Page 23 - 新思维科学教师用书6 试读样张

1 THE HUMAN BODy

Resources: Plastic washing-up liquid bottle filled
Starter ideas with water, red food colouring, dropper, basin
1 Getting started (10–15 minutes) Description: This activity demonstrates how the
Resources: Learner’s Book; Digital Classroom: heart works like a pump to push the blood all the way
Activity: The human body (optional) or a human round the body. It is not found in the Learner’s Book.
body outline per pair Learners will make a simple model from a plastic
Description: This activity draws on learners’ existing washing-up liquid bottle filled with water which they
knowledge about body organs from Stages 3 and 4. squeeze to simulate the pumping action of the heart.
Tell learners to work in pairs to read and answer the Explain that by squeezing the bottle you put pressure
questions in the Learner’s Book. on the water which makes it squirt out of the bottle.
Give each pair an outline of the human body. Ask The heart works in the same way.
them to draw in and label on the outline the organs Challenge learners to squeeze the bottle as many
they named in the questions. times as they can in one minute. Are they able to
You can ask them to put up their hands to volunteer squeeze it more than 70 times? Explain that this is
to share their answers and show their filled-in body how hard the heart has to work all the time.
outlines. Practical guidance: Learners should work in pairs
Ask the class to give their opinions of the answers or small groups. They should fill a plastic washing-
given. Do they agree with the answers? Would they up liquid bottle with water. They can add a drop of
like to share any of their own ideas about the answers? red food colouring into the water to give it the same
Digital Classroom: If you have access to the Digital colour as blood.
Classroom component, use the activity ‘The human body’ Learners should squeeze the bottle to simulate the
to revise and establish learners’ knowledge of organs in the pumping action of the heart. They should do this over
body. The i button will explain how to use the activity. the basin to avoid spilling water on the desk. They

2 What can you hear? (10–15 minutes) should not point the bottle at another learner when
Resources: Each pair of learners will need the inner they squeeze it. Learners will observe that the water is
pushed out of the bottle with force.
cardboard tube of a roll of kitchen paper towel (or
toilet paper roll or paper cup with the bottom cut out) Differentiation ideas: More confident learners
Plastic washing-up liquid bottle filled with water. can do some research to find out why we can hear
our heart beating. They should find out that the
Description: Have learners work in same gender sound of the heartbeat is made by the pressure of the
pairs and put the inner cardboard tube of kitchen blood being squeezed out the heart when the muscle
paper towel on the chest of their partner and listen. contracts.
Tell them that they may move the tube around until
they hear something. Ask learners what they hear and 2 Activity 1: Compare the circulatory
where they think the sound is coming from. Explain systems of some vertebrates
that the sound is the heart beating. (20 minutes)
You can bring in the Science in Context strand of the Learning intention: To learn that the circulatory
curriculum by telling learners that the first stethoscope systems of other animals are similar to ours.
that was ever used to listen to the heart beating was a
wooden tube. It was used in the same way as learners’ Resources: Learner’s Book; Worksheet 1.1 (optional)
card tubes. If possible, show the class what a modern Digital Classroom: Video: The circulatory system
stethoscope looks like or refer to the picture in the (optional) or internet video clip on the circulatory
project for this unit in the Learner’s Book. system
Talk about what the heart does and how it does it. Description: If you have access to the Digital
Classroom component, show the video ‘The circulatory
Main teaching ideas system’, which shows clips of the heart beating and
blood flowing in the human circulatory system.
1 How the heart works (10 minutes) Alternatively, do an internet search for a video clip on
Learning intention: To demonstrate how the heart the human heart and circulatory system. You can use
works. search terms such as ‘how your heart works’ or ‘the

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඀ࠡ JOEC