Homework

= __May 22__ 1. What three functions does the cardiovascular system perform? delivery of materials to cells – oxygen, glucose removes waste – carbon dioxide = fighting disease – carries white blood cells 2. Distinguish between substances that the cardiovascular system transports to cells and substances that it transports away from cells. Blood in the cardiovascular system moves oxygen to cells and carbon dioxide away from cells. 3. List four chambers of the heart. What structures in the heart separate one chamber from another? The four chambers of the heart are: right atrium, right ventricle, left atrium, and left ventricle. The valves and the septum separates these four chambers. 4. What function does the heart perform? The heart pumps blood with oxygen around the body to get oxygen to cells and organs. 5. What would happen if the valve between the right atrium and right ventricle did not work properly? If the valve between the right atrium and right ventricle did now work it would mean oxygen low blood would not be able to get to the lungs to fill up with oxygen. 6. Where does blood returning from the body enter the heart? b. Where does the blood move next? Blood returning from the heart goes to the R.A, then to the R.V. 7. Review Figure 5. How does the blood in the artery leaving the right ventricle differ from the blood in the artery leaving the left ventricle? To where does the artery leaving the right ventricle carry blood? The blood in the right ventricle is oxygen low blood and the blood in the left ventricle is oxygen rich blood. It carries it to the lungs.

__April 19__

**Writing in Science**
When i sit down to do homework I use many systems in my body. I use my nervous system to feel the chair that I am sitting down to and to actually think and do my homework, and I use my muscular system to move my skeletal system so that I can move. I also use my circulatory system. My circulatory system transports oxygen in blood around my body so that all of my other system can function. But without my respiratory system I would not be able to transfer oxygen from outside to my blood and I would die. All of these systems in my body are vital for doing my homework.

__March 23__
I think we should use a smoother surface to stop the weight from jerking while we pull it up the ramp. The way we read the information was not very accurate and sometimes our info was totally messed up by reading it incorrectly so we should use a tool on the data collectors that finds the average of the force needed.
 * Lab Improvement

__March 8:__ Islamic Museum ** **__//Reflection//__**

The water system consists of many levers, pulleys, and wheels. All of the machines used water to work. Lots of them also used animals like donkeys or horses. Some of the machines were used as pumps and others to move water. The largest wheel used the flow of the water to spin but also had many buckets all the way around that moved water to the to of an aqueduct which brought the water back to the beginning of the system. One of the water movers used a donkey that walked around a pole on a platform to spin gears that led to long spoons that went up and down and lifted the water to another part of the system. This exhibit was also my favorite part of the museum. There were many chemists in the Islamic world. One of them wrote over 200 books on medicine and one man made many new chemistry tools. They all played a large role in current medicine and chemistry. Most of them were interested in discovering new things and were willing to hurt themselves to discover. I learned that there are many scientists in Islamic culture and without their discoveries we would not have nearly as much technology and knowledge that we have now.
 * __Physics/Fav__ **
 * __Chemistry__ **
 * __What I Learned__ **

**__Feb 16th:__**


 * Unbalanced force:

Hitting a golf ball with a club -

http://newsimg.bbc.co.uk/media/images/39213000/jpg/_39213851_golf_ball_203_bbc.jpg

When a golf ball gets hit by a club it does not have enough force against the club to stay where it is. So when it is hit it flies away (wheeeeee!). That makes this situation an unbalanced force.

Balanced force:

Electrons being pulled toward the nucleus by magnetism and being pulled away by another atom's positive force -

** http://www.eskom.co.za/nuclear_energy/fuel/atom.jpg

As you know (or should), an electron has a negative charge, and a nucleus, which contains positive protons, is positively charged. Because the two particles have opposite charges they are magnetically attracted to each other. But it is attracted by other atom's positive force so it trys to move out away from the center of the atom, though the electrons are still always the same distance from the nucleus. This makes the two forces, magnetism and another atom's positive force, equal and balanced.