WorksheetsChapter 19 Part 2
Total questions: 9
Worksheet time: 4mins
What node is also known as the ‘pacemaker’?
Bundle of His
Purkinje fibers
Atrioventricular node
Sinoatrial node
What is the term for an abnormally fast heart rate?
Lackofexercisia
Bradycardia
Tachycardia
Coronaria
On an EKG, the QRS spike indicates what process in the heart?
Atrias depolarizing
Ventricles depolarizing
Hesitation at the AV node
A murmur
Which of the following can affect cardiac output?
Hormones
Stroke volume
Sympathetic and Parasympathetic nervous system
All of the above
During rapid depolarization of ventricular cardiac cells, which voltage channels open?
Potassium
Calcium
Troponin
Sodium
When the ventricles contract, the papillary muscles also contract, which
tightens the chordae tendineae preventing the AV valves from prolapsing
tightens the chordae tendineae, causing the AV valves to open
loosens the chordae tendineae, allowing the semilunar valves to open.
loosens the chordae tendineae, allowing the semilunar valves to close.
Bradycardia is:
Irregular heart beat
Low blood pressure
Increase in blood viscosity
Abnormally slow heart rate
During diastole, the ventricular chamber of the heart:
Relaxes and fills with blood
Contracts and pushes blood out
Experiences a sharp increase in pressure
Reaches a pressure of approximately 120 mmHg
In the action potential of a myocardial cell, the Ca2+ gates close:
at threshold
just as the cell begins to depolarize
at the end of the plateau
at the end of repolarization
