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Michael Metzger
Chapter 6 Muscles
Question | Answer |
---|---|
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 |