Illustrate the structure of heart with neat sketch. Suggest the suitable device to measure electrical activity of heart and elaborate with neat sketch?

structure of heart

The heart is roughly cone shaped hollow organ. It is approximately the size of owner’s closed fist and weighs about 250-300 gm in female and 300-350gm in the male. The heart lies in the thoracic cavity in the space between the lungs (mediastinum) anterior to the vertebral column and posterior to the sternum. The heart consists of 4 chambers. At first, the heart is divided into the right and left side by the septum. Each side is further divided into 2 chambers each by the atrioventricular valve. The upper two chambers are called atrium and lower two are called ventricles. Atrium are thin-walled chamber separated by an interauricular septum

The right atrium receives impure blood from the body through the opening via superior and inferior vena cava. Ventricles are a thick-walled chamber. separated by the thick inter-ventricular septum.

ElectroCardioGraphy

Shape of ecg

Contraction of atria - P wave

Ventricular depolarization - QRS complex

Ventricular repolarization - T wave

 It is a transthoracic interpretation of the electrical activityof the heart over time captured and externally recordedby skin electrodes.

The device used to produce this non invasive record iscalled the electrocardiograph.

ECG is the gold standard for the noninvasive diagnosis ofcardiac diseases and may occasionally be the only marker for the presence of heart disease.