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10 students of your class in the following tabular form. |
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Table-2 |
S.No Name of the student Heart beat at rest/min Pulse rate at rest/min |
1 Eshwar 72 72 |
T |
ER |
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Let us plot histogram on heart beat and pulse rate of |
different persons as shown in the sample graph. Here |
blue bar indicates heart beat, red bar indicates pulse rate. |
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What is the relationship between the heart beat |
and the pulse? |
Eshwar Can we say, the pulse rate is always equal to the |
heart beat? |
x-axis: Name of the student You might have studied there is a relation between |
y-axis: Heart beat, pulse rate per minute |
pulse rate and heart beat. |
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50 X Class Transportation - The circulatory system |
Now try to understand the structure and method of working of this |
vital organ, the heart. It is the beat of the heart which keeps us alive. Heart |
is located in between the lungs and protected by rib cage. The size of your |
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A |
heart is approximately the size of your fist. |
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AN |
NG |
fig-3: Location of Heart fig-4: Heart |
External features |
Lab Activity |
LA |
Aim: Observation of the internal structure of the mammalian heart. |
Material required: Freshly collected specimen of heart of sheep or |
TE |
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goat from the butcher. Soda straws, used pen refils, sharp and long blade |
or scalpel, tray, a jug of water, Dissection scissors, forceps. |
Since the structure of all the mammalian hearts are similar, we take |
the sheep’s or goat’s heart for our observation. For this, we need following |
materials. |
Procedure for observation: |
T |
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Before coming to the class wash the heart thoroughly so that, blood is |
completely drained from the chambers of heart. |
ER |
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Take soda straws and insert them into the stumps of the blood vessels. |
Note your observations as you proceed. |
How many layers are covering the heart? |
(Now remove the layers covering the heart, and observe) |
SC |
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What is the shape of the heart? |
How many large blood vessel stumps are attached to the heart? |
Which end of the heart is broader and which end is narrow? |
Observe the arrangement of blood vessels (coronary vessels) on the |
wall of the heart. |
(In case you don’t have a model or a goat’s heart, look at the figures |
given carefully for observation) |
Free distribution by T.S. Government 2019-20 51 |
Internal structure of the heart |
Keep the heart in the tray in such a way that a large arch like tube faces |
upwards. This is the ventral side. |
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A |
Now take a sharp blade or scalpel and open the heart in such a way that |
the chambers are exposed. Take the help of the fig-5. |
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AN |
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