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Anatomy Flash Cards'

Anatomy - Eastham

QuestionAnswer
Contractility? Ability to shorten with force.
Gluteous maximus Buttox
Excitability? The ability to be stretched.
Elasticity? Ability to recoil to their original resting length after they have been stretched.
The skeletal muscle sheath inside the fascia? The epimysium.
Located outside the epimysium? The Fascia.
Surrounds the fascicle. The perimysium.
Surrounds each muscle fiber. The endomysium.
The cytoplasm of each fiber is filled with threadlike structures that extend from one end of the fiber to the other are called? myofibrils.
The two kinds of major myofibrils are? actin myofilaments, and myosin myofilaments
Actin and myosin myofilaments form highly ordered units called...? sarcomeres.
Each sarcomere extends from one of these to another Z-Line
The outside of most cell membranes are positively charged, as opposed to their negatively charged inside, this is called? resting membrane potential.
When a muscle cell is stimulated, the positive and negative characteristics switch briefly. This is called...? Action potential.
Nerve cells that carry action potentials to skeletal muscle fibers motor neurons
An axon enters a muscle and a branch, The branch that connects to the muscle is called...? neuromuscular junction, or synapse.
A single motor neuron and all the skeletal muscle fibers it innervates are called...? A motor unit.
The enlarged nerve terminal in the synapse is called the...? presynaptic terminal
The space between the presynaptic terminal and the muscle cells is the...? Synaptic cleft.
The muscle fiber between the presynaptic terminal and the synaptic cleft is the...? postsynaptic terminal.
Each synaptic terminal contains? Synaptic vesicles.
synaptic vesicles excrete a neurotransmitter called...? acetylcholine.
Occurs when myosin and actin myofilaments slid past each other causing sarcomeres to shorten. This process is called? Sliding Filament Mechanism
a contraction of an entire muscle in response to a stimulus that causes the action potential of one or more muscle fibers is called? Muscle Twitch.
A muscle fiber will not respond to a stimulus until said stimulus hits its what? Threshold.
The threshold phenomenom is called the...? all or nothing response.
The time between application of a stimulus to a motor neuron and the beginning of the lag phase is called...? The lag phase.
The time of the contraction is called...? The contraction phase.
The time in which the muscle relaxes is the? Relaxation phase.
When the muscle remains contracted without relaxing is called? Tetany, AKA Tetanous.
The increase in motor units activating is called... Recruitment.
Energy needed for muscle contraction is called... ATP (adenosine triphosphate)
ATP is produced where? In the mitochondria.
ATP degenerates into what? ADP (Adenosine diphosphate)
When muscles are at rest, they cannot stockpile ATP, but can stockpile another kind of high energy molecule, called? creatine phosphate.
Anaerobic respiration occurs with or without oxygen? Without oxygen.
Aerobic respiration occurs with or without oxygen? With oxygen.
Muscle fatigue results when? When ATP is used during muscle contraction faster than in can be produced by muscle cells.
The length of the muscle doesn't change, but the amount of tension increases during the contraction process is called? isometric.
The length of the muscle changes, but the tension stays the same. Isotonic.
Muscle tone refers to what? The constant tension produced by muscles of the body for long periods of time. Keeps the head up, and the back straight.
Fast twitch fibers do what? Contract quickly and fatigue quickly.
Slow twitch fibers do what? Contract more slowly and are more resistant to fatigue.
The origin (head) is the most stationary or the most active end of the muscle? Stationary.
The insertion is the most active or the most stationary end of the muscle. Active.
The portion of the muscle in between the origin and insertion is called? The belly.
Muscles that work together to accomplish a specific goal are called? Synergists.
Muscles that work in opposition of each other are called? Antagonists.
Among a group of synergists, if one muscle muscles plays the major role in accomplishing the desired movement, it is called? The prime mover.
Created by: tjedwards93