Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/51

Click to flip

51 Cards in this Set

  • Front
  • Back
What is a myofiber?
An entire muscle cell
What do myofibers in skeletal muscle look like?
Large eosinophilic polygonal structures with basophilic nuclei.
Where are the nuclei of skeletal muscle fibers located?
Peripherally
What connective tissue surounds individual myofibers?
Endomysium
What is the light pink wispy material that may be within endomysium?
Collagen
What structures may be within endomysium?
Capillaries
What type of epithelium lines capillaries?
Simple squamous
What type of epithelium lines the lumen of this pharynx?
Stratified squamous
What are the groups of myofibers that occur in muscle called?
Fascicles
What surrounds fascicles?
Perimysium
What structures can be found in perimysium?
Arterioles
Venules
Nerves
what surrounds an entire muscle?
Epimysium
What is epimysium?
Fascia
What is another name for the nuclei that are located peripherally in skeletal muscle?
Myonuclei
How many nuclei are associated with each skeletal muscle myofiber?
Many
Do skeletal muscle myofibers normally branch?
No
What shape are myofibers?
Cylindrical
What is the ultrastructure of a myofiber?
ZIAH
What is the Z line?
Where actin is attached
What is the I band?
Only light chains
What is the A band?
Overlapping Light and Heavy
What is the H band?
Only Heavy
What does a thick filament consist of?
Myosin
3 components in Thin filaments:
-Actin
-Troponin
-Tropomyosin
What is a contractile unit of striated muscle from one z line to the next called?
Sarcomere
What band decreases in width during a contraction?
I band
What is released at the NMJ of a skeletal muscle?
ACh
What are the cells that generate myoblasts?
Satellite cells
Where are satellite cells located in muscle?
Between the basal lamina and plasma membrane of the myocyte.
What is a Neuromuscular Spindle?
A stretch receptor
What special muscle structures are within neuromuscular spindles?
Intrafusal fibers
What is unique about intrafusal fibers?
They are surrounded by a capsule
Where within a whole muscle are intrafusal fibers found?
In the perimysium
What do neuromuscular spindles do for muscle?
regulate its tone
What are the 3 levels of esophagus?
Upper 1/3 - skeletal
Middle 1/3 - mixed
Lower 1/3 - smooth
What is the diameter of smooth muscle fibers like in a cross section?
Variable
Where are the nuclei in smooth muscle fibers?
Central
What shape are smooth muscle cells?
Spindle shaped
How many nuclei are associated with each smooth muscle myofiber?
1
What type of muscle is in the ductus deferens?
Smooth
What type of muscle is in the cremaster muscle?
Skeletal
What do nuclei look like in the ductus?
Elongated - cigar shaped
What type of muscle lines blood vessels?
Smooth
What is cardiac muscle more similar to in longitudinal views?
Skeletal - it's striated
How many nuclei are associated with each cardiac myocyte?
1-2
Do cardiac muscle myofibers normally branch?
Yes
Where are cardiac myofiber nuclei located?
Centrally
What structure joins myofibers?
Intercalated disks
What 2 structures make up intercalated disks? In what part?
Gap junctions (LATERAL)
Fascia Adherens (transverse)
What is the function of intercalated disks?
Cell adhesion
Electrical coupling
Why is a cross section of cardiac myofibers so variable?
Because they branch.