1. For each cup, put one straw in the hole. Put the larger diameter straw in the cup with the larger hole. Put the smaller diameter straw in the cup with the smaller hole. Make sure the hole is not squeezing the straw and narrowing it.

2. Use play dough, clay, or silly putty to seal the hole inside the cup and around the straw so that water cannot leak out of the hole. Why do you not want water to leak out the holes? How might that change your experiment?
If the water leaks out, the rate of water flowing will not be accurate.

3. Make sure the straws are pointing down so that the water can flow out.

4. Do you think the straws will have the same or different flow rates? Why?
They will have different flow rates because the size of them is different.

5. Put both cups in a pan or basin. Quickly fill both cups with water. Fill them to the same level. Either fill the cups at the same time, or fill the cup with the smaller diameter straw first. Watch carefully to see if water stops flowing from the two cups at the same or different times.

6. If you have enough water, refill the cups and watch again. Do this several times to see if the results are always the same.

7. Does water stop flowing out of the two cups at the same or different times? What does this tell you about the flow rate? Is the flow rate of a straw with a large diameter the same or different from the flow rate of a straw with a small diameter?
Water stops flowing out at different times. It tells me that the flow rates of the water flowing out the two cups are different. The flow rate of the larger straw is higher than that of the smaller straw.

8. Based on your experiment what do you think happens to the flow rate of blood during coronary heart disease? Hint: Remember that people with coronary heart disease have arteries with smaller diameters.
When a person has coronary heart disease, his arteries, which transports oxygen-rich blood throughout the body, will be smaller. The blood will be transported in a slower rate, thus his heart rate will be higher than normal people.

Our body will be lethargic because it would not be able to make enough energy. When this continues, it may even lead to death.

Oxygen is important because it produces energy we need.

When you exercise, you get to use more energy. When you need more energy, your body needs to produce more of it, and thus you will breathe in more and the blood will carry more oxygen throughout the body. This makes the heart beat rate increase.

Breathing is the action where you breathe in and breathe out, whereas respiration is a process where oxygen that is inhaled gets carried throughout the body by the blood to produce energy, and carbon dioxide is exhaled.
Respiration= sugar + oxygen = carbon dioxide + water + energy