Lesson video

Hello, everyone.

How are you today?

I hope you're feeling really good.

My name is Ms. Afzal, and I'll be your teacher for this lesson.

I'm feeling really pleased about that because we've got such an interesting topic ahead.

We are going to be looking at blood.

I wonder if it's something you've thought about much before in your life.

We've got blood moving all around our bodies and hmm, how much do we actually know about it?

Well, we're going to be finding out today in our lesson.

Our lesson is called "The function of blood" and it comes from the unit of work, The circulatory system.

So if you're ready with some focus, energy, and enthusiasm, we are going to get started with our lesson.

The outcome for today's lesson is: I can describe what blood is and what it does.

I hope that sounds of interest to you.

We have some keywords in our lesson.

Let's go through them one at a time.

My turn, your turn.

Blood.

Function.

Nutrients.

Oxygen.

Carbon dioxide.

Great to hear those keywords.

Let's find out what they mean.

Blood is a liquid that travels around the body and carries oxygen, nutrients, and waste.

The job that something does is its function.

Nutrients are substances that living things use to stay alive and healthy.

Animals take in nutrients from their food.

Oxygen is a type of gas found in Earth's atmosphere that is vital for living things.

Carbon dioxide is a type of gas found in Earth's atmosphere.

So these are our keywords: blood, function, nutrients, oxygen, and carbon dioxide.

Pause here and share with someone, which of these words had you heard of before?

Thanks for sharing.

So let's be on the lookout for these words and listen out for them and think carefully about them.

They'll be coming up in our lesson today.

Our lesson is called "Function of blood" and it has two learning cycles: the functions of blood and the parts of blood.

Let's begin by exploring the functions of blood.

Humans cannot live without blood.

We need blood to keep us alive.

Here's Aisha.

"I know that blood is important to us, but I don't actually know what it does.

Do you?

" And here's Andeep.

"Blood has many different functions.

I think it carries out important things around the body.

" Do you agree with Andeep?

Pause here and share with someone nearby.

Thanks for sharing.

Let's have a check for understanding.

I'd like you to tick one box for each statement.

So we've got three statements: A, blood transports oxygen around the body; B, blood transports nutrients from food around the body; C, blood transports water around the body.

And then we have got four boxes.

I'd like you to tick one of these.

Either you can tick for each statement I'm sure this is correct, I think this is correct, I think this is incorrect, I'm sure this is incorrect.

So pause here while you tick one box for each statement.

So how did you get on with that check for understanding?

Well done if you ticked this box because indeed, blood does transport oxygen around the body.

Well done if you ticked this box, blood transports nutrients from food around the body.

And well done if you ticked this box, blood transports water around the body.

These statements are all correct.

When we eat, nutrients from food, such as vitamins and proteins, are absorbed into our blood through the small intestine.

Fruit and vegetables are good sources of vitamins.

Oh, they're looking very enticing.

A function of blood is to transport water and nutrients from food around the body to where they're needed.

This helps our body to grow and repair in order to stay healthy and strong.

Let's have a check for understanding.

Blood is needed to.

.

.

Complete the sentence in one of these three ways.

A, act as a pump to the lungs; B, keep us alive; C, feed us.

Pause here while you decide how to complete the sentence.

Well done if you chose statement B.

Blood is needed to keep us alive.

When we inhale, air enters our body and travels down into our lungs.

And there we can see what lungs look like and then we can see the way that air is being drawn down into the lungs.

Although we take in air containing many gases, our body uses only oxygen.

Oxygen and air passes from the lungs into our blood.

A function of blood is to transport oxygen to all the parts of the body so they can keep working.

And here we can see in this image blood traveling around the body.

Let's have a check for understanding.

Fill in the blanks in this sentence.

Blood transports and to all the parts of the body so they can keep working.

And here are some options for words that you can use to fill in the blanks: A, oxygen; B, waste; C, nutrients; D, carbon dioxide.

Pause here while you fill in the gaps in the sentence by choosing two of these words.

Well done if you completed the sentence in this way: blood transports oxygen and nutrients to all the parts of the body so they can keep working.

When blood delivers oxygen to different parts of the body, carbon dioxide is taken away.

Carbon dioxide is a waste gas that your body does not need.

"If we don't need carbon dioxide gas, what do we do with it?

" Good question, Aisha.

Pause here and share with someone, do you have any idea what happens to the carbon dioxide gas that we don't need?

Thanks for sharing your ideas.

