Introduction
The introduction:
As you know from your previous studies, the digestive system changes the complex food particles into simpler ones to let the cells get benefit from them. Also; the respiratory system allows oxygen to enter the body to burn the digested food and produce energy in the cells.
The question here is, how the digested food and oxygen reach the cells of the body?.
Task
The task:
Consider that we have no water taps in the science lab; how can you deliver the water here from the other room?
If you have two equal containers with equal amounts of water, does the water move from one container to the other one or not?
Process
The process:
You have some containers and rubber tubes.
try to deliver the water from the other room to this lab and write your information and tools.
after that, try to make water move from one container to the other.
http://questgarden.com/07/10/8/051101114028/
The students need different containers to transfer water from one room to another.
The water needs a push to transfer between different containers.u
Evaluation
- What do you need to bring water from place to another?
" how different substances are transferred through the body?"
- Does the transfer of water need a force? What is the role of the heart?
Conclusion
The digested food and oxygen are dilevered to the cells through different tubes and containers called " blood vessels ".
The heart is the pump which pushes the blood all over the body exactly as the force of tap water when it pushes the water through the tubes.
Teacher Page
The human circulatory system is an important vital system in the body.
Its main function is delivery of different substance "food, water, oxygen, CO2 and other wastes" from and to the cells and specialised excretory systems.