Cardiac cycle | NMDCAT 2021 скачать в хорошем качестве

Cardiac cycle | NMDCAT 2021

Hi Everyone! Welcome To My Channel "Ali Academy Biology Lectures" About This Video ........................ In This Video Lecture You Will Learn Basic Concept Of Cardiac Cycle The Cardiac Cycle It is the sequence of events which take place during the completion of one heart beat. Heart beat involves three distinct stages 1. Relaxation phase - diastole. atria are illed with blood, they become distended and have more pressure than the ventricles. This The deoxygenated blood enters right atrium through vena cava, and oxygenated blood enters left ventricles which are relaxed. this is called atrial systole. The blood passes through tricuspid and bicuspid valves, into the two The muscles of atria simultaneously contract, when the atria are illed and distended with blood, is pumped to pulmonary arteries and aorta. The tricuspid and bicuspid valves close, and ‘lubb’ dubb can be heard with the help of a stethoscope). relaxed period of heart chambers is called diastole. 3. Ventricles contract - ventricular systole at the base of pulmonary artery and aorta close simultaneously, and ‘dubb’ sound is made. (Lubb, 2. Atria Contract - atrial systole atrium through pulmonary veins. The walls of the atria and that of ventricles are relaxed. As the When the ventricles receive blood from atria, both ventricles contract simultaneously and the blood sound is made. Ventricular systole ends, and ventricles relax at the same time semilunar valves One complete heart beat consists of one systole and one diastole, and lasts for about 0.8 seconds. In one’s life, heart contracts about 2.5 billion times, without stopping. Mechanism of heart Excitation and Contraction propagates the regulatory impulses septum, to themyocardium of of approximately 0.15 second in Impulses from the node travel to the the ventricles. There is a delay conductance from the S-A node to A-V the autonomic nervous system. of right atrium sends out electrical impulses to the atrial muscles, and causing both atria to contract. musculature of the atrium and to atrioventricular bundle of muscle ibres The sino-atrial node consists of a small number of difusely oriented cardiac ibres, possessing few The heart beat cycle described above starts when the sino-atrial node (Pace maker) at the upper end node, permitting atrial systole to be myoibrils; and few nerve endings from an atrioventricular node. From it an via excitable ibres in interventricular completed before ventricular systole About This Channel..................... I make these videos cause I love to draw and connect the complexity of science and medicine into art. I'm not saying. I'm 100% correct in all my videos, but I do try to obtain the information from credible sources. One-stop destination for all biology lectures. _ students in class 11, 12 or appearing for competitive medical exams ( NMDCAT ) will find it very beneficial _ The videos are categories under various heading to make the students life simplified Visit My Other Channel Playlist ..................... NMDCAT PART 1:    • New 1st Year Biology   NMDCAT PART 2:    • New 2nd Year Biology   Class 11th Lectures:    • New 1st Year Biology   Class 12th Lectures:    • New 2nd Year Biology   Class 10th Lectures:    • Matric Biology   Subscribe My Channel:    / aliacademya7r   Social Link........................ Instagram: https://instagram.com/ranaalibiologis... TWINS