Unit 4: Staying alive

Look at this picture of the inside of the human body.

Point to your own body to show the position of your brain, heart, lungs, stomach and intestines.

Write a sticky note to say what you think each of these parts of the body does.

Can you feel your heart beating?

Have you felt your heart beat faster after you have been running or playing?

Marcus and Zara are investigating how their hearts speed up when they exercise. Look at the bar chart.



What was Zara's heart rate before the exercise?

(Write the number of beats per minute.)

Marcus and Zara are investigating how their hearts speed up when they exercise. Look at the bar chart.



What was Zara's heart rate after exercise?

(Write the number of beats per minute.)

Marcus and Zara are investigating how their hearts speed up when they exercise. Look at the bar chart.



What was Zara's heart rate after two minutes of rest?

(Write the number of beats per minute.)

Marcus and Zara are investigating how their hearts speed up when they exercise. Look at the bar chart.



The bar chart shows a pattern. Do you think the same pattern always happens when you exercise and then stop?

Now use a watch to take the pulse of a friend at rest, after 1 minute's exercise and again two minutes later. Do you see a similar pattern of an increase in heart rate followed by a return to the resting heart rate?

How many breaths in one minute?

Predict how many breaths you will take in one minute. Predict the number at rest and then predict the number after exercise.

While you sit at rest, count the times you breathe in during one minute. This is your breathing rate, at rest.

Then after one minute of gentle exercise, count your breaths again for one minute. This is your breathing rate after exercise.

Make a table from your results. Use these column headings:

| My prediction of breaths in one minute at rest | My prediction of breaths in one minute after exercise | Number of breaths in one minute at rest | Number of breaths in one minute after exercise |
|:-:|:-:|:-:|:-:|
| | | | |

Were your predictions right?

Sofia and Marcus tested the breaths per minute of two teachers. They recorded the results in this table.

| Person | Age | Prediction at rest | Breathing rate at rest | Prediction after exercise | Breathing rate after exercise |
|:-|:-:|:-:|:-:|:-:|:-:|
| Sofia | 11 | 20 | 26 | 40 | 50 |
| Marcus | 11 | 35 | 27 | 45 | 48 |
| Mr. Zan | 31 | 30 | 23 | 40 | 41 |
| Mrs. Bell | 29 | 25 | 24 | 35 | 39 |

Why does the breathing rate per minute always increase after exercise?

Sofia and Marcus tested the breaths per minute of two teachers. They recorded the results in this table.

| Person | Age | Prediction at rest | Breathing rate at rest | Prediction after exercise | Breathing rate after exercise |
|:-|:-:|:-:|:-:|:-:|:-:|
| Sofia | 11 | 20 | 26 | 40 | 50 |
| Marcus | 11 | 35 | 27 | 45 | 48 |
| Mr. Zan | 31 | 30 | 23 | 40 | 41 |
| Mrs. Bell | 29 | 25 | 24 | 35 | 39 |

Whose breathing rate per minute increased most?

Sofia and Marcus tested the breaths per minute of two teachers. They recorded the results in this table.

| Person | Age | Prediction at rest | Breathing rate at rest | Prediction after exercise | Breathing rate after exercise |
|:-|:-:|:-:|:-:|:-:|:-:|
| Sofia | 11 | 20 | 26 | 40 | 50 |
| Marcus | 11 | 35 | 27 | 45 | 48 |
| Mr. Zan | 31 | 30 | 23 | 40 | 41 |
| Mrs. Bell | 29 | 25 | 24 | 35 | 39 |

Why was the breathing rate per minute of the adults lower than that of the children?

What organ makes the blood travel around your body?

Can you remember a time when you had to think very hard?

Do you know a game that makes your brain work hard?

Exercising your brain!

Play a game of noughts and crosses with a friend.

Did the game make you think? To win you have to think hard.

Now think of a way to make the game better. Could you have three players? or a 4 × 4 table?

Work out how to play the new game.

Show the new game to your friends.

Did this make your brain work? Have you tried some new ideas? Did you feel your brain working hard?

Organ quiz

Cut a sheet of paper into four pieces. On each draw one of these body organs: the heart, lungs, brain, stomach and intestines. Turn each piece of paper over. Ask a friend to choose one, which they then show to you. You have to say the name of the organ and tell them what the organ does. Then write this on the back of the paper.

Take it in turns to do the rest. Did you both get them right?

- What is happening in the picture?
- What will happen next in the life of this animal?
- What body parts can you see on these animals?

Look at the animals shown in the table. Point to their different body parts.

Think of another animal for each group.