Year 8 - Science - 13-11-15

Thai Sikh International School

E-Learning Programme – Online Assignment –   12/09/2015

Name:                                                                                                                         Subject: Science

Year   :  Y 8A/B                                                                                                   Schedule No. : 4                                

8B 2 Question Answers

2. Harvey did not find capillaries, Suggest why.
At that time technology was not so advanced and microscopes of high power might not have discovered.
3. What technology was needed before capillaries could be discovered?

Microscope
5 In your group, discuss what scientists have learnt from Harvey about studying the human body.

            Blood travels in one direction.

            Veins have valves

            Blood stops flowing through a body part when it is tied.

            Blood can be pushed towards the heart past the valves, but not backwards away

            from the heart.          

7 Substances pass in and out of capillaries easily. Suggest why. 
Capillaries are many in number which make the substances pass in and out easily.

8 There are blood capillaries close to all your cells. Why is this? 
Blood capillaries closer to our cells provide food and oxygen to every cell.

9 What is your heart mainly made from? 
Muscles

Draw diagram of blood circulation through heart, arteries, veins and capillaries.

Given on page 21