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Physiology Ch. 10

Skeletal Muscle

TermDefinition
Functions of skeletal muscle: Body movement, posture, protection and support, heat production, and regulation of elimination of materials
Characteristics of skeletal muscle: Excitable, conductive, contractility, extensibility, and elasticity (going back to normal)
A _____ is a muscle cell. Muscle fiber
Fascicles Bundles of muscle fibers
Muscle fibers have lots of _____ to make lots of ____. Mitochondria, ATP
Sarcomere Contractile unit of muscle fibers, going from Z line to Z line
Skeletal muscles are innervated by _____ neurons. Lower motor
Sarcoplasm Cytoplasm of muscle cell
Sarcolemma Plasma membrane of muscle, containing T-tubules with Ca2+ channels. Connects to sarcoplasmic reticulum
Sarcoplasmic reticulum ER of muscle cell that contains Ca2+, which are released in response to action potential conducting via T-tubules
All skeletal muscle neuromuscular junctions are _____. Excitatory
Motor end plate Ruffled part of muscle in the neuromuscular junction, containing Na+ channels that are activated by ACh
Neuromuscular junction (NMJ) LMN communicating to muscle (motor end plate)
RMP of muscle -90 mV
Action potential at neuromuscular junction ACh released and received, causing Na+ channels to open to let into cell. Signal carries across T-tubule to open Ca2+ channels of sarcoplasmic reticulum to open so muscles can contract.
Axonal collaterals Places on muscle were LMN is connected to
Motor unit Motor neuron and all muscle fibers it controls. When one fiber is excited, so are the rest
Muscle neurons hit the _____ of the fiber, and travels ____ ____ along it. Middle, both ways.
NMJ neurons are always ______. Excitatory
Nervous system synapses can be ____ or ____. Excitatory, inhibitory
Created by: RunningMads
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