CH 3 Basic Electrophysioloy

Question 0

Responsible for controlling the rate and rhythm of the heart by coordinating regular depolarization and are found in the electrical conduction system of the heart

Answer 0

Specialized Group

Question 1

responsible for generating the physical contraction of the heart muscle

Answer 1

Myocardial Working Cells

Question 2

the ability of cardiac pacemaker cells to generate their own electrical stimulus impulses spontaneously without external ( or nervous) stimulation

Answer 2

Automaticity

Question 3

the ability of cardiac cells to respond to an electrical stimulus, a characteristic shared by all cardiac cells

Answer 3

Excitability

Question 4

(also referred to as rhythmicity) is the ability of cardiac cells to shorten and cause cardiac muscle contraction in response to an electrical stimulus

Answer 4

Contractility

Question 5

A substance or compound whose molecules dissociate into charge components, or ions, when placed in water, producing positively and negatively charged ions

Answer 5

electrolyte

Question 6

An ion with a positive charge

Answer 6

Cation

Question 7

An ion with a negative charge

Answer 7

Anion

Question 8

State of cardiac cell in which the inside of the cell membrane is negative compared with the outside of the cell membrane; exists when cardiac cells are in the resting state

Answer 8

Resting Membrane Potential

Question 9

Change in polarity; a five phase cycle that produces changes in the cell membrane’s electrical chacrge; caused by stimulus of myocardial cells which extends across the myocardium; propagated in all or none fashion

Answer 9

Action Potential

Question 10

Cardiac muscle cell groups that are connected together and function collectively as a unit

Answer 10

Syncytium

Question 11

resting state of cardiac cell membrane to change to allow the movement of ions

Answer 11

Polarized State

Question 12

The ability of cell membrane to change to allow the movement of ions

Answer 12

Permeability

Question 13

Electrical occurrence normally expected to result in myocardial contraction; involves the movement of ions across cardiac cell menbranes, resulting in positive polarity inside the cell membrane

Answer 13

Depolarization

Question 14

Process whereby the depolarized cell is polarized and positive charges are again on the outside and negative charges on the inside of the cell; return to the resting state

Answer 14

Repolarization

Question 15

stage of cell activity in which the cardiac cell cannot spontaneously depolarize

Answer 15

Absolute Refractory Period

Question 16

The period when repolarization is almost complete and the cardiac cell can be stimulated to contract prematurely if the stimulus is much stronger than normal

Answer 16

Relative Refractory Period