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The two types of circulatory systems are:

The two types of circulatory systems are:

Open circulatory system

Closed circulatory system

William Harvey, an English physician, was the first person to describe blood’s circulation in the body.

Veins are an important part of our circulatory system. Veins carry deoxygenated blood from the various parts of the body towards the heart.

Double circulation is a system of circulation where the blood flows through two different routes – one for oxygenated blood and the other for deoxygenated blood. This type of circulation is very effective as the body has a constant supply of oxygenated blood. The majority of mammals, including humans have a double circulatory system.

The human heart is divided into four chambers:

Left Atria.

Right Atria.

Left Ventricles.

Right Ventricles.

The largest vein in the human body is the inferior vena cava. It functions by carrying blood from the lower half of the body to the heart. The largest artery in the human body is the aorta. It functions by carrying blood away from the heart to different parts of the body.

The primary risk factors that cause heart failure include:



High cholesterol.

High blood pressure.

Intake of fat-rich food.

The humans have a closed type of circulatory system

There are three types of circulation:

Pulmonary Circulation

Systemic Circulation

Coronary Circulation

The following factors could be the major causes of high blood pressure in humans:

More intake of salty foods.

Regular intake of too much alcohol.

Intake of large amounts of fat-rich foods.

Blood vessels are classified as follows:




Blood is primarily broken down into the following components:





The circulatory system is the biological system that helps circulate blood throughout the body. The circulatory system is a vital organ system of all vertebrates, which is involved in the transportation of all the essential elements and components, required to be delivered to the various parts of the body. The circulatory system is commonly known as the cardiovascular system, as it is composed of the heart and other major organs. It is a network system that functions by delivering essential substances such as blood, oxygen and other nutrients to cells, tissues and other organs for basic functions to occur. Read more:   Anatomy of Circulatory System

The circulatory system is a vast network of organs and blood vessels that functions both by transporting the necessities (nutrients, oxygen and hormones) and removal of wastes (carbon dioxide, ammonia, urea and other nitrogenous wastes) from the different parts of the body. Not only does the circulatory system transport the necessities, but this system also keeps our cells and tissues healthy and alive.

The circulatory system consists of a vast network of organs, which functions by transporting the essential requirements throughout the body.The heart, blood vessels and the blood cells are considered the key organs in the circulatory system. The functioning of the circulatory system begins from the heart, which is found at the center of the human chest cavity and functions by pumping blood to different parts of the body. The heart is composed of four different chambers, left and right atriums, which make up the two chambers at the top and the left and right ventricles form the two chambers at the bottom.These chambers are separated by one-way valves.The circulatory system includes main blood vessels, which are responsible for circulating fresh oxygen and removing carbon dioxide. Blood is the transport media of the circulatory system, which functions by transporting all the essential requirements, including the respiratory gases, digested and absorbed nutrients, and other excretory products. The pulmonary and systemic systems are two independent networks that work together.There are three different types of circulation that occur regularly in the body:

The de-oxygen blood is carried by the veins to the right atrium of the heart, which is then pumped through the pulmonary artery and enters the lungs, where the exchange of carbon dioxide and oxygen takes place. The systemic system of arteries carries oxygen and nutrient rich blood from the heart to all parts of the body. Veins carry the de-oxygen blood back to the heart. The capillaries are the smallest type of blood vessels, which provide the bridge between the arteries and veins.

The circulatory system is composed of the heart, arteries, capillaries, veins, blood and the blood vessels. The  human circulatory system  transports oxygenated blood from the lungs to the heart, which is later pumped to different parts of the body via the arteries. The Heart The human heart is one of the most important organs of the circulatory system. It is mainly responsible for maintaining and existence of life. The human heart is about the size of two adult hands held together and is found between the lungs and near the centre of the chest. The  human heart  is divided into four chambers, namely two ventricles and two atria. The ventricles are the chambers that pump blood and atrium are the chambers that receive the blood. Among which, the right ventricle and atrium make up the “right portion of the heart”, and the left ventricle and atrium make up the “left portion of the heart.” The human heart functions continuously throughout the lifespan of an individual without any break. On average, a healthy heart pumps around almost 200 million litres of blood and roughly beats 2.5 billion times. Arteries Arteries are muscular-walled tubes responsible for transporting oxygenated blood away from the heart to all other parts of the body. Veins Veins carry deoxygenated blood to the lungs where they are oxygenated and carried to the heart for circulation. Also Refer:  Difference between Arteries and Veins Blood Blood is the only fluid connective tissue, which functions by transporting nutrients, oxygen, minerals, hormones, antibodies, and other essential things required to keep the body healthy. It is one of the most important components of life, which makes up 7 to 8 percent of our body weight. An average adult possesses around 5 to 6 litres of blood. There are many cellular structures in the composition of blood. A single drop of blood comprises:

A human body is mainly composed of cells, tissues, organs and organ system. All these require certain essential elements and components to carry on their metabolic activities to keep our body healthy, which are carried by the circulatory system. The circulatory system also helps in sustaining all the organ systems and acts as an interface for cell-to-cell interaction. Combined with the cardiovascular system, the circulatory system engulfs the invading pathogens, maintains the body temperature and also balances the homeostasis among the systems. Other importance of the circulatory system are: The Digestive system The circulatory system is involved in the transportation of digested and absorbed nutrients from the food molecules to every body cell. Respiratory system The circulatory system is involved in the transportation of the oxygen from the lungs to all parts of the body. Similarly, the carbon dioxide is collected from the different cells and tissues and transported to the lungs, where it is exhaled out into the environment through the nostrils. Excretory system Excess amounts of water, salts, nitrogenous wastes, urea and all other wastes produced by the cells, tissues and other organs during its metabolic process are carried to the  excretory system , which is thrown out of the body by respective excretory organs. Endocrine system The endocrine system includes the specialized glands, which are involved in the production of hormones for the regulation of metabolism, growth and development and other cellular function. The circulatory system is involved in transporting secreted hormones throughout the body or to the target sites.

The  disorders of the circulatory system  could be defined as any ailment which affects parts of the circulatory system, including the heart, blood cells, arteries, veins and the blood vessels. There are many factors responsible for the disorder of the circulatory system. The main factors are :

Listed below are the most common disorders of the human circulatory system. Heart diseases, including stroke, heart attack, hypertension, arteriosclerosis and aneurysm. Other disorders of the human circulatory system are:

  This article concludes the introduction to the circulatory system, their features, importance, functions and disorders of the human circulatory system.

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