BIO 230 - Lesson 7:
Cardiology test
questions fully solved
2025
Cardiac cycle
pattern of electrical impulses in the heart that results in the
mechanical contraction and relaxation of the myocardium
Electrocardiogram (EKG)
the recording of the cardiac cycle is called?
leads
recordings of heart activity from several angles around the heart
Lead 1
voltage difference from the left arm (positive) to the right arm
(negative). Horizontal of ZERO degrees
Lead 2
voltage difference from the left leg (positive) to the right arm
(negative). 60-degree orientation.
Lead 3
voltage difference from the left leg (positive) to left arm (negative).
120 degree orientation
Einthoven's triangle
the three basic leads make up what?
10 electrodes and 12 leads
A standard EKG uses ____electrodes and ____ leads that view the
heart at 30 degree increments in the vertical plane and horizontal
plane
, up
depolarization towards the positive electrode makes the trace go?
down
Depolarization away from the positive electrode makes the trace
go?
down
repolarization toward positive electrode makes the trace go?
up
repolarization away from the positive electrode makes the trace go?
intervals or segments
the spaces between the peaks are called?
heart rate
The longer or shorter the T-P interval is affects/shows what?
Sinus rhythm
any cardiac rhythm in which the depolarization begins at the
sinoatrial node
arrhythmia
deviation from the normal sinus rhythm of the heartbeat
conduction problems (blocks)
what prevents the spread of an electrical impulse
myocardial infarction (heart attack)
death of cardiac tissue due to lack of oxygen.
mean electrical axis
Average direction of ventricular depolarization during the cardiac
cycle
3
An EKG is performed by attaching at least ___ electrodes to specific
points of the body.
leads I, II, and II
Cardiology test
questions fully solved
2025
Cardiac cycle
pattern of electrical impulses in the heart that results in the
mechanical contraction and relaxation of the myocardium
Electrocardiogram (EKG)
the recording of the cardiac cycle is called?
leads
recordings of heart activity from several angles around the heart
Lead 1
voltage difference from the left arm (positive) to the right arm
(negative). Horizontal of ZERO degrees
Lead 2
voltage difference from the left leg (positive) to the right arm
(negative). 60-degree orientation.
Lead 3
voltage difference from the left leg (positive) to left arm (negative).
120 degree orientation
Einthoven's triangle
the three basic leads make up what?
10 electrodes and 12 leads
A standard EKG uses ____electrodes and ____ leads that view the
heart at 30 degree increments in the vertical plane and horizontal
plane
, up
depolarization towards the positive electrode makes the trace go?
down
Depolarization away from the positive electrode makes the trace
go?
down
repolarization toward positive electrode makes the trace go?
up
repolarization away from the positive electrode makes the trace go?
intervals or segments
the spaces between the peaks are called?
heart rate
The longer or shorter the T-P interval is affects/shows what?
Sinus rhythm
any cardiac rhythm in which the depolarization begins at the
sinoatrial node
arrhythmia
deviation from the normal sinus rhythm of the heartbeat
conduction problems (blocks)
what prevents the spread of an electrical impulse
myocardial infarction (heart attack)
death of cardiac tissue due to lack of oxygen.
mean electrical axis
Average direction of ventricular depolarization during the cardiac
cycle
3
An EKG is performed by attaching at least ___ electrodes to specific
points of the body.
leads I, II, and II
