Activity 7 : A MODEL OF THE CIRCULATORY SYSTEM
What are the parts of the circulatory system ? How do they work ?
You will use these model of the circulatory system .
1. Look at the heart in the model .
The heart is completely divided into 2 halves .
a. what are the parts of the left half ?
b. what are the parts of the right half ?
2. Look at the blood tubes . trace them with your fingers starting from the heart .
c. The blood tube from the right ventricle leads to the ___________
d. The blood tube from the left ventricle leads to the ____________
These blood tubes are the arteries . They carry the blood from the heart to thge lungs and rest of the body .
3. Trace the blood tubes
* From the body back to the heart.
* from the lungs back to the heart.
e. The blood tube from the body leads to the _____________
f. The blood tube from the lungs lead to the __________________
These blood tubes are the veins . They carry the blood from the lungs and the rest of the bodyback to the heart .
4. Look at the liquid in the model .
Red liquid represents blood rich in oxygen .
Colorless liquid represents blood poor in oxygen .
5. Make the heart pump blood by pressing the ventricles repeatedly and at the same time .
g. How many pumps does the heart have ? __________
what are these pumps ? ________________
h. What happens to the color of the liquid when it reaches the body ? __________
i. What does this change in color show ? ___________
j. What happens to the color of the liquid when it reaches the lungs ? ___________
k. What does this change in color show ? ______________