Concept of the Heart

This study will focus on discussing different information related to the human heart along with its structure and function. In terms of biology, the human heart has been considered as an internal muscular organ of a body that helps to pump blood throughout the body to reach nutrients and other essential things to the various corners of the human body. The heart controls the circulatory movement of the blood within the body. Along with reaching the nutrients and other hormonal fluid to the cells, the heart helps in reaching the metabolic wastes to the respective organs as well. 

Definition of the human heart

In general terms, a human heart can be defined as a fist-sized internal muscular organ that pumps blood throughout the human body. In order to pump the blood, the human heart relies on the vessels attached to it for managing the circulatory motion of the blood flow within a human body. In the chest, the heart is composed of two chambers and is slight to the left of the center. The heart is surrounded by the pericardium, a double-walled sac that sits between two lungs. This muscular internal organ helps to deliver nutrient-rich blood along with oxygen to the tissues and organs and helps to carry out the waste from the organs. 

Main parts of the heart

In terms of biology, the human heart has four parts: two on bottom and two on top. 

• The top two chambers are called by the terms: right atrium and left atrium. These two chambers of the heart received the blood that is entering into the heart. A wall named intertribal septum has separated these two atria. 
• On the other hand, the chambers at the bottom of the heart, which are called the right ventricle and left ventricle. These two bottom chambers help to pump out the stored blood of the heart. The interventricular septum is a wall that helps to separate these two individual chambers of the human heart. 
• The tricuspid valve helps in separating the right atrium and right ventricle. The mitral valve helps to separate the left ventricle from the left atrium.

Diagram of the human heart

The diagram of a human heart consists of the four different chambers of the heart with walls that help to separate every chamber from each other. The outer wall of a human heart consists of three different layers. The outermost layer of the wall called the epicardium has formed the inner layer of the pericardium. The muscle that helps the contraction of the heart has been lying on the middle layer of the wall called the myocardium. Furthermore, the inner layer called the endocardium lines the heart chamber. The pulmonary semilunar valve and the left ventricle and aorta separate the right ventricle and pulmonary artery by the aortic valve.

Heart rate and valves of the heart

A healthy heart beats nearly 100,000 times in a day. The normal heart rate has been measured within the range of 60 to 100 times per minute. A normal and healthy heart of an adult pumps approximately 8 pints of blood throughout the body. The deoxygenated blood has been sent to the lungs by the circulatory motion of the blood pumping of the human blood. On the other hand, the person who has a larger body size has a faster pulse. The heart ensures the direction of blood flow through four blood vessels: The aortic valve, Mitral valve, pulmonary valve, Tricuspid valve. 

Way in which human heart works

Rhythmic heartbeats are generated by the contraction and relaxation of the atria and ventricles. 

• The deoxygenated blood has been received by the right side of the heart in order to send it to the lungs. By the superior and inferior vena cava, deoxygenated blood is pumped into the right atrium from the body
• The left sides of the blood receive the blood with oxygen from the lungs and circulate this to the different parts of the human body.  The newly oxygenated valve returns to the left atrium with the help of pulmonary veins.  After being full, the left ventricle contracts and pushes the blood throughout the body. 

Functionality of heart

The main function of the human heart is to beat in order to maintain the circulatory motion of the blood flow within the entire body. The heart beats in two separate manners including the diastole and systole. 

• The way ventricles relax and fill with blood is the contraction of the atria for emptying all the blood in the ventricle. This particular action is called diastole.
• The ventricles contract in order to reduce the blood to the atria by relaxing its walls. This particular motion of the human heart is called the systolic motion. 

Conclusion

In this current study, the discussion has involved the definition of the human blood on the basis of the term represented in biology. Along with this, the body of the study has been included in the discussion regarding the main parts of the human heart. The place of the human body where the heart has been situated has been discussed in this study along with mentioning the normal heart rate and the valves that help the heart to maintain the circulatory motion of the blood.