HEART | BLOOD CIRCULATION | TYPES OF BLOOD CIRCULATION | HEART BEAT-deepsknowledges

 Heart

 Heart main part of the blood circulation system. It is roughly conical in shape and located in the middle of the chest cavity. It is made up of thick cardiac muscles.  it is covered by a double-walled membranous sac called pericardium.  In this sac,  there is a liquid called pericardial fluid which protects the heart from shock. The human heart consists of four Chambers. The Upper to Chambers are auricles and lower two chambers are called ventricles. The Heart is divided into left and right part by spectrum.

Two large veins called superior vena cava and inferior Vena cava opens to right auricle. A valve named tricuspid valve is present between the right auricle and right ventricle. It lets the blood flow from the right auricle to right ventricle but not in the opposite direction.

Pulmonary artery originated from the right ventricle and growth towards the lungs. The pulmonic valve is present between the Pulmonary artery and right ventricle.  The left auricle is connected with four pulmonary veins which carry blood from the lungs to the heart. Left auricle open to the left ventricle through a bicuspid valve. A  large blood vessel named aorta originated from the left ventricle. it carries blood from the heart to various part of the body. The aortic valve is present between the aorta and left ventricle.

Blood circulation

 Deoxygenated blood is collected from the upper part of the body by superior Vena cava and from the lower part of the body by inferior Vena cava to right auricles. From the right auricle, blood flow to the right ventricle through the tricuspid valve. The right ventricle pumps the blood to the lungs through the pulmonary artery. The pulmonary artery divide into your left and right pulmonary arteries. The left pulmonary artery carries blood to the left lungs and right actress carries blood to the right lungs. In the lungs, the blood is purified by taking Oxygen and throwing Carbon dioxide.

 The oxygenated blood is carried from each lung to left auricle by two pulmonary veins. The oxygenated blood passes from the left auricle to left ventricle through the bicuspid or mitral valve. From the left ventricle, blood is carried by an aorta to the various parts.

The aorta divides into small arteries then to the arterioles.  The arterioles further divide into capillaries inside the organ. The capillaries supply oxygen to the organ.  Capillaries also collect carbon dioxide and supply to the veins. Veins combined together to form vena cava. From the venacava blood come to the right auricle. In the same way, blood circulation continues.

 Types of Blood circulation 

 In human beings,   the blood circulates into ways: they are
1.  pulmonary circulation
2. systematic circulation

    Pulmonary circulation

 The circulation of blood between the heart and lungs is called pulmonary circulation. In the circulation, the right ventricle pumps deoxygenated blood to the lungs through pulmonary arteries. the blood is oxygenated in the lungs. The oxygenated blood is carried to the left auricle through pulmonary veins.

  Systematic circulation

 Circulation of blood between the hearts and different organ except lungs called systematic circulation. In this process, When left ventricle contract, the purified blood is pumped to different parts of the body through the aorta. The aorta divides into two branches is called arteries. To the artery supply the oxygenated blood to different parts. The cell and tissue of the body parts absorb the essential nutrients and oxygen. Then, the blood returns to the right auricle through inferior and superior Vena cava.

 

Heartbeat

 The contraction and relaxation of heart muscles cause the pumping of the blood. The continuous rhythmic beat produces due to contraction and relaxation of blood muscles is called heartbeat. The Heartbeat per minute is called Heartbeat rate. The heartbeat rate of a healthy person is 60 to 100 times for a minute.  The heartbeat rate differs according to the age, sex, and nature of work of a person.  A child has a faster heartbeat whereas and the old man has a lower heartbeat rate.  The heartbeat rate increases when a person is in tension, in fever, or does exercise, or get excited.