Cardiac Cycle & Intrinsic Beat Flashcards
SA node stands for…
Sinoatrial node
SA node is found…
In the upper wall of the right atrium
SA node is also called…..
The pacemaker
0.30sec
Atria: diastole Ventricles:Systole
Diastole
Relaxation of the heart
The letters ____________ Are the standard labels used to identify the parts of the EKG
PQRST
0.85sec
Average time of 70 bpm
The heart will beat without any….
Nervous system stimulation, and can be removed from the body and still continue beating
0.40 secs
Atria: Diastole Ventricles:Diastole
AV node is found…
At the bottom of the right atrium near the septum
What are the two locations of nodal tissue in the heart?
SA node and AV node
AV node stands for….
Atrioventricular node
0.15sec
Atria: systole Ventricles: Diastole
What controls the heart beating?
A special type of tissue called the nodal tissue
What has a stronger and longer contraction?
Ventricles
The SA node sends out an ________________ every ______ seconds
Initiatesexcitation impulse , 0.85
Each heartbeat (cardiac cycle) consists of:
Time: Atria: Ventricle:
- 15sec. Systole Diastole
- 30sec. Diastole Systole
- 40sec. Diastole Diastole
0.85sec Average time of 70 bpm
The QRS….
Is the contraction of the ventricles as they drive the blood out into their respective arteries
The T….
Marks the recovery of the ventricles(restoration of the normal electrical conditions, preparing them for the next contraction)
The initiatiatesexcitation impulse sent by the SA node, causes both _________ to contract.
Atria
Why does ventricles have a stronger and longer contraction?
Because blood must be pumped throughout the body
The beat of the heart is
Intrinsic
What is the order of the closing of the valves (lub-dubb)?
First the atrioventricular, than the semi lunar
The impulses sent from the AV node down the purkinje fibres cause what contraction?
Causing both ventricles to contract
The nodal Tissue has both….
Muscular and nervous tissue characteristics
luv-dubb is due to…
The closing of valves
Systole
Contractions of the heart
Contractions of the heart is a ________ Step process
Two
What registers the voltage changes across the surface of the heart as it beats?
And electrocardiogram
When the impulse reaches the AV node an impulse is sent from ______________ , down ________________
From AV node, down the Purkinje fibres
The P curve….
Records the simultaneous contraction of the atria as they drive the blood out into their ventricles
Lub-dubb
Sound of the heart
The initiatesexcitation impulse( SA) is sent to______________ via _______________.
The AV node, via the bundle of His
