Why does our Heart beat Faster when in Danger? | #aumsum

Why does our Heart beat Faster when in Danger? | #aumsum


It’s AumSum Time. Why does our heart beat faster when in danger? Because it’s getting ready to run away. No. In stressful or displeasing situations. When a part of the brain called amygdala. Receives unpleasant information from our senses. It generates a response of fear or danger
and sends it to hypothalamus. Now, hypothalamus has 2 options. Either to activate the sympathetic nervous
system. Which regulates the fight or flight response. Or activate the parasympathetic nervous system. Which is responsible for restfulness and digestion. Now, as the response was of danger. Fight or flight system gets activated which
in turn signals the release of adrenaline. Adrenaline increases breathing rate, elevates
our blood pressure and most importantly. It makes our heart beat faster than normal. This allows more oxygen and glucose to reach
our cells through blood. Giving us a burst of energy and thus, making
us capable to fight or flight. The Human Heart. Just look at this machine. You remember him, right?. Yes. It’s Wall E, the iconic robot who meets Eva
and falls in love with her. Have you ever been in love AumSum? Yes. I can see her now. 2 soft buns, Cheese, Tomato. Mmm My Burger. Oh AumSum. Anyways, which organ is associated with love? The heart, right? It’s kind of obvious. But the truth is our heart doesn’t teach us
to love. And most important, it doesn’t break apart
when somebody leaves us. Yeah. It’s True. Our heart, the cone-shaped organ is actually
a complete workaholic. Throughout our lifetime. It tirelessly pumps oxygen and nutrient-rich
blood to all our body parts. Just like a pumping machine. Common now, close your palm and form a fist. Don’t worry. I’m not asking you to fight. Our fist is approximately how big our heart
is. It is located between our lungs, slightly
tilted towards the left side. It is enclosed in a double-layered sac called
pericardium. Mmm. Does it taste like Peri Peri Fries? No AumSum. What does a picture frame do? It holds the picture in place, right? Without the frame, the picture would fall
off. Just like that. The pericardium protects the heart by anchoring
it to the surrounding tissue. So that the heart stays in place. Pericardium also prevents the heart from overfilling. Now, just like Captain America’s shield is
made of special alloy. Our heart is made of special muscle cells
called cardiac muscle fibers. Now, let’s dive in. Just like a tennis net divides the tennis
court into 2 parts. The heart is also divided onto the left and
the right side by a wall called cardiac septum. The right side of the heart is filled with
deoxygenated blood. While the left side is filled with oxygenated
blood. And this dividing wall prevents the blood
from mixing. Each side of heart further divides into two
chambers. The upper chambers are called atria. While the lower chambers are called ventricles. Where are the sleeping chambers? Stop it AumSum. Let’s first learn about atrium. Now, just like a postbox receives letters
from multiple people. The atrium receives blood from different parts
of the body. Thus, the atria are simply receiving chambers. They have thin muscular walls. Why Thin? Do they believe in size 0? Hahaha. No AumSum. Their walls are thin, not requiring a lot
of muscle tissue. Because they only have to pump blood into
the ventricles present right below them. Now, moving onto the ventricle. Just like the postman collects all the letters
from the postbox. And delivers them to their respective locations. Ventricle also collects blood from the atrium. And pumps it to different parts of the body. Thus, the ventricles are called discharging
chambers. Just like coconuts have thick outer covering. Ventricles have thick muscular walls. Why Thick? Because the walls need more muscle tissue
to generate enough pressure. So as to pump blood out of the heart and distribute
it to the entire body. Now, the left ventricle’s wall is even more
thicker than right ventricle’s wall. Because the right ventricle pumps blood only
to the lungs. While the left ventricle has to pump it to
the entire body. Requiring much more pressure than the right
ventricle. Now, let’s talk about the valves of the
heart. In total, we have 4 valves. Tricuspid Valve, Bicuspid Valve, Pulmonary Valve and Aortic Valve. What happens when you hop onto a flight? Can you just change your mind and ask the
pilot to turn back? Nope. Same with the 4 valves of the heart. They are fibrous flaps of tissue allowing
the blood to flow in one direction only. And then they close tightly, preventing the
backflow of blood. So, they basically act like security guards. The tricuspid valve guards the opening between
right atrium and right ventricle. While the bicuspid valve guards the opening
between left atrium and left ventricle. Together, they are called atrioventricular
valves. Pulmonary valve guards opening between the
right ventricle and the pulmonary artery. While aortic valve guards opening between left ventricle and aorta. Together, they are called semilunar valves. Atrioventricular, Semilunar. Sounds like the names of some star trek guys. Oh AumSum. So, that was all for the structure of the
heart. Now, let’s understand its working. But before that, let me ask you something. Why is the heart so important? Can’t we survive without it? Depends, Can you survive without oxygen? No right? Who is the guy making sure that every cell
of our body gets oxygen? The HEART. It pumps blood through the entire body. Supplying oxygen and nutrients to the cells. And removing carbon dioxide and waste materials
from them. This movement of blood through the entire
body is called circulation of blood. Let’s understand this movement. From the different body parts, deoxygenated
blood is collected and brought to the heart. It enters the right atrium through blood vessels
called superior and inferior vena cava. This deoxygenated blood now moves into the
right ventricle. Now, in order to purify the blood, it is sent
to the lungs via the pulmonary artery. In the lungs, the blood is purified. That is, carbon dioxide is removed and oxygen
is added to the blood. Now, this oxygenated blood needs to be sent
to all body parts. So, let’s take it back to the heart, through
the pulmonary veins into the left atrium. From there, it flows into the left ventricle. And now, finally, through the aorta, it leaves
the heart and is sent throughout the body. Thus, oxygenated blood is delivered to every
cell. This completes one cycle of blood circulation. Now, deoxygenated blood is again collected,
brought back to the heart and the cycle continues. Did you know that the blood circulation between
the heart. And lungs is called pulmonary circulation. While the circulation between the heart and
body parts is called systemic circulation. Since the blood flows twice through the heart
in one circuit. It is called double circulation. Well I am double awesome Because awesome flows
constantly through me every second. You’re unbelievable AumSum.

24 Replies to “Why does our Heart beat Faster when in Danger? | #aumsum”

  1. I don't even know what we still have traditional school systems in place. When I learnt this thing in Science class 18 years ago, I only remember some names like Aorta and pulmonary veins but this video makes everything very simple to understand

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