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Nutrition Part 3 - Contenido educativo
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Hey everyone, and welcome back to part 3 of our 4-part video series on nutrition.
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Last time, we talked about the respiratory system and how oxygen and carbon dioxide travel
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through our bodies and get used by our muscles.
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Today, we're going to be connecting what we learned from the respiratory system to the
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circulatory system.
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So far, we've learned about how our respiratory system brings in oxygen and the end result
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of oxygen entering our bloodstream, but how exactly does the oxygen get to where it needs
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to go?
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That's where the circulatory system comes into play.
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The circulatory system takes the nutrients we eat and air we breathe and delivers all the essential nutrients to our organs, bones, brain, and muscles to help them keep working.
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Okay, I want everyone to try something.
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Take your pointer and middle finger and press them to the side of your neck just underneath your jaw and beside your windpipe.
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Can you feel your heartbeat?
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Move your fingers around and see if you can feel where it's strongest.
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Congratulations, you just checked your heart rate.
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The thumping under your fingers that you felt is your heartbeat.
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We talked earlier about how the lungs bring oxygen to our blood through the alveoli.
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The red blood cells absorb the oxygen from the lungs and get pumped back into the heart,
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and the heart then pumps it all over the body to keep it operational.
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But let's dive in and learn a little bit more about the circulatory system.
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The heart is an organ that acts like a pump.
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The heart is separated into two sides by the septum, which acts like a wall.
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Each side has two chambers, one above and one below.
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The chambers that are above are called the atria, and the two lower chambers are called ventricles.
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So essentially, the heart has four main rooms, the right atrium, the right ventricle, the left atrium, and the left ventricle.
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When the ventricles contract, they push the blood out of the heart.
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When you place your hand on your chest and feel a thump, that's your ventricle's heart at work.
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Blood is super important to the circulatory system.
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Blood contains liquid plasma and three types of cells.
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Red blood cells absorb oxygen from the lungs and transport it through the body.
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Platelets are the band-aids of the body and help stop bleeding whenever you get cut.
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Without platelets, we wouldn't get scabs, but we also wouldn't stop bleeding if we got hurt.
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White blood cells are the soldiers of the bloodstream because they fight germs and infections that enter the body.
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Whenever you get sick, the white blood cells come to the rescue and attack the infected cells in your body.
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Blood gets carried around by blood vessels, and these vessels come in three different types.
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arteries, veins, and capillaries. Arteries carry blood away from the heart. Veins carry blood back
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to the heart. And capillaries are super tiny blood vessels that connect the smallest arteries to the
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smallest veins. Capillaries also have very thin walls, so nutrients, gases, and waste products
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can go through them and into the cells of our bodies. So how does blood get pumped around our
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body? Well, first, deoxygenated blood enters through the right atrium and then into the right
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ventricle. The right ventricle pumps blood through the pulmonary artery to the lungs where it gets
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oxygen. From there, the blood drops off its carbon dioxide so it can carry its oxygen to the
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pulmonary veins of the heart. The oxygenated blood then goes into the left atrium and then the left
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ventricle. The left ventricle pumps the blood throughout the aorta, or the top of the heart,
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which channels it to the rest of the body. Once the blood drops off the oxygen and nutrients where
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needed, it picks up any carbon dioxide and waste products the muscles and tissues have excreted
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and carries it back to the superior and inferior vena cava.
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The superior and inferior vena cava are attached to the right side of the heart,
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which is where we began our journey.
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Wow, we made it full circle.
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Okay, so we connected a lot of dots today, so let's take a second to recap.
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We learned about how the body needs nutrients and oxygen to survive
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and how exactly the respiratory and circulatory system work together to do just that.
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We also learned how to check our pulse to feel our hearts hard at work.
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We then learned how blood takes oxygen and drops off carbon dioxide and carries it to the heart
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through the use of veins. Arteries then take blood away from the heart into the rest of the body,
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which get nutrients and oxygen from three different types of blood cells. After trading nutrients for
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carbon dioxide, the blood then comes back to the heart so it can be pumped into the lungs and start
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all over again. And to think, this all happens in a heartbeat. Well everyone, I think we covered it.
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Thank you for adventuring with me today as we connected the respiratory system to the circulatory
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system. I hope you learned a lot, and stay tuned for the last, but certainly not least,
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part four of this nutrition series.
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- Subido por:
- Cp santodomingo algete
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 67
- Fecha:
- 30 de noviembre de 2021 - 14:10
- Visibilidad:
- Público
- Centro:
- CP INF-PRI SANTO DOMINGO
- Duración:
- 04′ 49″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1280x720 píxeles
- Tamaño:
- 22.96 MBytes