Question

(i) Label parts 1,2 and 3.
(ii) Name the phase shown in this figure and also
mention the time taken by it.
(iii) What do you understand by heart sound?
(iv) Draw a neat labeled T.S. diagram of Part 2 and 3
and also mention any two differences between them.
(v) Name the four types of Nodal tissue found in the
human heart​

Answer 1

Answer:

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Explanation :

( i ) part 1 is Left pulmonary artery

part 2 is Superior vena cava

part 3 is Aorta

( ii ) the phase shown in this figure are :-

1. Interphase

2. Mitotic phase

( iii ) There are two types of heart sound :- LUBB and DUBB . At the beginning of ventricular systole the cuspid valves closed with a sound . This is the first heart sound call LUBB . After the ventricular systole, the ventricular diastole occurs . At the beginning of this phase, the semilunar valves close sharply and the second heart sound is called DUBB .

( iv )

( v) The four types of Nodal tissue found in thehuman heart are :-

1. Sino - atrial node

2. Atrioventricular node

3. Atrioventricular Bundle

4. Purkinje fibres