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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.
What are four major functional characteristics of skeletal muscle? contractility, excitability, extensibility, and elasticity.
What do muscles help produce? heat essential for maintenance of normal body temperature.
Each skeletal muscle is surrounded by a connective tissue sheath called? epimysium
Is another connective tissue located outside the epimysium. fascia
A muscle is composed of numerous visible bundles called fasciculi(fascicle), which are surrounded by loose connective tissue called? perimysium
The fasciculi are composed of single muscle cells called? fibers
Each fiber is surrounded by a connective tissue sheath called the? endomysium
The cytoplasm of each fiber is filled with? myofibrils
What are myofibrils? A threadlike structure that extends from one end of the fiber to the other.
Myofibrils consists of what two major kinds of protein fibers? Actin myofilaments and myosin myofilaments.
Actin and myosin myofilaments form highly ordered units called? sarcomeres.
What are actin myofilaments? thin myofilaments. They resemble 2 minute strands of pearls twisted together.
What are myosin myofilaments? thick myofilaments. They resemble bundles of minute golf clubs.
What is a sarcomere? the basic structural and functional unity of the muscle.
Each sarcomere extends from what? from one Z line to another Z line.
On each side of the Z line is a light area called what? I band
What does the I band consist of? actin
The A band extends what? the length of the myosin.
What is the darker central region in each sarcomere? the A band.
In the center of each sarcomere is another light area called what? the H zone.
What does the H zone consists of? It consists of only myosin
The myosin myofilaments are anchored in the center of the sarcomere at a dark staining band called the? M line.
The charge difference across the membrane is called the? resting membrane potential.
The brief reversal back of the charge is called? action potential
What are motor neurons? Are nerve cells that carry action potentials to skeletal muscle fibers.
What do axons enter? the muscles and branch
Each branch that connects to the muscle forms a ? neuromuscular junction or synapse
A single motor neuron and all the skeletal muscle fibers it innervates are called a ? motor unit
What is a neuromuscular junction formed by? an enlarged nerve terminal resting in an indentation of the muscle cell membrane.
The enlarged nerve terminal is the? presynaptic terminal
The space between the presynaptic terminal and the muscle cell is the? synaptic cleft
Each presynaptic terminal contains what? synaptic vesicles.
Synaptic vesicles secretes a neurotransmitter called what? acetylcholine.
What diffuses across the synaptic cleft and binds to the postsynaptic terminal causing a change in the postsynaptic cell? acetylcholine
Created by: alysongue1