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What is the Sarcolema , Sarcoplasm , and Sarcoplasmic Reticulum ?
SARCOLEMA (CELL MEMBRANE)
SARCOPLASMIC RETICULUM (E.R) -The special type of smooth endoplasmic reticulum found in smooth and striated muscle fibers whose function is to store and release calcium ions.The sarcoplasmic reticulum releases calcium ions during muscle contraction and absorb them during relaxation.
What muscles have intercalated discs ?
Cardiac and skeletal
What muscle exhibits a fusiform appearance ?
What is hypertrophy and hyperplasia ?
- Hypertrophy -is the enlargement of a cell
- Hyperplasia - is the increase of cell number
What muscle is multinucleated :fusion of embryonic mononucleated myoblasts and have the nuclei hypolemally placed ?
Explain Endomysium , Perimysium , and Epimysium ?
Endomysium - it covers individual muscle fibers
Perimysium - covers muscle fiber bundles
Epimysium - covers the entire muscle
When referring to the "motor end plate" or myoneural junction explain the following ?
Terminal non-myelinated motor nerves
Which bands are anisotropic and isotropic ? What does the Z-line represent ?
- A Band - anisotropic
- I Band -isotropic
Z-line - sacromere
What makes up myosin ?
- heavy chains
- light chains
- ATPase activity
- Cross Bridges
- Meromysin (light and heavy chains )
What makes up Actin ?
- Alpha Actinin
- Toponin (TnT , TnI , TnC )
What is the function of the Transverse tubule system ?
These tubules allow for a uniform contraction of the muscle
Discuss the process contraction of a muscle from the neuromuscular junction ?
Neurotransmitter- ACH > Transverse Tubules > Sarcoplasmic reticulum -release Ca > Removes troponin from the tropomyosin > myosin attaches to actin > Powerstroke of myosin begins > Ca is reabsorbed by the Sarcoplasmic reticulum
Branching fibers , Striations , Intercalated discs , Box car , and central nucleus are attributes of what type of muscle ?
Purpose of the Zonula adherens ?
Purpose of Macula adherens (desmosomes) ?
Purpose of Gap Junction ?
Zonula -It is to anchor actin filaments in the
Macula -bind cells together for contraction
Gap Junction - ionically couple cells and provide for spread of contractile depolarization
These characteristics are for what type of muscle ?
Fusiform fiber , Single Central nucleus , Myofibrils , Dense bodies for insertion of myofilaments , basal lamina , gap junctions, Involuntary movement
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