6.1 PEx: Cardiovascular Physiology Lab Part 1

Part A

The autorhythmicity of cardiac pacemaker cells is made possible by the reduced permeability of _______.
    sodium
    magnesium
    calcium
    potassium
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Part B

The repolarization of cardiac muscle is due to _______.
    potassium entering the cell
    sodium entering the cell
    sodium exiting the cell
    potassium exiting the cell

Part C

The total refractory period of cardiac muscle _______.
    is shorter than the total refractory period for skeletal muscle
    is longer than the contraction of cardiac muscle
    is longer than the total refractory period for skeletal muscle
    is about the same as the total refractory period for skeletal muscle

Part D

Skeletal muscle is capable of which of the following?
    wave summation
    wave summation and fused tetanus
    fused tetanus
    wave summation, fused tetanus and autorhythmicity
    autorhythmicity