Home / Organs / Structure and Function of Human Heart

Structure and Function of Human Heart

The cardiovascular system is composed of the heart and blood vessels, it is responsible for supply oxygen and nutrients by circulating blood throughout the body.

The structure of the human heart

The heart consists of three layers:

  1. Pericardium – is like a sheet that wraps out
  2. Myocardium – is the heart muscle, responsible for promoting blood through the body by contraction.
  3. Endocardium – it is a thin layer that covers the inside.

Within the heart are four chambers: two atria located at the top (right atrium and left atrium)

2 ventricles located at the bottom (left ventricle and right ventricle) there are also 4 valves – 2 atria ventricular valve, the tricuspid valve separates the right atrium from the right ventricle and the left atrium is separated from left ventricle by mitral valve. The other 2 are arterial ventricle, the right ventricle is separated from the pulmonary artery by pulmonary valve and aortic valve separates the left ventricle from the aorta.

How does the heart work?

Posterior Surface View

The heart is the muscle that pumps oxygen-rich blood and nutrients to the body’s tissues through the blood vessels.

The heart keeps the blood moving in the body unidirectional, it is a closed circuit, and nothing is lost. The atria receive blood returning to the heart, the ventricles pump blood out of the heart.

The arteries carry oxygenated blood from the heart to the body tissues. Nutrients in tissues extracted and returned through the veins. Veins carry blood back to the heart.

The heart’s electrical system controls the rate of the heartbeat.

The heart is the hardest working muscle in the human body. The heart beats about 115,000 times a day, with an average rate of 80 times per minute, i.e. about 42 million times a year. For a normal lifetime, the human heart will beat more than 3,000 million times – pumping an amount of blood about one million barrels. Even when at rest, the heart continuously works hard.

About MahaSheikh

Check Also

Various Functions of Human Liver

Various Functions of Human Liver

Your liver stores, filters, purifies and synthesizes, is a true multitasking organ, vital, with a …

7 comments

  1. Great information on health care issues.Need more projection.

  2. Y. Chor-Hansen

    Hi, would like to know:

    1. What causes heart failures?
    2 What are heart diseases?
    3. What are the treatments?

    • Thanks for your concern.These articles are available on website.You may read them. Enjoy reading

    • Dear Hansen the question you asked is of so bigger spectrum that i find myself in trouble to tell you every bit of detail. I’ll try to simplify as much as i can.
      Firstly, heart failure is a state in which heart is in a failing state to do its prime function – maintaining required blood circulation throughout the body. There are many reasons for that but most significant are Hypertension, Diabetes melitus, Inborn pathology in heart structure or any acute event resulting in compromise of heart structure or function. Treatment depends upon the insult that occurred for instance in a patient of chronic uncontrolled hypertension treatment modality will be directed to a long-term control of blood pressure and so forth.

  3. Hi my son has a heart failure and also missing heart parts with twisted veins

Leave a Reply

Your email address will not be published. Required fields are marked *