A-Level Biology - Cardiac Cycle - Atrial Systole | Ventricular Systole | Diastole (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. The Cardiac Cycle Definition * The sequence of contraction and relaxation of the heart muscle. * The three main stages: atrial systole, ventricular systole, and diastole. 2. The Stages of the Cardiac Cycle Explained * Atrial Systole: Contraction of the atria and opening of atrioventricular valves. * Ventricular Systole: Contraction of the ventricles, closing of atrioventricular valves, and opening of semi-lunar valves. * Diastole: Relaxation of the atria and ventricles, closing of semi-lunar valves, and passive filling of the atria. 3. How to Calculate Cardiac Output * Definition of cardiac output, heart rate, and stroke volume. * The formula for calculating cardiac output. * A worked example demonstrating the calculation. *** EXAM BOARD SPECIFIC INFO *** AQA - Everything is relevant to your course! OCR - You don't need to know how to calculate cardiac output CIE - You don't need to know how to calculate cardiac output *** CHAPTERS *** 0:00 Introduction to the Cardiac Cycle 0:23 What the Cardiac Cycle Is 0:47 Stage 1: Atrial Systole 1:18 Stage 2: Ventricular Systole 1:58 Stage 3: Diastole 2:32 How to Calculate Cardiac Output 3:18 Cardiac Output Calculation Example *** PLAYLISTS *** https://youtube.com/playlist?list=PLidqqIGKox7VzYfPIVt8T09xOLNcolCe4&si=8JmDajxjtba6rdc3 https://youtube.com/playlist?list=PLidqqIGKox7UZ3mWhbHv2aA_1vnbsfRPq&si=q3hEKdA4v7kbfwMe https://www.youtube.com/playlist?list=PLidqqIGKox7UTimdJ3eFcnt6xL9GUt2a6 https://youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh&si=orIUwL3o2jOoiYjT https://youtube.com/playlist?list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g&si=DcihOwUkd9oWbbdp https://youtube.com/playlist?list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W&si=Y8MsO-FK948jnxpS https://youtube.com/playlist?list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7&si=-7i5Iq7yOeJrhtu6 https://youtube.com/playlist?list=PLidqqIGKox7VKJD2WxRhoKaI6JGLVean8&si=NH_Q1ujhVgACM2FU #Alevel #Biology #study #revision #school #exam #AQA #OCR #Edexcel