쉐도잉 연습: Circulatory System and Pathway of Blood Through the Heart - 영상으로 영어 말하기 배우기
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Did you have breakfast this morning?
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Did you ever wonder after you eat breakfast and your food is digested, how is that glucose getting transported around your body?
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Or as you take a breath in, how does that oxygen get transported around?
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Or when you exhale, how does that carbon dioxide get transferred out?
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Are these only questions I ponder during breakfast?
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Maybe.
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Your circulatory system is absolutely fascinating and highly involved in this.
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In this short intro video of the circulatory system, we will mention some basics about its functions and trace the pathway of how blood travels through your heart,
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but please know before we get started, there are gigantic textbooks on the circulatory system itself.
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So obviously this video is just an intro.
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We're going to first talk about blood, the medium of how we transport glucose and gases.
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As we mentioned in our Body Systems intro video from many years ago, there are some misconceptions.
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Human blood is red, and always red, although the shade of red can vary based on how much oxygen is in the blood.
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Veins and arteries are often drawn in diagrams as blue
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or red to show whether they have lower or higher concentrations of oxygen.
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But that's just how it is used in most diagrams.
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It doesn't mean the blood, or the veins, or the arteries are actually that color.
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Veins that you see under your skin may look blue or green, but that involves the way they appear under the skin, and the reason for this would make a great physics topic.
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But I digress.
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Human blood has a lot of functions.
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It maintains a certain pH, temperature, osmotic pressure.
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All of this is very important for homeostasis.
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It transports things like hormones, nutrients, and gases.
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And it's made up of different components.
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One component includes plasma, the liquid portion.
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Water, proteins, salts, lipids.
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You'll find them in this liquid portion of blood, known as plasma.
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Another component includes cellular components.
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This means red blood cells which do the transporting of gases, white blood cells which can fight infections,
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and platelets which are actually cellular fragments and they're involved with helping your blood clot.
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Very important when there is damage to the body.
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Red blood cells have an iron containing protein called hemoglobin and that is where the red coloring of blood comes from.
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So when we're talking about blood and we're just introing the circulatory system, we're going to focus on how this blood moves around in the human body.
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Human heart anatomy observes the heart divided into two distinct
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and separated partitions- a deoxygenated or low oxygen partition and an oxygenated partition.
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There are some human congenital heart conditions that can result in this oxygenated and deoxygenated blood mixing, however.
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More on that at the end.
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Capillaries carry blood away from the heart.
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Think A4 away.
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Arteries are typically oxygen rich, but there are exceptions.
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Veins generally carry blood to the heart.
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Veins typically are oxygen poor, but there are exceptions.
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Capillaries are small blood vessels
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and it is at the capillary level where oxygen is delivered to organs
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and tissues and where carbon dioxide will be picked up to travel back to the lungs.
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So looking at this heart, the right side, and that's the person's right, so for you it will look opposite,
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pumps deoxygenated blood, and the left side pumps oxygenated blood.
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We can also see four chambers, the right atrium and right ventricle, and the left atrium and the left ventricle.
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I like to remember that A comes before V in the alphabet, so that helps me remember that A's for atria are at the top of the heart, V for ventricles are at the bottom of the heart.
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The heart also contains valves, which we'll see when we get to tracing the pathway of blood.
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The valves are one-way structures that help separate the chambers and also prevent backflow of blood.
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Ready to take the adventure of a lifetime?
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An adventure tracing the pathway of blood through the heart?
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We're going to start with blood that is in a human toe.
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This blood is deoxygenated.
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It needs to get to the heart so
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that it can be pumped to the lungs to pick up oxygen and then be spread throughout the body.
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It's going to get there through the vena cava.
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Inferior vena cava to be specific as the superior vena cava is above the heart.
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The blood enters the right atrium.
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The right atrium contracts, pushing the blood through the tricuspid valve, into the right ventricle.
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The right ventricle contracts, pumping the blood through the pulmonary valve to the pulmonary artery.
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By the way, when you see the word pulmonary, it likely involves lungs.
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The pulmonary artery takes blood to the lungs.
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The lungs are where red blood cells in the blood will take on oxygen and release carbon dioxide.
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Now this blood is oxygenated.
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It needs to return to the heart so that the heart can pump it throughout the body.
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The oxygenated blood travels through a pulmonary vein to the left atrium.
