Physiology 208. U of S

Which of this ions is solely responsible for the depolarization of smooth muscles
Calcium
Sodium
Potassium
Chlorine
Which of this is phosphorylated to activate the serca pump in the cardiac muscle
Phosphalamban
Myosin Light chain
Ryanodine receptor
Voltage gated calcium channels
Which of this will happen to muscle spindles in the absence of gamma neurons
Firing will increase
Firing will decrease
Contraction will increase
Relaxation will increase
Which of this is not a proprioceptors?
Muscle spindles
Golgi tendon organ
Joint receptor
Alpha motor neuron
Based on the size principle, which muscle type is first recruited?
Slow oxidative
Fast-oxidative glyocolytic
Fast glycolytic
All of the above
Depletion of ATP is responsible for peripheral fatigue
True
False
Which of this responds to change in muscle tension
Muscle spinle
Golgi tendon organ
Extrafusal fibers
Intrafusal fibers
Smooth muscles do not require action potential for contraction
True
False
Which of this proteins binds calcium in smooth muscles
Troponin
Calmodulin
Mysoin
Actin
The sympathetic system initiates the depolarization of cardiac muscle through
The phosphorylation of the voltage gated calcium channels
Phosphorylation of ryandoine receptors
Phosphorylation of the regulatory light chain in the mysoin
None of the above
Which of this does not respond to calcium signal directly
Ryanodine recepetor
DHP receptors
Troponin
SERCA pump
Calcium-induced Calcium release from the SR is not important in which of these muscles
Cardaic
Skeletal
Smooth
It is important in all
Which of this changes length during skeletal muscle contraction
H-zone
A-band
M-line
Z-disk
An inactivation of which of this will lead to a complete conduction block in the heart
Bundle of His
Purkinje fibers
AV node
SA node
Which of this is blood flow not directly proportional to
Pressure difference
Radius
Viscosity
A and C
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