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

Physiology 208. U of S

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