VHS+Science+Lesson+12

Today we are going to learn about how organisms are made of cells.



What is going on here? What kinds of work do your cells do? How are cells working here?



Every living thing has parts that work together. From cells to organs, each part of the body has a job. The parts are called structures, and the kinds of work they do are called function.

Do you have a function? What is it?

= Cells at work!! = You can see how the parts of your body work when your skin is cut or scraped. Your circulatory system delivers blood cells that repair it. (blood cells) Blood carries nutrients to body cells.

(Blood vessels) When you get a cut, blood travels to the wound through blood vessels.

(skin repair) White blood cells attack germs and infections.

(healing body) Skin protects the body. To repair broken skin, blood forms a scab to seal the wound.



media type="youtube" key="0TvTyj5FAaQ" width="560" height="315"

media type="youtube" key="JnlULOjUhSQ" width="420" height="315"

Part 2 = How Organ Systems Work =

Your body works because it runs on an organized set of systems. Systems let you breathe, eat, stand up, and move. They control your body's activities and get rid of things you don't need. Each system begins with small cells.



Let's look at what happens to food you eat. It goes into your mouth, which is the beginning of your digestive system. This makes it possible for you to eat and get nutrients from food. Many kinds of cells and tissues make up the organs of your digestive system.

Organs work together in organ systems. For example, your digestive system includes your stomach. It also includes such organs as your intestines and liver. All these organs work together as part of the digestive system. Are any of these systems connected? How so?

What are some differences between a cell and an organ system?

Have you ever forgotten to water a plant? It doesn't take long for it to die without water.

Many plants have a transport system that keeps water moving in their cells and tissue. Humans also need a transport system to move water and nutrients. All organisms move materials in their cells. Nutrients such as oxygen and nitrogen need to travel throughout the body.

= Organs, Tissues, and Cells =

The human circulatory system is powered by the heart, an organ. The heart pumps blood through the lungs and around the body.



The human circulatory system is built with lots of blood vessels. Arteries carry blood away from the heart. Veins carry blood back to the heart.

The plant vascular system moves water and food. It also keeps the plant from falling over. To stay alive, the body has different structures that perform functions (or jobs). Each cell, tissue, and organ has a specific job in its organ system.

How are the transport systems of plants and animals alike?

media type="youtube" key="bwBM2Pa1LA8" width="420" height="315"