CH 3 Basic electrophysiology

Question 1

responsible for generating the physical contraction of the heart muscle

Answer 1

Myocardial Working Cell

Question 2

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 2

Specialized Group

Question 3

The ability of cardiac pacemaker cells to generate their own electrical impulses spontaneously with out external ( or nervous stimulation)

Answer 3

Automaticity

Question 4

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

Answer 4

Excitability

Question 5

Ability of cardiac cells to receive an electrical stimulus and then transmit it to other cardiac cells

Answer 5

Conductivity

Question 6

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

Answer 6

Contractility

Question 7

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

Answer 7

Electrolyte

Question 8

An ion with a positive charge

Answer 8

Cation

Question 9

An ion with a negative charge

Answer 9

Anion

Question 10

One of Three major cations that affect cardiac function. with Magnesium(Mg) and Calcium(Ca) these are intracellular ( inside the cell) cations. plays a major function in cardiac depolarization and depolarization. increase in bllod levels of this is called (hyperkallemia) a decrease (hypokalemia)

Answer 10

Potassium (K)

Question 11

One of Three major cations that affect cardiac function. Plays a vital part in depolarization of the myocardium. an increas in _____ blood levels (hypernatremia). a decrease in blood level of _____ is called ( Hyponaterimia)

Answer 11

Sodium (Na)

Question 12

One of Three that affect cardiac function. with Magnesium(Mg) and major cations Sodium(Na) these are intracellular ( inside the cell) cations.
has an important function in myocardial depolarization and myocardial contraction an increase of this in blood levels in known as ( hypercalcemia. a deficit is known as
( hypocalcemia)

Answer 12

Calcium (Ca)

Question 13

Also a major cations affect cardiac function. With this Potassium (K) and Calcium(Ca) these are intracellular ( inside the cell) cations.

Answer 13

Magnesium (Mg)

Question 14

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

Answer 14

Resting Membrane Potential

Question 15

A change in polarity; a five-phase cycle that produces changes in the cell membrane’s electrial charge; cased by stimulation of myocardial cells which extend across the myocardium; propagated in all-or-nothing fashion

Answer 15

Action Potential

Question 16

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

Answer 16

Syncytium

Question 17

Resting state of a cardiac cell, wherein the inside of the cell is electrically negative relative to the outside of the cell

Answer 17

Polarized State

Question 18

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

Answer 18

Permeability

Question 19

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

Answer 19

Depolarization

Question 20

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

Answer 20

Repolarization

Question 21

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

Answer 21

Absolute Refractory Period

Question 22

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 22

Relative Refractory