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Chapter 6 muscles

Contractility. The ability of skeletal muscle to shorten with force.
Excitability. The capacity of skeletal muscle to respond to a stimulus.
Extensibility. The ability to be stretched.
Elasticity. Ability to recoil to their original resting length after they have been stretched.
The skeletal muscle is surrounded by a connective tissue sheath called? The epimysium.
Another connective tissue located outside epimysium, surrounds and separates muscles. Fascia.
Loose connective tissue that surrounds muscle fasciculi. Perimysium.
Threadlike structure that extends from one end of the fiber to the other. Myofibirils.
2 major kinds of protein fibers. Actin, and myosin.
Basic structural and fuctional unity of a muscle. Sacromere.
Charge distance across the membrane. Resting membrane potential.
Brief reversal back of the charge. Action potential.
Nerve cells that carry action potentials to skeletal muscle fibers. Motor neurons.
Branch that connects to muscles. Neuromusclular junction or synapse.
Single motor neuron and all the skeletal muscle fibers it innervates. Motor Unit.
Enlarged nerve terminal. Presynaptic terminal.
Space between presynaptic terminal and muscle cell. Synaptic cleft.
Actin slides past myosin during contraction. Sliding filament mechanism.
Contraction of an entire muscle in response to a stimulus. Muscle twitch.
Level the muscle fiber responds to stimulus. Threshold.
Muscle fiber contacts maximally. All-or-None response.
Time between application of a stimulus to a motor neuron and beginning of a contraction. Lag phase.
Time of contraction. Contraction phase.
Time during the muscle relaxes. Relaxation phase.
Muscle remains contracted without relaxing. Tetany.
Increase in number of motor units being activiated. Recruitment.
ATP full name. Adenosine triphosphate.
Where ATP is produced Mitochondria.
ATP degenerates to. ADP
ADP full name Adenosine diphosphate.
Another high-energy molecule. Creatine phosphate.
Anaerobic respiration. Occurs without oxygen.
Aerobic respiration. Occurs with oxygen.
Amount of oxygen needed in chemical reactions to convert lactic acid to glucose. Oxygen debt.
When ATP is used faster than produced. Muscle fatigue.
Length of muscle does not change, amount of tension increases. Isometric.
Tension is constant, but length changes. Isotonic.
Constant tension produced by muscles of body for long periods of time. Muscle Tone.
Contracts quickly and fatigues quickly. Fast-twitch fibers.
Contracts more slowly and more resistant to fatigue. Slow-twitch fibers.
Most stationary end of the muscle. The origin.
End of muscle undergoing greatest movement. Insertion.
Portion of muscle between origin and insertion. Belly.
Some muscles have multiple of Origins.
Muscles that work together to accomplish specific movements. Synergists.
Muscles that work in opposition to one another. Antagonists.
If one muscles plays major role in accomplishing desired movement. Prime mover.
What muscles help produce. Heat.
Muscle is composed of visible bundles called. Fasciculi.
Cytoplasm of each fiber is filled with. Myofibrils(2)
Sacromeres are formed by. Actin and myosin myofilaments.
Sacromere extends to and from. Z line to Z line.
Light area around Z line I band.
I band consists of. Actin.
Darker region in sacromere. A band.
Light area in center of sacromere. H zone.
H zone consists of. Myosin.
Dark straining band in center of a sacromere. M line.
M line is. myosin myofilaments.
Charge of outside of most cell membranes. Positive.
Charge of inside cell membrane. Negative.
synaptic vesicles secrete neurotransmitter called. Acetylcholine.
Fixators. Specialized synergists, holds a bone still or stabilize origin of a prime mover.
Tongue Muscles. Intrensic, Extrensic.
4 Muscle Functions Produces Movement, Maintains posture, stabilizes joints, and generates heat.
Important Muscle Fiber organelle. Sacroplasmic Reticulum.
What axons branch into. Axon Terminal.
Fusiform. A modification of the parallel arrangement.
Muscle that covers the frontal bone. Frontalis.
Zygomaticus. Smiling muscle.
Two-headed muscles. Sternocleidomastoid.
Pectoralis Major. Large fan-shaped muscle covering upper part of chest.
Upper limb muscle groups. Arm, Forearm, Wrist.
Lower limb muscle groups. Thigh, Leg, Ankle
3 Trunk muscles. Pectoralis major, rectus abdominis, external oblique.
Created by: Darkriderheir



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