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arteries to head |
artery to left arm |
null |
superior vena cava |
aorta |
pulmonary artery (left branch) |
null |
null |
null |
null |
NG |
pulmonary artery (right branch) |
left pulmonary veins |
right pulmonary veins |
left atrium |
right atrium semi - lunar valve in the |
pulmonary artery |
null |
right atrio ventricular valve |
LA left atrio ventricular value |
(Tricuspid Valve) (Bicuspid Valve) |
left ventricle |
inferior vena cava |
right ventricle |
TE |
null |
fig-5: Internal structure of heart |
Now observe the internal structure. Observe the wall of the heart. |
Is the thickness of the wall of the heart uniform throughout? |
How many chambers are there in the heart? |
Are all the chambers of the same size? |
T |
null |
null |
What other differences could you observe between the chambers? |
Do you find any specific observation in between two chambers? |
ER |
null |
null |
null |
null |
Are all the chambers connected to each other? |
How are they connected to each other? How are they separated? |
You can observe white coloured structures in the lower part of the |
heart. Note down the size, shape and to which parts they are attached. Can |
you guess the function of these structures? |
SC |
null |
null |
null |
null |
Write a note on your observations of the heart. Compare your notes |
with the description given below. |
The heart is a pear shaped structure, triangle in outline, wider at the |
anterior end and narrower at the posterior end. |
The heart is covered by two layered membrane. This is called |
Pericardium (pericardial membrane). The space between these two layers |
is filled with pericardial fluid, which protects the heart from shocks. |
52 X Class Transportation - The circulatory system |
The heart is divided into four parts externally by grooves. |
Two upper parts are called atria (auricles), and the lower ones are called |
ventricles. |
null |
null |
null |
null |
A |
The blood vessels found in the walls of the heart are coronary vessels |
which supply blood to the muscles of the heart. |
null |
null |
null |
null |
AN |
The walls of the ventricles are relatively thicker than atrial walls. |
In our observation we found that the heart has four chambers in it. On |
the left side two chambers are present, one is anterior and the other is the |
posterior. On the right side also two chambers present, one upper (anterior), |
and one lower (posterior). |
null |
null |
null |
null |
NG |
The left atrium and ventricle are smaller when compared to that of |
right atrium and ventricle. |
Observe the presence of blood vessels attached to the heart. |
How many blood vessels are attached to the heart? |
Are all the blood vessels are rigid? How many of them are rigid? |
LA |
Do you think that the stiffness/rigidity of blood vessel is something |
to do with circulation? |
Arteries are the blood vessels which originate from the heart and supply |
blood to various organs in the body. They have thick walls. The largest |
TE |
null |
artery is aorta. The relatively smaller one is pulmonary artery which carries |
blood from the heart to the lungs. |
The veins are the blood vessels which bring blood from all body parts |
to the heart. Veins have relatively thinner walls. The vein which is at the |
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