Comparison between Circulatory system and road ways
The circulatory system is a covered system i.e it is not open to the atmosphere.
It is made of several tubes (arteries, capillaries, veins etc,) which carry fluid throughout the body. The system of roads is also similar to our circulatory system i.e it has many roads some meet at a point while some go over each other in the form of bridges, some pass through tunnels, some are expressways or highways.

Unlike the Circulatory system which is covered the road network is open to the atmosphere.

Just as the tubes in the circulatory system carry fluid the vehicles move from one end to the other end of the road. One of the functions of the circulatory system is that it can deliver materials like oxygen and nutrients to the cells in the same way roads help in delivering goods from one place to another. Blood in the Circulatory system moves only in one direction but the roads have the advantage of letting the vehicle move in both the direction.

The blood in the circulatory system follows a definite path while the vehicles are free to follow any path.

If there are impurities in the blood the Circulatory system helps in carrying the impure blood to the heart .The disadvantage with road network is that If there is a road accident there is going to be a traffic jam. Until an external source move the damaged vehicle. These are the similarities and differences between the circulatory system and the road network.

1. What three functions does the cardiovascular system perform?

The three functions that the cardiovascular system performs are

1. Delivery of materials (oxygen and nutrients) to the cells.
2. Removes waste.
3. Fighting disease.

2. Distinguish between substances that the cardiovascular system transports to cells and substances that it transports away from cells.

Substances that the cardiovascular system transports to cells are Oxygen and nutrients and substances that it transports away from cells are waste products like carbon dioxide, diseases causing micro organisms

3. List four chambers of the heart. What structures in the heart separate one chamber from another?

The four chambers of the heart are:
1. Left Atrium
2. Right Atrium
3. Right Ventricle
4. Left Ventricle

The Septum separates the left side of the heart from the right side (it does not allow the pure and impure blood to mix). The valves separate the atria and the ventricle (it prevents the blood from flowing back from the ventricle into the atria).

4. What function does the heart perform?

The function of the heart is to pump blood to all the parts of the body.

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 not work properly the blood would flow back from the ventricle into the atrium instead of flowing to the lungs, which will cause death.

6. Where does blood returning from the body enter the heart? b. Where does the blood move next?

The blood returning from the body enters the right atrium. Then the blood from the right atrium enters the right ventricle from here it moves to the lungs.

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 artery leaving the right ventricle has less oxygen while the blood in the artery leaving the left ventricle is rich in oxygen. The artery leaving the right ventricle carries blood to the different parts of the body.

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The human wouldn't have survived because people need food for energy and if they don't have a stomach they will be died in approximately 12 hours

Digestive system

This lesson is designed for you to use the Internet to learn about the digestive system. Type in the following address:

Follow the instructions on the sheet to answer the questions. Remember to only click where the sheet tells you to.

1. What is digestion?

The fuel that a human body needs to survive is taken in the form of food. But eating is just the beginning of the process that actually provides the energy / fuel for the body to function. The process that follows eating is called digestion; it is a process in which the food is broken down into chemicals that the body can use.

2. Click on Mouth and Teeth. What is the purpose of the teeth in the digestive system?

The teeth in our mouth play an important role in breaking down the food we eat. As we chew, our teeth shred and grind the food particles and powerful muscles move the mandible. Teeth in the front are used to cut the food while the teeth behind grind it using Saliva

3. What is Saliva used for and what helps it do it’s job?

Saliva is a watery mixture secreted from the salivary glands. Saliva is used for Digestion. It lubricates the mouth and starts the process of digestion by softening the food. It contains an enzyme that helps in breaking down the starch in the food.

4. Where does the food go next?

After chewing, the food is swallowed and passes down the stomach through the esophagus.

5. What is the purpose of the tongue in the digestive system?

The tongue helps push the food to the back of the mouth

6. Click on Next at the bottom. Name 2 ways food is broken down in the stomach.

2 ways in which the food is broken in the stomach are first mixing the food with the acids and the second is the movement of the stomach muscles that helps in breaking the food.

7. How is the stomach protected?

The stomach is covered with a lining which protects it from the acid.

8. Where does the food go next?

Next the food which is now in the form of pulp is sent to the small intestine little bit at a time.

9. How long is it?

Small Intestine measures about twenty feet in length, and is one inch in diameter.

10. How does food move in the small intestine and what is this movement called?

Wavelike muscular contractions called peristalsis helps to move food along the small intestine. This motion is much the same as squeezing a tube of toothpaste.

11. What are villi and what do they do?

The millions of fingers that line the small intestine are called Villi. They absorb the chemicals from the food that are needed by our body; this is when our body actually gets food

12. What is the last section of the digestive system called?

The last section of the digestive system is called colon.

13. Click on Next at the bottom. Read the information and write down how each of the following three organs aid in digestion:

Pancreas: People whose pancreas cannot produce insulin suffer from dieabetes


Gall Bladder:

Mouth: Mouth is the first place where the digestion starts.

Esophagus: Esophagus is a long tube leading to the stomach.

Stomach: Stomach is the place where the food is mixed and churned and sent to the small intestine. Food goes slowly down into the small intestine.

Small intestine: Small intestine is the place where there are millions of figure absorb the nutrition needed for our body. The figures are called Villi.

Large intestine: Large intestine is the last place for digestion from there the food is thrown out of the body in two ways one is the liquid and the other is solid, through the anus