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Question -

Write the differences between:

(a) Blood and Lymph
(b) Open and Closed system of circulation
(c) Systole and Diastole
(d) P-wave and T-wave



Answer -

The differences are asfollows:

(a) Blood and Lymph

Lymph

Blood

It is a white tissue fluid

It is a red liquid connective tissue

Lymph flows in the lymph vessels

Blood flows in the blood vessels such as capillaries, arteries and veins

It contains white blood cells known as lymphocytes

Blood contains red blood cells, haemoglobin, platelets and white blood cells

The exchange of nutrients and gases between the blood and cells takes place through the lymph

Blood transports gases and other nutrients to the body.


(b) Open and Closedsystem of circulation

Open system of circulation

Closed system of circulation

Blood that is pumped by the heart passes through the large vessels into the open spaces or body cavities(sinuses)

Blood pumped by the heart flows via the closed network of the blood vessels

Blood flow is not regulated in this type of circulation

Blood flow is regulated by the valves in closed system of circulation

This circulation is slower and less efficient

This circulation is more rapid and efficient comparitively

Example – it is found in molluscs, arthropods

Example – it is found in chordates and annelids


(c) Systole and Diastole

Systole

Diastole

Systole is the contraction of the chambers of the heart

Diastole is the relaxation of the chambers of the heart

It causes an increase in the blood pressure within the heart

It causes the blood pressure to decline in the heart

Blood is pumped out of the chambers

Blood is received by the chambers


(d) P-wave and T-wave

P-wave

T-wave

P-wave depicts the depolarization or electrical excitation of the atria

T-wave depicts the repolarization of the ventricles

Blood is pumped into the ventricles

Blood is received by the atria

 

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