HUMAN HEART BEATING

Introduction of human heart beatingPhenomenon of human heart beating includes following events: systole, diastole, pulse rate and cardiac cycle ( human heart beating) .  Here are some common terms related to human heart beating:

  • Systole of normal human heart rate: It refers to the contraction of heart chambers (human heart beating)
  • Diastole of normal human heart rate : It refers to the relaxation of heart chambers (human heart beatings close)
  • Joint diastole normal human heart rate : It refers to the relaxed state of both atria and ventricles (human heart beating)
  • Human heart beating rate: It refers to the numbers of times the heart beats per minute. It is equivalent to the number of cardiac cycle per minute. )human heart beating)
  • Initial 0.15 second of normal human heart rate : Contraction of atria and relaxation of ventricles.(human heart beating)
  • Artial systole and ventricular diastole of normal human heart rate : Atrio ventricular valves open and semilunar valves are closed (human heart beating)
  • Next 0.25 seconds of normal human heart rate : Relaxation of atria and contraction of ventricles(human heart beatimg)
  • Artial diastole and ventricular systole of normal human heart rate: Atrio-ventricular valves close —- first human heart beating LUBB; first all valves closed initially during human heart beating then ventricles contract. Semilunar valves closed initially but open later during human heart beating
  • Next 0.4 seconds of human heart rate: Atria relax as well as ventricles also relax during human heart beating.
  • Joint diastole of human heart rate: Semilunar valves close —— second human heart beating DUB. Initially all the valves are closed later atrio-ventricular  valves are opened (human heart beating)

Human heart beating is occurred continuously without pause throughout the life. Atria and ventricles show rhythmic  (normal human heart beating )contraction and relaxation in a specific manner during one heart beat which is known as cardiac cycle (human heart beating).

On an average, normal  human heart rate is 72 times /minute.

During a human heart beating both atria contract simultaneously and blood flows into the ventricles and then both ventricles contract together forcing the blood into pulmonary artery and aorta.(human heart beating)

DETECTION OF NORMAL HUMAN HEART BEATING:  In the human heart, there is a specialized area of cardiac muscle fibres called sinoatrial node (human heart beating),  or SA node in the right atrium. SA node (human heart beating) is called the pacemaker as it generates each wave of cardiac impulse. Each human heart beating or cardiac impulse originates from here and then spreads as a wave of contraction in the heart  (normal human heart rate). The electric changes sweep across the heart chambers in a specific sequence of human heart beating.  These electric changes can be recorded by an instrument called electrocardiograph ( human heart beating). A graphical record of these changes during human heart beating is called an electrocardiogram or ECG.

DEFECT IN HUMAN HEART BEATING: A defect in the heart can be identified by observing the changes in the pattern of ECG . (human heart beating) An ECG is used by doctors to determine the location and extent of damage caused by the heart attack (problems in human heart beating) and later helps to assess the extent of recovery.

ARTIFICIAL PACE MAKER (human heart beating):  When sinoatrial node (SA node) – the pace maker of heart becomes damaged (problem in human heart beating)  or defective , the cardiac impulses do not generate at the regular intervals (human heart beating). There is irregularity in human heart beating.  By grafting  artificial pace maker this problem can be overcome. Artificial pace maker is an electronic device which is grafted surgically in the chest of the patient.  It stimulates the heart electrically for normal human heart beating at regular intervals to initiate the heart beat as sinoatrial node does in a normal human heart beating.

NORMAL PULSE RATE OF HUMAN : It is a wave of distension followed by the constriction, felt in the arteries as a result of ventricular systole and diastole (normal pulse rate of human).

Normal pulse rate of human per minute is equal to human heart beating rate /minute.


  • QS 1 (NORMAL PULSE RATE OF HUMAN): Name the blood vessel which supplies blood to the liver(normal pulse rate of human
  • Ans 1 (normal pulse rate of human): hepatic artery (normal pulse rate of human)
  • Qs 2( normal pulse rate of human) Name the valve present in between the chambers of the right side of the human heart (normal pulse rate of human)
  • Ans2 (normal pulse rate of human) tricuspid valve (normal pulse rate of human)
  • Qs3 (normal pulse rate of human) what is the function of RBC? (normal pulse rate of human)
  • Ans3 (normal pulse rate of human ) Main function of RBC is to transport oxygen and carbon-di- oxide. (normal pulse rate of human)
  • Qs4 (normal pulse rate of human) what is the function of platelet?( normal pulse rate of human)
  • Ans4 (normal pulse rate of human)Blood platelets involve in blood clotting while injury (normal pulse rate of human).
  • Qs5 (normal pulse rate of human) Discuss how the WBCs provide defence to the body? (normal pulse rate of human)
  • Ans5 (normal pulse rate of human) The main function of WBCs is to provide defence by: engulfing bacteria by phagocytosis( normal pulse rate of human); destroying damaged cells (normal pulse rate of human); forming antibodies (normal pulse rate of human). In this way WBCs provide a huge protection to the body (normal pulse rate of human)
  • Qs6 (normal pulse rate of human) name the soluble protein found in blood platelet (normal pulse rate of human)
  • Ans6 (normal pulse rate of human) Fibrinogen (normal pulse rate of human)
  • Qs7 (normal pulse rate of human) Name the phase of the cardiac cycle in which the ventricles relax (normal pulse rate of human
  • Ans7 (normal pulse rate of human) Ventricular diastole (normal pulse rate of human)
  • Qs8 (normal pulse rate of human) why does the blood flow in the arteries flowing in spurts (normal pulse rate of human)
  • Ans8 (normal pulse rate of human) In arteries blood pressure is high, blood flows rapidly because lumen in narrow and the arteries do not have valves , so blood flows in spurts. (normal pulse rate of human)
  • Qs9 (normal pulse rate of human) What is Diapedesis? (normal pulse rate of human)
  • Ans9 (normal pulse rate of human) The leucocytes squeeze out through the walls of blood capillaries into the tissues. This phenomenon is called diapedesis. (normal pulse rate of human)
  • Qs10 (normal pulse rate of human) Fill in the blanks: LUBB : Atrioventricular valves :: DUB :  ____ ? (normal pulse rate of human)
  • Ans10 (normal pulse rate of human) Semilunar valve (normal pulse rate of human)
  • Qs11 (normal pulse rate of human) Name two major circulations of blood in the human body (normal pulse rate of human)
  • Ans 11 (normal pulse rate of human) Pulmonary circulation and Systemic circulation (normal pulse rate of human)
  • Qs12 (normal pulse rate of human) From where to where do the following blood vesseks carry blood:- pulmonary artery, renal artery, hepatic vein, hepatic portal vein? (normal pulse rate of human)
  • Ans12 (normal pulse rate of human) pulmonary artery from right ventricle to lungs; renal artery from aorta to kidney; hepatic vein from liver to posterior vena cava and hepatic portal vein from stomach and intestine to liver (normal pulse rate of human)

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