In this article we will discuss about the structure of junctional tissues of human heart with the help of suitable diagram. Cardiac muscle consists essentially of certain specialised structures which are responsible for initiation and transmission of cardiac impulses at a higher rate than the rest of the muscle. Those specialised cardiac tissues operate such mechanism are collectively known as [...]
In this article we will discuss about the transmission of cardiac impulse of humans with the help of suitable diagram. 1. Conduction over Atrial Muscle: Cardiac impulse originated at the S.A node is transmitted over both the atria like concentric waves and thus the P wave is produced in E.C.G. (Electrocardiogram). The spread of electrical impulse through the S.A. node [...]
The following points highlight the three main electrocardiographic leads of human body. The leads are:- 1. Standard Limb Leads 2. Augmented Unipolar Limb Leads 3. Chest Leads. 1. Standard Limb Leads: The action current of the heart is recorded by placing two electrodes in two different positions in the body. (Fig. 7.62) Such arrangement of lead is called bipolar leads. [...]