Heart Health Quiz
Heart Health Quiz
Test your knowledge about the human heart and cardiovascular system with our comprehensive quiz! This engaging quiz features 20 multiple-choice questions designed to challenge your understanding of heart fun
Whether you're a student, a teacher, or simply someone interested in medicine, you can:
- Enhance your cardiovascular knowledge
- Learn about heart anatomy and fun
ction - Understand important medical concepts related to heart health
An artificial pace maker is implanted and connected to the heart in patients........
Suffering from arteriosclerosis
Having high blood pressure
With irregularity in heart rhythm
having 90% blockage
Heart beat initiates from?
Purkinji fibers
SA node
Bundle of HIS
Which phase of the cardiac cycle follows immediately after the beginning of the QRS wave?
Isovolumic relaxation
Ventricular ejection
Isovolumic contraction
Atrial systole
In which phase of the ventricular muscle action poten- tial is the potassium permeability the highest?
1
2
3
0
Which event is associated with the first heart sound?
Closing of the aortic valve
Closing of the A-V valves
Opening of the A-V valves
Which of the following structures will have the slowest rate of conduction of the cardiac action potential?
A-V bundle fibers
Purkinje fibers
Ventricular muscle
Anterior internodal pathway
Which instrument is used to listen to the internal sounds of the human body?
Suction device
Reflex hammer
Stethoscope
SA node has contractile activity in addition to its conductivity ?
True
False
The sinoatrial node depolarizes more frequently under the influence of
Acetylcholine
Medulla oblongata
vagus nerve
norepinephrine
Cardiac output is determined by
Heart rate
Stroke volume
Blood flow
heart rate and stroke volume
Which of the following is most likely to cause the heart to go into spastic contraction?
A) Increased body temperature
B) Increased sympathetic activity
C) Excess extracellular fluid potassium ions
D) Excess extracellular fluid calcium ions
What happens at the end of ventricular isovolumic re- laxation?
The mitral valve opens
The pulmonary valve closes
The aortic valve closes
2. Which of the following has the thickest wall?
Left atrium
Right atrium
Left ventricle
Right ventricle
Blood enters into the heart because of muscles of _____
Atria contract
Atria relax
Ventricles relax
If the S-A node discharges at 0.00 seconds, when will the action potential normally arrive at the epicardial surface at the base of the left ventricle?
0.22 second
0.12 second
.09 second
0.12 second
Which condition at the A-V node will cause a decrease in heart rate?
Increased calcium permeability
Increased potassium permeability
Increased norepinephrine level
Decreased acetylcholine levels
Which statement best explains how sympathetic stimulation affects the heart?
The permeability of the S-A node to sodium decreases
The permeability of the A-V node to sodium decreases
There is an increased rate of upward drift of the resting membrane potential of the S-A node
The permeability of the S-A node to potassium increases
What is the membrane potential (threshold level) at which the S-A node discharges?
�40 millivolt
−65 millivolt
�105 millivolt
−55 millivolt
If the Purkinje fibers, situated distal to the A-V junc- tion, become the pacemaker of the heart, what is the expected heart rate?
80/min
70/min
50/min
30/min
A 60-year-old man’s ECG shows that he has an R-R interval of 1.5 seconds at rest. Which statement best explains his condition?
He has normal polarization of the S-A node
He is a trained athlete at rest
He has decreased parasympathetic stimulation of the S-A node
He has a normal heart rate
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