A function of blood is to carry carbon dioxide gas back to the lungs where it is removed from the body in the air that we breathe out.

It's exhaled.

And here we can see someone exhaling carbon dioxide.

Aisha has fallen in the park and damaged the skin on her leg.

"I've cut my leg and blood is leaking out.

" Ah, yikes.

"Don't worry, it will stop bleeding soon," says Laura.

What do you think causes the bleeding to stop?

Pause here and share with someone.

What do you think?

Thanks for sharing.

Another function of blood is to help humans to stop bleeding if they get cut.

Here's Sofia: "When I scraped my arm, it stopped bleeding and eventually a hard scab appeared.

" Blood forms a scab on the surface of the skin.

This stops us from continuing to bleed if we cut ourselves.

And there we can see a scab.

Perhaps we've all had a scab at some point from a fall or a scrape.

Here's Aisha.

"I've heard that when you're unwell, your blood helps you to get better.

" Another function of blood is to fight infection caused by germs like bacteria and viruses.

Our blood is working very hard, has a lot of functions.

The heart pumps blood around the body.

Without blood, oxygen, nutrients, and water would not be able to get to the parts of the body that need it to function.

Carbon dioxide and other waste products would not be able to leave the body.

Your body would not be able to fight infection, and you would not be able to form scabs to heal cuts.

Oh my, this blood is working so hard for us.

Let's have a check for understanding.

What substances move from the body into the blood to be taken away?

Is it A, oxygen and other waste materials; B, nutrients and carbon dioxide; or C, carbon dioxide and other waste materials?

Pause here while you decide what substances move from the body into the blood to be taken away.

Well done if you selected answer C.

Indeed, it's carbon dioxide and other waste materials that move from the body into the blood to be taken away.

And now it's time for your first task.

Who do you agree with and why?

Let's hear these three opinions.

Here's Aisha.

"The function of blood is to help make you better if you're not well.

" Interesting.

Here's Laura: "The function of blood is to stop you bleeding if you are cut.

" Also interesting.

And here's Andeep: "The function of blood is to transport different things around the body.

" Oh my.

Some really interesting ideas there.

Who do you agree with and why?

I'd like you to turn to someone nearby and have a discussion about this.

Pause here, and I'll see you when you've had that discussion.

It's great to be back with you.

So how did you get on with that discussion task?

Who do you agree with and why?

Well, all of the children are correct.

I wonder if that's what you decided.

Aisha is correct.

Blood indeed helps you to fight infections when you're ill.

Laura is correct.

Blood helps the body to form scabs to heal cuts.

And Andeep is correct.

Blood delivers oxygen and nutrients to parts of the body that need it.

It transports waste such as carbon dioxide back to the lungs to be removed from the body in the air we breathe out.

Well done if you agreed with all of these children.

And now we're on to our next learning cycle, the parts of blood.

Human blood appears to be a red liquid, but it's actually made up of a liquid and solids that are too small to see without a microscope.

Human blood is made up of these four things: plasma, red blood cells, white blood cells, and platelets.

And each part has a function within blood.

We can show the different parts of blood in a model diagram.

Pause here and share with someone, do you have an idea what are the different parts of blood?

So we've got red blood cells, white blood cells, plasma, and platelets.

Pause here and share with someone.

Can you have a go at identifying what those different parts might look like?

Thanks for having a go at identifying them.

Let's take a look.

So these are the platelets.

Here are red blood cells.

These are the white blood cells.

And the yellowish liquid that they're all sitting in is the plasma.

Let's have a check for understanding.

Which of these is not a part of the blood?

A, plasma.

B, red blood cells.

C, scabs.

D, white blood cells.

Pause here while you decide which of these is not a part of the blood.

Well done if you selected answer C, scabs, as we know that plasma, red blood cells, and white blood cells are all parts of the blood.

Plasma is a yellowish liquid that carries the red blood cells, white blood cells, and platelets around the body.

Now we can see in this image the plasma being extracted from the blood.

Plasma also transports water, nutrients, and waste products around the body.

Here's Aisha: "I wonder why blood is red when it's mostly made from plasma, which is a yellowish liquid.

" Do you have any ideas?

Pause here and share with someone.

What do you think?

Thanks for sharing your ideas.

Here's Andeep: "Our blood is red because it contains millions of red blood cells.

They travel through the body with the help of plasma.

" And here's Laura: "Red blood cells look similar to a donut without a hole.

