Teachers TryScience

Human Blood Circulatory System

Jun 21 2016

Source: vascsc-tts-guj

Summary Information

Keywords:

Lungs, Heart, auricles, ventricles, Arteries, Veins, oxygen, carbon dioxide, blood, circulation

Topic:

Physical Science

Biology

Workplace Skills:

Raising Questions

Problem Solving

Investigation Design

Discussion

Independent Thinking

Estimated Time Required:

2-3 hours

Target Grade (Ages):

Grade 7 (Ages 12-13)

Grade 8 (Ages 13-14)

Grade 9 (Ages 14-15)

Grade 10 (Ages 15-16)

Diversity Indicators:

This lesson is suitable for students and teachers of Grade 7 to Grade 10 who are in a multi level classroom.

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LESSON

Goals and Prerequisites

Goals:

To be able to explain the process of blood circulation.
To be able to evaluate their own experimental designs.

Prerequisites:

Students should:

Be familiar with the biological process of human blood circulatory system.
Understand the basic anatomy of heart and how blood circulates and gets purified in it.

Instructional Objective(s)

Design an experiment to study the process of blood circulation in human body.
Students should also be able to understand the working of all the organs involved in the process.

Instructional Resources

Background:

The heart pumps oxygenated blood to the body and deoxygenated blood to the lungs. In the human heart, there is one auricle and one ventricle for each circulation, and with both a systemic and a pulmonary circulation there are four chambers in total: left auricle, left ventricle, right auricle and right ventricle.

The right auricle is the upper chamber of the right side of the heart. The blood that is returned to the right auricle is deoxygenated (poor in oxygen) and passed into the right ventricle to be pumped through the pulmonary artery to the lungs for re-oxygenation and removal of carbon dioxide.

The left auricle receives newly oxygenated blood from the lungs as well as the pulmonary vein which is passed into the strong left ventricle to be pumped through the aorta to the different organs of the body.

Materials:

4 small plastic bottles, 2 big plastic bottles, Plastic funnel, Plastic pipe, U- foam sheet, Saffranin stain solution / red food color dissolved in water / any red color liquid (to represent blood), Starch powder / any off-white color liquid (to represent oxygen) , any strong adhesive ; preferably Fevikwik, soldering iron / glass rod / incense stick (for making holes in plastic bottle)

Procedure:

Take two big plastic bottles mark them as A and B. Take four small plastic bottles and mark them as 1, 2, 3 and 4.
As we are using plastic bottles, hole can be made with the help of soldering iron / by heating a glass rod / incense stick. The diameter of the hole should be equal to diameter of the plastic pipe. Make hole in the centre of the cap as well as at the centre bottom of all six bottles.
First insert the pipe in the bottle A passing it from the hole on the cap to the bottom hole.
Continue inserting the same pipe in a similar way in bottle 1 and then bottle 2. Set both the bottles one below another.
Then insert the same pipe in same way in holes of bottle B (from top to bottom).
Now continue inserting the same pipe in bottles 3 and 4 and arrange it one below another.
Make a small hole in the pipe going into bottle B ( the portion of the pipe at a small distance away from the cap of bottle B)
Take a separate small piece of pipe and insert into the same.
Now set whole assembly on the foam sheet.
Stick bottle A first and then besides it stick bottle 1 and 2 (one below another).
Stick bottle B at the other end of the foam sheet leaving space (in between bottle B and bottles 1 and 2) for bottles 3 and 4.
Stick the remaining bottles, 3 and 4 besides bottles 1 and 2 (the space we left while sticking bottle B).
Wherever pipe has to be sticked, stick it properly taking into consideration that it does not bend.
Now take the funnel and put on the pipe of bottle A and add any red color solution into it.
At the same time, put the funnel in the pipe inserted separately above bottle B and add off-white color solution into it once the red color solution is about to enter the pipe of bottle B.
Observe the path of the red color solution and the color changes in it.
After using it, you can also reuse the model by running tap water through both the funnels. Through this, your model will get cleaned.
Note: Refer the attached resources.

Extensions

Students can study how heart and lungs are involved in the human blood circulation process.
Students can further research on how the human blood circulatory and respiratory systems work together to promote gas exchange.

RESOURCES

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