Stricture Of The Heart Flashcards
What is the heart enclosed in?
A pericardial sac.
What is the human heart?
A four-chambered muscular organ.
Looking at a picture of a basic heart diagram what is on the right hand side?
left atrium at the top & the left ventricle at the bottom
Looking at a basic diagram of the heart what is on the left hand side?
Right atrium at the top & right ventricle at the bottom
What do veins do?
Take blood back to the heart.
What are the two atria’s?
thin-walled chambers that receive blood from the veins.
why do the two ventricles have thicker walls?
because the blood pumps with more pressure.
What is systole?
where the muscle chambers of the heart contract
What is diastole?
where the muscle chambers of the heart relax
When the atrium systole contracts (squeezing blood into ventricles) what do the ventricles do?
Relax (diastole)
When ventricles systole they squeeze blood into the arteries taking blood away from the heart, what do the atriums then do?
Relax (diastole)
When atriums are full, what are ventricles?
Empty
When ventricles are full, what are atriums?
Empty
There are trapdoors between Atriums and Ventricles, what are they called?
Tricuspid & bicuspid. (Tri before you Bi)
What does the septum do?
Separate the tricuspid and bicuspid valves.
When atriums fill up, a signal is sent down what?
The septum to signal the other parts to do their job.
Does the pulmonary vein bring oxygenated blood to the heart from the lungs?
yes
The blood from the pulmonary vein goes into the left or right atrium?
Left
From the pulmonary vein to atrium then ventricle (left), where does the blood then go?
Into an artery called the Aorta.
From the Aorta where does the blood go?
All around the body.
What artery is under the most pressure?
The aorta
which side has lower CO2 and oxygenated blood?
Left side. (Looking at it, on the right side).
Which side has the highest CO2 and deoxygenated blood?
The right side. (Looking at it, the left side).
When deoxygenated blood returns the heart after being around the body, where does it come through?
The vena cava
The timing of the cardiac cycle is controlled by what?
The SAN
what is the SAN?
part of the heart muscle that acts as a pacemaker
Does the SAN muscle send impulses over the atrial walls to cause both atriums to contract?
Yes
What does the SEPTUM stop?
impulses from the SAN muscle going straight to the ventricles.
