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Jillian Jackson

Anatomy Chapter 6 Study Stack 7/8

QuestionAnswer
Muscle cells Muscle Fibers
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 stretched Extensibility
Recoil to their original resting length after they have been stretched Elasticity
Each skeletal muscle is surrounded by a connective tissue sheath Epimysium
Another connective tissue located outside the epimysium. (surrounds and seperates muscles.) Fascia
A muscle is composed of numerous visible bundles Muscle fasciculi
Fasciculi is surrounded by loose connective tissue Perimysium
The fasciculi is composed of single muscle fibers Fibers
Each fiber is surrounded by a connective tissue sheath Endomysium
Myofibrils consist of 2 major types of protien fibers Actin myofilaments and myosin myofilaments
Thin myofilaments Actin
Thick myofilaments Myosin
Actin and myosin filaments form highly ordered units Sarcomeres
Basic structural and functional unity of the muscle Sarcomere
Four Major Functional Characteristics Contractility, excitability, extensibility, elasticity.
Each sarcomere extends from one Z line to Another Z line
Each Z line is an attachment site for Actin
Each side of the Z line is a light area called _______, it consists of actin I band
In the center of each sarcomere is another light area called the ___________, which consists of myosin H zone
The myosin myofilaments are anchored in the center of the sarcomere at a dark staining band called the __________. M line
The change difference across the membrane. Resting membrane potential
The brief reversal of the charge. Actin potential
Nerve cells that carry actin potentials to skeletal muscle fibers Motor neurons
Each branch that connects to the muscle forms a ________________, or __________ near the center of the cell Neuromuscular junction; synapse
Created by: svhs12
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