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Question 1

Double circulation

Answer 1

Pulmonary circulation and systematic circulation

Pulmonary circulation :
The deoxygenated blood pumped into Pulmonary artery is passed on to lungs that oxygenated blood is carried by pulmonary veins into left atrium.

Systemic circulation:
The oxygenated blood entering the aorta
Is carried by a network of arteries, arterioles and capillaries to the tissues from where the deoxygenated blood is collected by a system of venule, veins and Vena Kava and emotied into right atrium

Question 2

Systemic circulation provides

Answer 2

Provides nutrients, Oxygen and other essential substances to the tissues and takes carbon dioxide and other harmful substances away for elimination

Question 3

Electrocardiograph

Answer 3

Graphical representation of electrical cavity during cardiac cycle

Question 4

The P wave represents

Answer 4

Electrical excitation of Atria which leads to contraction of both atria

Question 5

QRS Complex represents

Answer 5

The depolarization of ventricles which initiates The ventricular contraction

Contractions start shortly after Q and marks the beginning of systole

Question 6

T wave represents

Answer 6

Return of ventricles from excited to normal state
End of the way marks the end of systole

Question 7

By counting number of QRS

Answer 7

One can determine Heartbeat rate of an individual

Question 8

Tricuspid and bicuspid valve

Answer 8

Opening between right Atrium and right ventricle
Is guarded by valve formed of 3 muscular flaps or cusps called the tricuspid valve

Bicuspid or mitral valve Guards the opening between left atrium and left ventricle

Question 9

Semi lunar valve

Answer 9

The openings of the right and left ventricles into Pulmonary artery and aorta

Question 10

Functions of semilunar Valve

Answer 10

It allow flow of blood only in one direction
That is from the Atria to the ventricles and from the ventricles to the pulmonary artery or aorta
These valve prevent back flow of blood

Question 11

S a n

Answer 11

Specialised cardiac musculature called the nodal tissue is also distributed to the right upper corner of the right Atrium called SAN

Question 12

A v n

Answer 12

Another mass of tissue is seen in the Lower left corner right Atrium close to atrio ventricular septum called atrio ventricular node

Question 13

What is purkinje fibres

Answer 13

A bundle of nodal fibres,atRio ventricular bundle (av bundle ) continuous from a v n passes through at Rio ventricular septa emerge on the top of Inter ventricular septum and divide into a right and left bundle these branches give rise to minute fibres throughout the ventricular musculature these are called purkinje fibres

Question 14

Fibres along with the right and left bundles are

Answer 14

Bundle of his

These nodal musculature has the ability to generate action potential without an external stimuli

Question 15

Pace maker of heart

Answer 15

S a n can generate maximum number of action potential
That is 70 to 75 minutes and is responsible for initiating maintaining contractile activity of heart and it is called pacemaker

Question 16

Cardiac output

Answer 16

Volume of blood pumped out by each ventricle per minute and average 5000 ml for 5 L in a healthy individual