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eval_testing_mns

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seconds.
5. Relaxation of
Hence, naturally the blood is pumped into the blood vessels at ventricles. The
regular intervals. The tissues will not receive the blood continuously, closing of arterial
but in the form of spurts. When we keep our finger at the wrist, where valves (Dub).
the artery is passing into the hand we feel the pressure of blood moving
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fig-10(1-5):
in it. This is the pulse. The rate of the pulse will be equal to the Cardiac cycle
number of heart beats.
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Do you know?
Name of the No. of
Weight of the body Weight of the heart
animal
LA beats/min
Blue whale 1,50,000 kg 750 kg 7
Elephant 3000 kg 12 - 21 kg 46
Man 60-70kg 300 gm 76
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Coaltit (Bird) 8 gm 0.15 gm 1200
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Single /double circulation
We know that blood flows in
the blood vessels. To keep the
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blood moving the heart pumps it
continuously. The blood that is
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pumped by the heart reaches the
body parts and comes back to the
heart. But course taken by the
blood is not the same in all the
animals. Let us observe the fig-
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11(a) and (b). Start from any point
in the fig-11(a) and (b). Move in
the direction of arrow. Note down
the parts which are in the way in
cyclical form.
(Try to identify different parts fig-11(a): Single fig-11(b): Double
of the body in both figures.) circulation circulation
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Free distribution by T.S. Government 2019-20 59
Compare the two flow charts and answer the following.
How many times did your pointer touch body parts in fig-11(a) and (b)?
How many times did your pointer touch the heart in fig-11(a) and (b)?
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A
How many times did your pointer touch the respiratory organs in
fig-11(a) and (b)?
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From your observation it is clear that in fig -11(a) blood flows through
heart only once to complete one circulation.
If blood flows through heart only once for completing one circulation
it is called single circulation.
If the blood flows through the heart twice for completing one
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circulation it is called double circulation.
Lymphatic system
Have you ever observed what happened to your feet after overnight
journey, in sitting position without moving? We feel that our foot wear is
little tight. In elders it will be clear that the lower part of the legs will be
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swollen. This stage is called edema.
Why do our legs swell?
As blood flows through tissues and through blood capillaries
some amount of fluids and certain solid materials are constantly
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