The Heart, a Vital Organ
The heart is an almost indefatigable muscular organ. It is located in the center of the thorax.
From the 14th day of fetal life, the heart begins its work. From then on, it is the central engine of bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood circulation throughout the body.
Anatomy of the Heart
The heart is made up of a fibrous structure, valves, and an electrical network
Inside the heart, there are 2 upper chambers called atriaThe atria are the two upper chambers of the heart. They act as reservoirs for blood that will fill the ventricles. and 2 lower, more muscular chambers, called ventricles. A wall between the chambers defines the existence of a right heart and a left heart, each with an atrium and a ventricle.
Large Blood Vessels Are Connected to the Heart
Large bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood vessels, arteries, and veins are connected to the heart and provide bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood circulation throughout the body.
The coronary arteries
The bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood network supplying the heart is made up of 2 coronary arteriesThe two coronary arteries, the right and the left, form the blood network that supplies the heart with oxygen and nutrients. They are located directly on the surface of the heart and branch into smaller vessels that, one on the right and the other on the left.
The right coronary arteryThe two coronary arteries, the right and the left, form the blood network that supplies the heart with oxygen and nutrients. They are located directly on the surface of the heart and branch into smaller vessels that feeds the lower part of the heart.
The left coronary arteryThe two coronary arteries, the right and the left, form the blood network that supplies the heart with oxygen and nutrients. They are located directly on the surface of the heart and branch into smaller vessels that divides into 2 branches: the anterior interventricular artery, which supplies the anterior surface of the heart, and the circumflex artery, which likewise supplies the posterior surface of the heart.
The Right Chambers
The right chambers, which define the right heart, receive the venous bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood that has collected the body’s waste products or carbon dioxide (CO2). They send this bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood to the lungs where it is cleansed of carbon dioxide and recharged with the oxygen the body needs. The CO2 is ultimately expelled from the body through exhalation.
The right atrium is located above the tricuspid valve, while the right ventricle is below it.
The Left Chambers
The left chambers, which define the left heart, receive blood from the lungs. This bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood, known as arterial, was cleansed of carbon dioxide (CO2) by the lungs and recharged with oxygen. Arterial blood is propelled throughout the body by the main artery, the aorta.
The left atrium is placed above the mitral valve and the left ventricle is found in the bottom left part of the heart, below the left atrium.
Veins are the vessels that carry bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood to the heart. The reverse circulation, from the heart to the whole body, is ensured by blood vessels called arteries.
The 4 Cardiac Valves
The function of the 4 cardiac valves is to ensure that blood flow is always going forward. There is no turning back. These valves separate the heart chambers, namely the atriaThe atria are the two upper chambers of the heart. They act as reservoirs for blood that will fill the ventricles. and ventricles, as well as the large vessels that go in and out of the heart.
The right atrium is separated from the right ventricle by the tricuspid valve. The pulmonary valve isolates the right ventricle from the pulmonary artery. The left atrium is distanced from the left ventricle by the mitral valve, while the aortic valveThe aortic valve is located between the left ventricule and the aorta. It is one of the four valves ot the heart. >> diverts the left ventricle from the aorta.
A Muscular Pump in Charge of Blood Circulation
The “used” bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood is full of CO2 and has a bluish tint; it reaches the heart through 2 large veins. BloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood from the upper body arrives by way of the superior vena cava. BloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood from the lower body comes from the inferior vena cava.
The bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood first fills the atrium, then the pressure of the liquid causes the tricuspid valve to open. BloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood can then rush into the right ventricle.
Next, the right ventricle contracts and expels bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood through the pulmonary valve. From here, the bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood flows first to the pulmonary artery, then to the lungs where it rids itself of CO2 and fills with oxygen. The CO2 is expelled from the body through exhalation.
The oxygenated bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood returns to the left atrium through the 4 pulmonary veins.
The mitral valve, for its part, opens under the pressure of oxygenated bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood, allowing it to enter the left ventricle.
The latter contracts and expels the bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood, first through the aortic valveThe aortic valve is located between the left ventricule and the aorta. It is one of the four valves ot the heart. >> to the aorta, then from there throughout the body to feed it. In this way, oxygen is delivered to the cells, and carbon dioxide is evacuated.
And the cardiac cycle starts again.
It takes a red blood cell 60 heartbeats to cover the entire pulmonary circuit and the rest of the body.
The Large and the Small Blood Circulation
It is said that the right heart looks after the small circulation and the left heart attends to the large one.
This differentiation is reflected in the very structure of the ventricles. The muscle of the right ventricle is thinner than that of the left ventricle, which is called upon to make a greater effort to circulate bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood throughout the body.
A Perfect Architecture for Its Function
The heart is a perfect device thanks to its ingeniously integrated anatomy.
Its electrical system determines that the contraction of the ventricles proceeds from bottom to top, where the valves controlling access to the lungs and aorta are located.
Moreover, the position of the right ventricle, right next to the anterior part of the left ventricle, facilitates its work, as it collapses onto the latter.
A Bear Is Trailing You Closely!
The heart is sensitive to the body’s needs.
For instance, if a ferocious beast targets you as prey, your muscles will need more oxygen.
No need to panic!
The heart is capable of quintupling (x 5) bloodBlood is composed of red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for transporting oxygen and carbon dioxide. White blood cells make up our immune defense system. Platelets contribute to blood flow in a matter of seconds. How is this achieved? By tripling the basic heart rate and doubling the force of contraction.
Don’t miss: Anatomy of the heart
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