Surabhi Panwar Circulatory System_2
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Transcript of Surabhi Panwar Circulatory System_2
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SURABHI PANWARRoll no. -055Program/Course-B.EdCLASS 7
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COMPONENTS OF CIRCULATORY SYSTEM
1.BLOOD
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CIRCULATORY SYSTEM VIDEO
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RED BLOOD CELLS (RBC)
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RED BLOOD CELLS:
They are also known aserythrocytes.
Do not have a nucleus
Biconcave discs
Contain the chemicalhaemoglobin.
Haemoglobin carries
oxygen around the body. At the centre of the
haemoglobin molecule isan iron atom.
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WHITE BLOOD CELLS (WBC)
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White Blood Cells:
Also called leucocytes.They are bigger than redblood cells and have largenuclei.
Act as the bodys defencesystem.
Some white blood cells surround and consumeharmful microbes.
Some produce chemicals called antibodies thatfight infection.
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PLATELETS
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Platelets:
Formed in red bone marrow.
Platelets help to repair tissuesand close wounds both
internally and externally.
When needed, they grow intoirregular shapes and sticktogether to form a plug over the
wound.
Plateletsare also carried in the blood.
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PLASMA
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Plasma
A straw-coloured
liquid thatcarries thecells and theplateletswhich helpblood clot.
carbon dioxide
glucose
amino acids
proteins
minerals
vitamins
hormones
waste materialslike urea.
It also contains usefulthings like:
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2. BLOOD VESSELS
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Blood Vessels :The circulatory system consists of many tubes thattransportand control the flow of blood around the body,these are blood vessels.
There are 3 types of blood vessels:
a. ARTERY
b. VEIN
c. CAPILLARY
http://www.biology-online.org/dictionary/Circulatory_systemhttp://www.biology-online.org/dictionary/Controlhttp://www.biology-online.org/dictionary/Circulatory_systemhttp://www.biology-online.org/dictionary/Flowhttp://www.biology-online.org/dictionary/Bloodhttp://www.biology-online.org/dictionary/Tubeshttp://www.biology-online.org/dictionary/Bodyhttp://www.biology-online.org/dictionary/Blood_vesselshttp://www.biology-online.org/dictionary/Blood_vesselshttp://www.biology-online.org/dictionary/Blood_vesselshttp://www.biology-online.org/dictionary/Flowhttp://www.biology-online.org/dictionary/Bloodhttp://www.biology-online.org/dictionary/Bodyhttp://www.biology-online.org/dictionary/Blood_vesselshttp://www.biology-online.org/dictionary/Blood_vesselshttp://www.biology-online.org/dictionary/Bodyhttp://www.biology-online.org/dictionary/Bloodhttp://www.biology-online.org/dictionary/Flowhttp://www.biology-online.org/dictionary/Controlhttp://www.biology-online.org/dictionary/Tubeshttp://www.biology-online.org/dictionary/Circulatory_system -
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THE ARTERY
thick muscle and
elastic fibres
Arteries carry blood away from the heart.
the elastic fibres allow
the artery to stretch
under pressure
the thick muscle cancontract to pushthe
blood along.
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THE VEINVeins carry blood towards from the heart.
thin muscle and
elastic fibres
veins have valveswhich act to stop theblood from going inthe wrong direction.
body muscles surround the veinsso that when they contract tomove the body, they also squeezethe veins and push the blood alongthe vessel.
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Blood vessels: Valves
When blood is flowing against gravity, or when a vein is squeezed
by muscle action, there is a risk that blood will flow in the wrongdirection. Veins have valves to prevent backflow.
bloodto theheart
backflowprevented
veinvalveopen
vein valveclosed
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3.HEART
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Cardiac systemThe four chambers of the heart have special names:
A lower chamber is called a ventricle.
An upper chamber is called an atrium (plural: atria).
rightatrium
rightventricle
left
atrium
left
ventricle
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Cardiac systemHere are some other important parts of the heart:
The wallsare made of
cardiacmuscle.
The walldividingthe left
and rightsides ofthe heartis called
the
septum.
The semi-lunarvalves preventexpelled bloodflowing back
into the heart.
These valvesprevent blood
flowing back into
the atria from theventricles.
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Circulatory system is the system which transports theblood through out the body .
It consists of blood, blood vessels and heart.
Blood consists of RBCs , WBCs, Platelets & Plasma.
Blood vessels help in transportation of blood throughoutthe body and are the following Artery, vein & capillary.
Valves prevent the backward flow of blood.
Heart has four chambers Left Atrium, Right Atrium, Left
Ventricle & Right Ventricle.
SUMMARY
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REFERENCES:
Google Images Wikipediawww.Biologyonline.comwww.britannica.com
http://www.biologyonline.com/http://www.britannica.com/http://www.britannica.com/http://www.biologyonline.com/