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

1/25

Click to flip

25 Cards in this Set

  • Front
  • Back
Functions of muscle
Movement
Posture
Joint Stability
Heat production
Muscle tissu exhibits
Excitability
contractility
extensibility
elasticity
Types of muscle
Skeletal
Cardiac
Smooth
Skeletal muscle is _________________ , usually attached to bone
voluntary striated muscle
Skeletal muscle exhibits ___________
striations
During muscle contraction, the muscle generates ____________ , followed by ___________ that moves the load
internal tension
external tension
The plasma membrane is the ___________
sarcolemma
It has transverse (T) __________
tubules
________________ are made of myosin, shaped somewhat like a golf club
Thick myofilaments
The _________________ are made up of fibrous actin with bead-like subunits of globular actin
thin myofilaments
Action potentials in the ___________ give rise to action potentials in the ____________
nerve fiber
muscle fiber
Nerve cell releases ___ into the _____________
Ach
synaptic cleft
Ach attaches (binds) to ___________ of the surface of the muscle cell
Ach receptors
Ach opens ____________ channels in the cell membrane (depolarization begins)
K+ and Na+
The action potential spreads down _____________ and into the interior of the muscle cell
the T-tubules
Depolarization along the T-tubules results in a release of Ca+ from the terminal cisternae. Ca+ diffuses into the ____________
sarcoplasm
Ca+ attaches to __________ on the thin filaments
troponin
Ca+ binding to troponin causes ___________ to move, revealing ____________ sites on each actin monomer
tropomyosin
myosin binding
Prior to activation the myosin head must be activated by “burning” ________________________
the ATP molecule attached to it
Myosin then attaches to the _________________
thin filament (actin)
As soon as myosin attaches to ___________ it initiates a power stroke that pulls the thin filament along the thick filament
actin
To detach myosin, ___________ to the myosin head
ATP must bind
The myosin head can then either ________________ or ______________________
reattach and pull again
enter relaxation
When the stimulus from the nerve stops ________________________________ and back into the sarcoplasmic reticulum
Ca+ diffuses out of the sarcoplasm
The removal of Ca+ causes __________________ to return to their original shape and position
troponin and tropomyosin