" There is a model of red blood cells.

So fascinating.

Red blood cells are very important.

They carry oxygen from your lungs to all the parts of your body that need it.

Red blood cells travel back to the lungs, taking away carbon dioxide to be exhaled from the body.

Human blood also contains white blood cells, which are responsible for fighting infection caused by germs like bacteria and viruses.

And here's a model of what a white blood cell could look like.

And Andeep says, "This looks very different to a red blood cell.

" Absolutely it does.

Pause here and share with someone, how does it look different to a red blood cell?

Thanks for sharing your observations.

Platelets in blood help to form scabs on the surface of the skin.

This stops us from continuing to bleed if we cut ourselves.

Here's Sofia: "When I scraped my arm, it stopped bleeding and eventually a hard scab appeared.

" And there's a model of a platelet.

Let's have a check for understanding.

True or false?

Human blood is made up of different parts.

Pause here and decide, is this true or false?

Well done if you said true.

And now I'd like you to justify your answer by selecting from one of these two statements.

A, blood is made up of plasma, red blood cells, white blood cells, and platelets, or B, you can't see any parts in blood, it is just a red liquid.

Pause here while you choose one of these statements to justify your answer.

Well done if you chose statement A.

Indeed, blood is made up of plasma, red blood cells, white blood cells, and platelets.

It's made up of lots of different parts.

Let's have another check for understanding.

Which part of the blood helps to form a scab if you get cut?

Is it A, plasma; B, platelets; C, red blood cells; or D, white blood cells?

Pause here while you decide which part of the blood helps to form a scab if you get cut.

Well done if you selected answer B.

Indeed, it's platelets that are the part of the blood which help to form a scab if you get cut.

Andeep, Aisha, and Laura decide to make a model to describe what blood is and its functions.

Here's Aisha: "Models help us to understand things we cannot see in real life.

" And Laura says, "I'd like to use apple juice to represent the yellowish plasma.

" Yeah, makes sense.

And Andeep: "We could use white pompoms to represent white blood cells.

" Nice thinking.

Let's have a check for understanding.

Why might you create a model of blood?

A, blood is interesting to look at as a model; B, it's nice to be able to look at models; or C, you can't see the separate parts of blood without a microscope.

Pause here while you decide why you might create a model of blood.

Well done if you selected answer C.

It's because you can't see the separate parts of blood without a microscope.

That's why you might like to create a model of blood.

And now it's time for your task.

And I wonder if you guessed that this is what's coming.

You are going to plan a model to describe what blood is and its functions using Aisha and Andeep's ideas or your own.

Here's Aisha: "We have some water, yellow food dye, and raisins.

These could be the plasma and platelets.

" And Andeep: "We've also got cereal hoops, red food dye, and mini marshmallows.

These could be the red and white blood cells.

" Love these ideas.

Draw a diagram of what each part represents in your model and even have a go at making it.

So pause here while you get super creative and plan your model to describe blood and its functions.

Draw a diagram of each part, and you could even have a go at making your own model.

I'll see you when you're finished.

It's great to be back with you.

So how did you get on with that task?

Planning your own representation of blood, your ideas may have been similar to this.

Here's Andeep: "We created our own model of blood using different items.

Raisins were similar to platelets.

" Love that.

"We used cereal hoops and red food dye to create red blood cells.

Their circular shape were perfect.

" "Plasma was recreated by using vegetable oil because it is a yellow liquid.

" "Small marshmallows were great to use for white blood cells as they were white and fluffy.

" Oh my, this has all come together so nicely.

Love this model of all the different parts of blood, and I hope you enjoyed planning and maybe even making your own.

In our lesson "Function of blood," we've covered the following.

Blood is needed by humans to keep them alive.

Blood transports oxygen and nutrients to all the parts of the body so they can keep working.

Blood transports carbon dioxide and other waste materials to be removed from the body.

Blood is made of different parts.

Each part has a different function within blood.

Models can be used to describe what blood is and its functions.

Well done, everyone, for joining in with this lesson.

It was so great to explore blood together.

What is blood?

Why do we need it?

What jobs does it do?

As we found out, it does a lot of jobs.

It's so important for us.

And what is it made of?

Was great to explore all those different parts of blood and their functions.

And of course, planning and creating your own model of what blood is and how it works.

I hope you've enjoyed this lesson.

I've really enjoyed teaching you, and I'm looking forward to seeing you at another lesson soon.

Until then, stay curious.