Wednesday, 10 August 2011

Pulse

Do you know what is meant by Pulse?
Pulse is the rate at which our heart beats.

Have you ever wonder what cause it to keep on beating?
Well human heart keep on beating even when we are in rest. Generally heart is composed dense tissue of fiber and muscle. This fibrous tissue will undergo configuration and form specialized structure and play role in electricity transmission. 
4 main specialized structure: 
  • SA node
  • AV node
  • Bundle of His
  • Purkinje Fiber
 
Tittle: Electrical Conductivity of Heart
    Resources:http://www.univer-gain.com/blog/electrical-conductivity-heart/

    Sinoatrial node are specialized fibrous tissue placed at the right atrium near the opening of the superior vena cava. SA node also known as pacemaker as it functions to generate electrical impulse and initiates heart beat.  
    Atrioventricular node is situated in between atria and ventricle. It functions to receive impulse from SA node and results in atrial contraction.
    Then the electrical impulse will relay on Bundle of His which further divides into left and right surrounding the left ventricle and right ventricle.  
    Then the Bundle of His will further divide forming Purkinje Fiber. The impulse that reaches the Purkinje Fiber will cause the ventricles to contract.

    Heart Conduction System

    video
    Resource:http://www.youtube.com/watch?v=QLDLul1qcWk
     
     
    Resource: Donna Van Wynsberghe,1990,Human Anatomy and Physiology.

    Friday, 5 August 2011

    Pumps Your Blood

    Blood Flow Through The Heart 
    Rocking Happy Days Potsie's
    'Pump Your Blood Songs'

    video

    Resource:http://www.youtube.com/watch?v=upctPUa6RhA

    Wednesday, 3 August 2011

    Travel of Blood

    Human blood is an adventurous fluid. It travels right from top to bottom of your body. In general human blood circulate in two different pathway namely Pulmonary Circulation and Systemic Circulation. 
    What course the blood to make such a journey? Have you guys ever think about it ! 
    Well it is not black magic, but the blood are transported due to the pumping action of the heart and the general characteristic of vessels. Each time the heart pumps, there will be a movement of blood into the heart chambers and also away from the heart. 

    Blood Circulation

    Let us peek into the Pulmonary and Systemic Circulation.

    Pulmonary Circulation
    Deoxygenated blood travels from right ventricle to the lung and exchange of gases occur. Then the oxygenated blood will be transported into the left atrium via the pulmonary vein. 
    Easy Buddy: Heart > Lungs > Heart

    Systemic Circulation.
    The oxygenated blood will be pumped into the Aorta and transported to all the body cell except lungs.
    The deoxygenated blood will travel back into the heart via Superior and Inferior Vena Cava.\
    Easy Buddy:  Heart > Body Cells > Heart

    Overall Circulation
    Heart > Body Cells > Heart > Lungs > Heart
    Lung is the friend of heart, Body Cells are its foe
    Resource: Donna Van Wynsberghe,1990,Human Anatomy and Physiology.