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karthikmns
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eval_testing_mns

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2. Ask him/her to hold the fist with a piece of cloth rolled
in the hand. Now the blood vessels can be seen more
prominently.
3. Find undivided blood vessel, where we have to work for
the next few minutes.
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4. At the end of the vessel farthest from the elbow apply
steady pressure, so as to close its cavity.
5. Now apply pressure from elbow towards the palm slowly
and observe the changes in the blood vessels. (Take the
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fig-8(b): Harvey’s help of the figures given here.) Observe changes and
demonstration discuss in your class.
Answer the following:
In which blood vessels valves are found? What do you think is the
function of the valves in them?
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Why do sub-cutaneous blood vessels bulge on the side away from
the heart when the hand is tied?
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The deep seated blood vessels (the arteries) bulge on the side
towards the heart when tied. What do you understand from it?
There are valves in the heart between atria and ventricles. Is the
purpose of valves in the veins and heart same?
Why the arteries are deeply seated in the body? Where as veins are
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seated on peripheral part of the body?
Arteries and veins
There are two types of blood vessels called arteries and veins. Arteries
carry blood from the heart to body parts. Whereas, veins carry blood from
body organs to heart. Let us observe the structural and functional
differences between arteries and veins.
56 X Class Transportation - The circulatory system
tough fibrous coat
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muscle layer lumen
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elastic lumen
fibrous coat lining cells
lining cells
(endothelium)
(endothelium)
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AN
fig-9(a): T.S. of Artery fig-9(b): T.S. of Vein fig-9(c): T.S.of Blood capillary
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Blood capillaries
Blood capillaries are the microscopic vessels made of single layer of
cells. They allow diffusion of various substances. The leucocytes (WBC)
can squeeze out of the capillary wall. They establish continuity between
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arteries and veins.
After reading the experiments by Harvey fill in the following table.
Use the clues/options given in the first column.
Table-3
Structure / Function of blood vessel Artery Vein
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1. Thickness of walls(thick / thin)
2. Valves (present / absent)
3. Capacity to retain shape when blood is absent
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(can retain/can’t retain)
4. Direction of blood flow (heart to organs / body
organs to heart)
5. Pressure in the vessel(low /high)
6. Type of blood transported
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(oxygenated / de-oxygenated)
Discuss the differences between pulmonary artery and pulmonary
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