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karthikmns
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eval_testing_mns

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Activity-1
You could try to find out for yourself, what the doctor was doing. Keep
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your index and middle fingers on your wrist below the thumb as shown in
the fig-1.
What did you feel?
You feel something pushing your fingers rhythmically
up and down. Now let us count the rhythm which is called
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the pulse, for a minute. Now stand up and jog for one minute
at the same place. Note the pulse for a minute. Take
readings atleast two of your friends in the same manner
and record in the following table. fig-1: Pulse
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Table-1
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S.No Name of the person Pulse rate per minute
at rest after jogging
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What did you observe? Is the pulse rate same in both conditions?
Activity-2
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We see that pulse rate varies from person to
person and situation to situation. So it is not constant,
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when you are afraid or excited the pulse rate goes up.
Observe your pulse rhythm in other ways as well such
as climbing stairs, running, etc. There is a relationship
between the pulse rate and the beat of our heart. Now
let us try to find out more about this relationship.
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fig-2: Matchstick stethoscope
For this you have to make your own stethoscope.
Take a shirt button insert a matchstick as shown in
fig-2. Place it on your wrist. Observe movements in matchstick.
What did you find?
When do you think that our pulse rate goes up?
What does the pulse rate show?
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Free distribution by T.S. Government 2019-20 49
Do you know?
Children over 10 Well-
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Newborn Infants Infants Children years & adults,
including trainedadults
(0–3 months) (3-6 months) (6–12 months) (1-10 years)
senior citizens athletes
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100-150 90-120 80-120 70-130 60-100 40-60
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In the year 1816, Rene Laennec discovered the Stethoscope. Before
the discovery of stethoscope doctors used to hear heart beat by keeping
ear on the chest of the patient. Laennec found that paper tube helps to hear
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the heart beat perfectly. Then he used a bamboo instead of paper tube to
hear heart beat. Laennec called it stethoscope.
Activity-3
Let us repeat the work done by Laennec.
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Make a paper tube 10 inch long and one inch in diameter. Keep one
end of it on the chest of your friend on a point one inch to the left side to
the centre around 6 inches below from his or her neck. Keep your ear at
the other end. Listen carefully and count the heart beats for a minute.
Also count down your friend’s pulse rate. Note observations of at least
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