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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 |
Created by:
Mmetz921