Before atrium contracted, the pressure was zero in relaxed ventricle. Blood moves into ventricle and pressure is transferred to left ventricle. The pressure in the aorta is more than the pressure in the ventricle. Mitral valve must be open (Aortic valve will be closed) which means that during atrial contraction there is a communication between the left atrium & left ventricle BUT there is NO communication between the left ventricle & aorta. Increased pressure within the left atrium produces due to atrial contraction. Arterial contraction phase When left atrium contracts pressure in atrium increases.
Atrial 20% filling becomes significant during exercise. In other words, before atrial contraction, about 80% of ventricular filling is already done, which means that when atrial contraction occurs it just adds 20% of ventricular filling. Let’s discuss each phase: 80% of ventricular filling is passive (does not require atrial effort) that means if someone has a mechanical problem in his atrium, he will still have the 80% so will not suffer significantly. Najeeb Notes When we talk about cardiac cycle, we are discussing the events that occur in : 1) Atrium 2) Ventricle 3) Aorta Notice here: the events occur in the left side of the heart = the events occur in the right side the only difference is that the pressure in the right side is less than the left side. Download Cardiac cycle notes from najeeb lectures and more Medical Sciences Lecture notes in PDF only on Docsity! These notes are based on Dr.najeeb’s videos only " ال ُيستغنى بها عن المحاضرة األصلية " *Done by : Khawla Alammari & Nojood Alhaidri Dr.
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