moves the tongue
Zygomaticus Used for smiling
Belly of a muscle Between Origin and insertion
Flexor Flexes a muscle
Orbicular Oculi Closes eyelid
Depressor Anguli Oris Frowning muscle
Gastocnemius Bigger bulge of the calf muscle
Soleus Smaller bulge of calf muscle
Biceps Brachii Muscle on the anterior side of the arm
Triceps Brachii Muscle on the posterior side of the arm
Deltoid Muscle on the shoulder
Pectoralis Major Upper chest muscle
Sernocleidomastoid Neck muscles
Rectus Abdominis Abdominals
Trapezius Muscle on your back in the shape of a trapezoid
Latissimus Dorsi "Swimmers muscle" Muscle to the left of your spine
Hamstring Posterior thigh muscle
Quadriceps Anterior thigh muscle
Mastication Chewing
Masseter Muscle in the jaw used for chewing
Muscle twitch Contraction of an entire muscle in response to a stimulus
Fasiculi Muscle composed of numerous bundles
Created by: Mmetz921



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