Chambers Of The Heart Flashcards
What separates the two atria?
The interatrial (IA) septum
What does the right and left atria fill up with?
Right- deoxygenated blood from the systemic circulation.
Left- oxygenated blood from the pulmonary circulation.
What is more muscular, the atria or the ventricles?
The ventricles, the left is especially muscular as it has to push blood around the full body.
What are the two ventricles separated by?
The interventricular (IV) septum.
Where does the pulmonary circulation drain into the left atrium from?
Pulmonary veins.
Where does the systemic circulation drain into the right atrium from?
The superior and inferior vena cava.
When does the atria contract?
The end of diastole. However during exercise atrial contraction becomes essential to match the speed of ventricular filling to the increased rate of ventricular contraction.
Why are muscle fibres in the ventricles arranged in the way that they are?
So that ventricular contraction progresses upwards in a spiral from the apex of the heart, towards the vessels leading out of the ventricles.
