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Stack #1104940

What is the ability of skeletal muscle to shorten with force? Contractility
The capacity of skeletal muscle to respond to a stimulus. Excitability
The ability to be streched Extensibility
Ability to recoil to their original resting place after they have been streched. Elasticity
Connective tissue sheath that surrounds each skeletal muscle epimysium
Connective tissue located outside the epimysium. Surrounds and seperates muscles. Fascia
Visible bundles that compose the muscle Fasciculi (Fascicle)
Loose connective tissue that surrounds the fasciciles. Perimysium
Muscle Cells Fibers
Connective tissue sheath surrounding each fiber endomysium
A threadlike structure that extends from one end of the fiber to the other. Myofibrils
Thin myofilaments Actin Myofilaments.
Thick myofilaments Myosin Myofilaments
Units joined end to end forming the myofibril Sarcomere
Basic structural and functional unit of the muscle Sarcomere
Attachment site for Actin Z Line
Light area on each side of the Z Line consisting of actin I Band
Darker central reigon of the sarcomere A Band
Light area in the center of each sarcomere consisting of only myosin H Zone
Center of the sarcomere, a dark staining band M Line
Charge difference across the membrane Resting membrane potential
The brief reversal back of the charge in a cell Action Potential
nerve cells that carry action potentials to skeletal muscle fibers Motor neurons
Each branch that connects to the muscle Neuromuscular Junction or Synapse
25. A single motor neuron and all the skeletal muscle fibers it innervates Motor unit
Enlarged nerve terminal Presynaptic Terminal
The space between the presynaptic terminal and the muscle cell synaptic cleft
Muscle Fiber Postsynaptic Terminal
Secretes a neurotransmitter called acetylcholine Synaptic Vesicles
Neurotransmitter secretion from the synaptic vesicles acetylcholine
Enzymes that break down the the acetylcholine Acetylcholineterase
The sliding of actin myofilaments past myosin myofilaments during contraction sliding filament mechanism
A contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers Muscle twitch
The level at which the muscle fiber will contract maximally Threshold
The phenomenon in which the muscle fibers contrzct maximally All-or-none response
The time between application of a stimulus to a motor neuron and the beginning of a contraction Lag phase
The time of contraction contraction phase
The time during which the muscle relaxes The relaxation phase
Where the muscle remains contracted without relaxing tetany
The increase in number of motor units being activated is called ________ Recruitment
Needed energy for muscle contraction ATP
Produced in mitochondria Atp
43Shortlived and unstable. Dengenerates to _____ plus phosphate ADP
High energy stored molecule stored at rest creatine phosphate
45. Without oxygen Anaerobic respiration
46. With oxygen Aerobic Respiration
47.The amount of oxygen needed in chemical reactions to convert lactic acid to glucose and to replenish the depleted stores of creatine phosphate stores in muscle cells. Oxygen Debt
Results when ATP is used during muscle contraction faster than it can be produced in muscle cells. Muscle Fatigue
The length of the muscle does not change, but the amount of tension increases during the contraction process. Isometric
50. The amount of tension produced by the muscle is constant during contraction, but the length of the muscle changes. Isotonic
Constant tension produced by the muscles of the body for long periods of time. Muscle tone
Contract quickly and fatigue quickly. Fast-twitch fibers
Contract more slowly and are more resistant to fatigue. They are better suited for aerobic metabolism. Slow twitch fibers
The most stationary end of a muscle Origin (head)
The end of the muscle undergoing the greatest movement. Insertion
The portion of the muscle between the origin and the insertion. The belly.
Muscles that work together to accomplish specific movements Synergists
Muscles that work in opposition to one another antagonists
One muscle that plays the major role in accomplishing the desired movement Prime Mover
60.Occiptofrontalis Raises eyebrows
Orbicularis Oculi closes eyelids
Orbicularis Oris Puckers Lips
Buccinator Flattens the Cheek
Zygomaticus Smiling
Leviotao Labii Superiortis Sneering
Depressor Anguli Oris Frowning
Mastication The act of chewing
Muscles involved in chewing: Buccinator, Temporalis, & Masseter
Extrinsic Toungue Muscles Move the tounge
Intrinisic Toungue Muscles Change the shape of the tounge
Prime Mover; Lateral Neck Muscle Sternocleidomastoid
Muscle on each side of the vertebral column Erector Sprine
Elevates ribs during inspiration External Intercostals
Contrasts during forced expiration Internal Intercostals
Dome shaped muscle that seperates thoracic cavity from abdominopelvic cavity Diaphram
How are muscles named? Location, size, orientation of fibers, shape, origin, insertion, and function.
Which part of the muscle undergoes the greatest movement? Insertion
Which part of the muscle is most stationary? Origin;Head
Created by: LaurenWorkman



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