explain the structure of human heartand cardiac cycle?
Answers
*human heart is four chambered with 2auricles and 2 ventricles.
*left and right structures are separated by atrioventricular Valve.
*right auricle/atria and right ventricle are separated by tricuspid valve.
*left auricle and ventricle are separated by bicuspid valve.
*deoxygenated blood from body parts enters the right atrium through superior and inferior vena cava.
*this is passed on tu the right ventricle by atrial sysytole means contraction of atria.
*the right ventricle receive the blood from atria in ventricular diastole means relaxation of ventricle.
*this is passed to pulmonary artery which is guarded by semilunar valve.
*pulmonary artery carries deoxygenated blood to the lungs were the blood is purified as oxygenated blood.
*this blood from lungs is reaching left atrium through pulmonary veins carrying oxygenated blood.
* this blood from left atria is passed on tu left ventricle and then send tu body parts through AORTA which is also guarded by semilunar valve.
*the systole and diastole of the heart is controlled by sa node(upper right corner of right atria), av node(lower left corner of right atria), bundle of his (atrioventricular septum), and Purkinje fibres (throughout the ventricles supported by papillary muscles).