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The left atrium contracts and the blood travels through the mitral valve, also known as the bicuspid valve, into the left ventricle.
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The left ventricle contracts and pumps the blood through the aortic valve and out a major artery known as the aorta.
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The aorta is a major artery that carries oxygenated blood throughout the body.
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Now I don't want to neglect the fact that the heart needs its own blood supply for delivery of oxygen and glucose.
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The heart can receive this blood supply through coronary arteries.
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Coronary arteries branch off the aorta and eventually deliver blood into capillaries.
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These capillaries deliver oxygen and glucose to the heart.
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veins will take the deoxygenated blood to the right atrium where the blood will eventually travel the pathway to become oxygenated.
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In fact, to quiz yourself, can you pause the video and trace the pathway of blood again starting with the right atrium?
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Okay, all together.
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Right atrium, tricuspid valve, right ventricle, pulmonary valve, pulmonary artery, lungs, back through the pulmonary vein,
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left atrium, mitral valve, left ventricle, aortic valve, aorta.
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Takes it to the body and then it will eventually return through the vena cava back to the right atrium again.
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Whew, it almost makes you want to turn it into a song.
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But we won't.
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The significance of the pathways, how they interact, the coordination of contraction, and many more elements are part of every beat of your heart.
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A human heart beats over 100,000 times per day, so it's significant that every beat is coordinated and blood is directed where it should go.
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The complexity of the cardiac cycle, which is the coordinated sequence of the heart's contractions and relaxations, isn't something this short video can go into.
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Hopefully a separate video on that soon.
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One last thing.
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There are many conditions in which the heart doesn't function correctly.
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Anatomically, some heart conditions change the pathway flow of blood.
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One example that we had mentioned before is an atrial septal defect.
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The septum is the muscular wall that separates the right and left side of the heart.
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So a septal defect could mean an opening and oxygen-rich blood could mix with oxygen-poor blood.
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Depending on the size, this can cause further problems such as an abnormal heartbeat, stroke, or potentially heart failure in severe cases.
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Some medications can help the symptoms, or surgery can be an option.
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There continues to be more advancements for treating cardiovascular conditions.
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If you have interest in the amazing field of cardiology, take a look at the suggested further reading links in the video details.
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Well, that's it for the Amoeba Sisters, and we remind you to stay curious.
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영어 회화 연습을 하거나 IELTS 스피킹 준비를 하고 있는 중급 이상 학습자에게 좋습니다. 순환계와 심장의 구조에 관한 내용을 영어로 이해하면서, 과학 용어와 논리적인 설명을 표현하는 능력을 기를 수 있습니다. 특히 쉐도잉(shadowing) 연습에 적합한데, 말의 흐름과 강조하는 부분을 따라하면서 자연스러운 발음과 리듬을 익힐 수 있습니다.
빼놓을 수 없는 단어와 표현
- Circulatory system: 순환계. "The circulatory system transports nutrients."처럼 사용합니다.
- Deoxygenated blood: 탈산소혈. "Veins carry deoxygenated blood back to the heart."
- Homeostasis: 항상성. "Blood helps maintain homeostasis in the body."
- Backflow: 역류. "Valves prevent backflow of blood."
- Ponder: 깊이 생각하다. "I often ponder how the body works."처럼 사용해보세요.
발음을 올바르게 하는 방법
이 비디오의 화자는 명확하면서도 자연스러운 미국식 발음을 사용합니다. 특히 단어 사이의 연결음에 주의하세요. 예를 들어 "pump ed"가 아니라 "pump't"처럼 발음되거나, "and it is"가 "an' it is"로 줄어듭니다. 쉐도잉 연습을 할 때는 이러한 부분을 꼼꼼히 따라하세요. 또한 "hemoglobin" (헤모글로빈)과 "capillaries" (모세혈관) 같은 긴 단어는 음절을 분리해서 발음하는 것이 중요합니다. shadowspeaks나 shadowing site에서 비슷한 주제의 영상과 함께 연습하면 더욱 효과적입니다. 꾸준히 연습하다 보면 IELTS 스피킹에서도 자신감 있게 말할 수 있을 거예요!
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| 문형 | 영상 속 표현 |
|---|---|
| 수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점 | is digested · are often drawn · is used |
| 관계절 who / which + 절 — 사람이나 사물에 대한 추가 정보 | cells which can · platelets which are · cycle, which is |
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.