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1. Where do these items go when we eat them?
2. How do they move around our body?
3. Why are they needed?
Questions:
1.What process takes place in every cell of the body and requires oxygen?
2.What is the full word equation for this process?
3.How do the materials needed and produced by this process get around the body?
Keywords: Circulatory system, :Keywords: Circulatory system, :
Question:
What process takes place in every cell of the body and requires oxygen?
Keywords: Circulatory system, :Keywords: Circulatory system, :
Respiration
Question:
What is the full word equation for this process?
Keywords: Circulatory system, :Keywords: Circulatory system, :
Respiration:
Oxygen + Glucose Carbon dioxide + Water (+ Energy)
Question:
How do the materials needed and produced by this process get around the body?
Keywords: Circulatory system, :Keywords: Circulatory system, :
Materials are passed around the body in the blood.
How does the blood get around the body?
• Is an organ – tissue working together.
• Is a double pump
• It pumps blood around the body.
• The lining is made of tissue to allow smooth blood flow.
• The wall is made of muscle tissue – to squeeze the blood out of the heart.
• Inside there are valves so blood flows in one direction.
Keywords: Circulatory system, :Keywords: Circulatory system, :
From the Body to the lungs
From the lungs to the body
A Pump• Task: Make a fist!
• Children hearts are approx the size of their fist• Adult hearts are approx the size of 2 fists• Open and close your fist – This is like the heart pumping (70
times a minute).
Keywords: Circulatory system, :Keywords: Circulatory system, :
Force• Squeeze a tennis ball – this is
about the force the heart needs to pump blood around the body.
Keywords: Circulatory system, :Keywords: Circulatory system, :
Blood Vessels• There are three main blood vessels in the
body:
• Arteries: Carry blood AWAY from the heart (Arteries Away).
• Veins: Carry blood TO the heart. (Vein – Vay In)
• Capillaries: Minute vessels that link the arteries and veins.
Keywords: Circulatory system, Aorta, Artery, Capillaries, :Keywords: Circulatory system, Aorta, Artery, Capillaries, :
Other facts• The aorta, the largest artery in the body, is
almost the diameter of a garden hose. • Capillaries, on the other hand, are so small
that it takes ten of them to equal the thickness of a human hair.
Keywords: Circulatory system, Aorta, Artery, Capillaries, :Keywords: Circulatory system, Aorta, Artery, Capillaries, :
Blood VesselsKeywords: Circulatory system, Aorta, Artery, Capillaries, :Keywords: Circulatory system, Aorta, Artery, Capillaries, :
Blood Vessels• Arteries:
• Almost all carry oxygenated blood (expect pulmonary artery).
• As the arteries get further from the heart, the lumen (centre of the artery) gets smaller.
• Walls are made of elastic fibres and smooth muscle.
Keywords: Circulatory system, Aorta, Artery, Capillaries, :Keywords: Circulatory system, Aorta, Artery, Capillaries, :
Blood Vessels• Capillaries:
• Minute vessels• Oxygenated blood enters. • Allow exchange of oxygen and food into cells. • Allow exchange of carbon dioxide and other
waste back into the blood – to be removed by the body.
• Have very thin walls to allow exchange to take place.
• Deoxygenated blood leaves.
Keywords: Circulatory system, Aorta, Artery, Capillaries, :Keywords: Circulatory system, Aorta, Artery, Capillaries, :
Blood Vessels• Veins:
• Almost all carry deoxygenated blood (expect pulmonary vein).
• Main vein is the Vena Cava which carries blood to the heart.
• Have a large lumen. • Walls are made of thin layer of smooth muscle
with few elastic fibres.
Keywords: Circulatory system, Aorta, Artery, Capillaries, :Keywords: Circulatory system, Aorta, Artery, Capillaries, :
Model Blood:
Keywords: Circulatory system, :Keywords: Circulatory system, :
Cold tea without milk to represent plasma
Red lentils to act as red blood cells
Small marshmallows to be white blood cells
Porridge oats to represent platelets
Salt/sugar to demonstrate dissolved nutrients
Question:
What do the different parts of blood do?
Keywords: Circulatory system, :Keywords: Circulatory system, :
Part of Blood Role
Red blood cells These carry oxygen around the body.
White blood cells These form part of the immune system to fight infection/disease.
Platelets Platelets are irregularly-shaped, colourless bodies that are present in blood. Their sticky surface lets
them form clots to stop bleeding.
Blood plasma The liquid part of blood where cells float in.
Oxygenated and Deoxygenated blood:
In the lungs, oxygen diffuses into the blood to form oxygenated blood (red blood).
The oxygen is delivered to the cells around the body, where oxygen diffuses out of the blood into the cells. The blood is now deoxygenated (blue blood).
In return, carbon dioxide diffuses out of the cell into the blood.
The blood returns to the lungs to allow the carbon dioxide to diffuse out, and oxygen in.
Keywords: Circulatory system, :Keywords: Circulatory system, :
body’scells
lungslungs
More about Red Blood Cells
These are very important cells. They carry oxygen around the body.
They have NO nucleus, so that they can pack in more oxygen.
When they carry oxygen – they are oxygenated.
When they have no oxygen – they are deoxygenated.
Keywords: Circulatory system, :Keywords: Circulatory system, :
More about Blood
Respiration also need GLUCOSE to be transported to every cell.
Keywords: Circulatory system, :Keywords: Circulatory system, :
Review Objectives
I still feel unsure. I need some more help to understand.
I feel ok. I need to do some more work to check my understanding.
I am happy and feel I understand and can explain the main points.
Keywords: Circulatory system, Aorta, Artery, Capillaries, Atrium, Ventricle, Aorta,
Vena Cava ::Keywords: Circulatory system, Aorta, Artery, Capillaries, Atrium, Ventricle, Aorta,
Vena Cava ::