Muscular System Flashcards
What is the Voluntary Striated Muscle?
A Muscle Under Control of the Conscious Mind.
What is the Epimysium?
A Well-Defined Group of Muscle Cells Surrounded by a Fibrous Connective Sheath.
What is the Origin of the Muscle?
A Stable Skeletal Muscle Attachment Site.
What is the Insertion of the Muscle?
The Site that Undergoes Most of the Movement When the Muscle Contracts.
What are the Inspiratory Muscles?
Muscles that Increase the Size of the Thoracic Cavity when they Contract.
What are Expiratory Muscles?
Muscles that Decrease the Thoracic Cavity Size.
What are Fibers?
They are Skeletal Muscle Cells.
What is the Sarcolemma?
It is a Muscle Cell Membrane.
What is the Sarcoplasmic Reticulum?
A Storage Organelle for Calcium Ions.
What are Transverse Tubules?
Also Known as T-Tubules, A System of Tubules that Extend in From the Sarcolemma.
What is a Sarcomere?
A Basic Contracting Unit of Skeletal Muscle. There are Many Laid End to End in one Myofibril.
What is a Z Line, or Z Disc?
Each Sarcomere has a Z Line on Each End. They Share the Lines.
What is an Actin?
Thin Protein Filaments that Attach to the Z Lines and Extend to the Center of the Sarcomere. However, they Don’t Meet.
What is a Myosin?
Think Protein Filaments and Float in the Middle of the Sarcomere Between Parallel Actin Fibers.
What are I Bands?
Made up of Thin Actin Filaments. Each Band Extends from One Sarcomere Across the Z Line to the Beginning of the Myosin Fibers in the Next Sarcomere.
What are A Bands?
Areas Where Thick Myosin Filaments and Thin Actin Filament Overlap.
What are the H Band?
The Light-Colored Area Located in the Middle of the A Band. It is Made Up of Myosin Filaments Only, With No Overlapping Actin Filaments.
What is the Neuromuscular Junctions?
Sites Where the Ends of Motor Nerve Fibers Connect to Muscle Fibers.
What is the Definition of the Motor Unit Term?
Describes One Nerve Fiber and All the Muscle Fibers and it Innervates.
What is the Endomysium?
A Delicate Connective Tissue Layer that Surrounds Each Individual Skeletal Muscle Fiber. It is Made of Fine, Reticular Fibers.
What are Fascicles?
Group of Skeletal Muscle Fibers Bounded by the Perimysium.
What is the Perimysium?
A Tough Connective Tissue Layer, Composed of Reticular Fibers and Thick Collagen Fibers.
What is the Epimysium?
A Fibrous Connective Tissue Layer Composed Largely of Tough Collagen Fibers. It is the Outer Covering of the Entire Muscles.
What is Involuntary Muscle?
The Contractions are Not Under Conscious Control.
