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Beat GED Science Biology of the Human Body Questions

Learn GED science biology of the human body in about 10 minutes to help you get a better score on GED science. What's in this video: 00:00 4 levels of organization 00:11 Cells 00:22 Tissues 00:29 Organs 00:39 Body systems 00:47 How to remember the levels of organization (from smallest to largest) 1:51 Practice question 1 2:30 Practice question 2 2:47 Examples of human body systems 3:18 The circulatory system 4:37 Practice question 3 5:22 Capillary exchange 7:45 The respiratory system 9:40 Practice question 4 Some notes from the video: The human body has 4 basic levels of organization, cells, tissues, organs, and body systems. Cells are the smallest unit of life. In fact, cells are so small, that we can’t see most cells without a microscope. We can think of them as the building blocks of life. Groups of similar cells that carry out a specific function together are what we call tissues. Groups of tissues make up what we call organs. Some common examples of organs are the stomach and lungs. Groups of organs that work together to perform a function are what we call systems, for example, the digestive system. The Circulatory System: -The heart is the key organ of this system. Your heart is a muscle and it pumps blood through the vessels in the circulatory system. You can strengthen your heart by exercising. When your heart pumps blood, the blood goes to your arteries, then capillaries, then veins, then back to your heart again. One way to remember what the arteries do is to look at the first letter of the word, which is A. The Arteries carry blood away from the heart. Hopefully, you see that both the word artery and the word away start with the letter A, so that’s how you can remember that arteries carry blood away from the heart. An easy way to remember what the capillaries do is to look at the first letter of the word, which is C. The capillaries connect the arteries to the veins. Hopefully, you see that both the word capillaries and connect start with c, so that’s how you can remember that the capillaries connect arteries to veins. And lastly, you should know that the veins carry blood back to the heart. So now let’s take a closer look at what the capillaries do. I want you to remember that the capillaries are sites of exchange. -They have little holes or pores in them. Some people like to think of these like holes in swiss cheese, or like little windows, or as a garden hose with holes poked in it. So when you breathe in, you breathe oxygen (which I’ve abbreviated as O2) through your nose and down into your lungs. From the lungs, the oxygen goes into your capillary in exchange for carbon dioxide (or CO2). So when you breathe in, you’re breathing in oxygen, and when you breathe out, you’re exhaling carbon dioxide. And note that this exchange of oxygen for carbon dioxide is happening at the capillaries. Also, CO2 and waste products pass from the cells into the blood at the capillaries, and then you breathe the carbon dioxide out. So now let’s switch gears a little bit now and talk about the respiratory system. The key organs that I want you to remember are the nose, throat, trachea, and lungs. And the key function of the respiratory system is to take in oxygen and to get rid of carbon dioxide, as we’ve already talked about. Now, you might be thinking: I already know what the nose, throat, and lungs are, but what about the trachea. Well, I want you to remember that the trachea is the main airway into the lungs. It’s more commonly called the windpipe We can divide the respiratory system up into the upper respiratory tract and lower respiratory tract. What we call the throat actually has two parts to it: the pharynx and the larynx. The trachea branches into 2 tubes called the bronchi. The Bronchi [now, be aware that there are primary bronchi, secondary bronchi, and tertiary bronchi], but then branch into even smaller tubes called bronchioles, and at the end of each bronchiole is an alveolus. More science videos you might like: Top GED Science Topics to Know for a High Score:    • Top GED Science Topics to Know for a ...   Easily Hack GED Science Graphs to Pass Faster:    • Easily Hack GED Science Graphs to Pas...   Master Photosynthesis for a Better GED Science Score:    • Master Photosynthesis for a Better GE...   Made Simple! GED Science Physics: Force, Motion & Newton's Law Explained!:    • Made Simple! GED Science Physics: For...   FAST GED Science Scientific Method Lesson to Pass GED Science Faster:    • FAST GED Science Scientific Method Le...   For more GED videos to help you pass faster, please subscribe: https://www.youtube.com/c/TestPrepCha...