Welcome to the Quiz!
This quiz contains 9 questions from a mix of 1 subtopics.
Which of the following is the correct order of the stages in the cardiac cycle?
ventricular systole, atrial systole, diastole
atrial systole, ventricular systole, diastole
diastole, ventricular systole, atrial systole
atrial systole, diastole, ventricular systole
|
What does NOT happen during ventricular systole?
the ventricles contract
the atrioventricular valves open
the semi-lunar valves open
the atria relax
|
Which of the following is NOT true about diastole?
the pressure in the ventricles increases
the semi-lunar valves close
blood flows passively into the atria
the ventricles and atria relax
|
How is cardiac output calculated?
heart rate + stroke volume
stroke volumeheart rate
heart rate − stroke volume
heart rate × stroke volume
|
Which structure initiates the heartbeat by stimulating the atria to contract?
sinoatrial node (SAN)
purkyne fibres
bundle of His
atrioventricular node (AVN)
|
What is the role of the layer of collagen fibres in the heart?
to initiate the heartbeat
to cause the right and left ventricles to contract from the bottom upwards
to prevent direct electrical flow from atria to ventricles
to conduct the wave of excitation to the heart's apex
|
Which of the following is the correct order of structures that the wave of electrical excitation travels through in the heart?
AVN, Bundle of His, SAN, Purkyne fibres
AVN, SAN, Bundle of His, Purkyne fibres
SAN, AVN, Bundle of His, Purkyne fibres
SAN, Bundle of His, AVN, Purkyne fibres
|
Which of the following is true about the Purkyne fibres?
they cause the right and left ventricles to contract from the bottom upwards
they impose a slight delay in electrical activity
they prevent direct electrical flow from atria to ventricles
they initiate the heartbeat
|
Describe the three main stages of the cardiac cycle and the events that occur during each stage.
|