Starter 1. Where do these items go when we eat them? 2. How do they move around our body? 3. Why are they needed?

Starter

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?


Respiration

Question:

What is the full word equation for this process?


Respiration:

Oxygen + Glucose Carbon dioxide + Water (+ Energy)

Question:

How do the materials needed and produced by this process get around the body?


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.


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).


Force• Squeeze a tennis ball – this is

about the force the heart needs to pump blood around the body.


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.


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.


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.


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.


Model Blood:


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?


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.


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.


More about Blood

Respiration also need GLUCOSE to be transported to every cell.


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 ::

Documents

Starter 1. Where do these items go when we eat them? 2. How do they move around our body? 3. Why are they needed?