The processes of the human circulatory system

Before cutting out the figures on this page, Vesalius suggests that readers glue the page onto parchment and gives instructions on how to assemble the pieces and paste the multilayered figure onto a base "muscle man" illustration. These vessels are also called the lymphatic channels or simply lymphatics.

The following phase is called ejection period, which is when both ventricles pump the blood into the large arteries. A lymph follicle is a dense collection of lymphocytes, the number, size and configuration of which The processes of the human circulatory system in accordance with the functional state of the lymph node.

Circulatory system

Oxygen enters the bloodstream through tiny membranes in the lungs that absorb oxygen as it is inhaled. It transports hormones, nutrients, oxygen, antibodies, and other important things needed to keep the body healthy. The blood travels from the main artery to larger and smaller arteries into the capillary network.

The system of blood vessels resembles a tree: Image of veins from William Harvey 's Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus, Finally, William Harveya pupil of Hieronymus Fabricius who had earlier described the valves of the veins without recognizing their functionperformed a sequence of experiments, and published Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus inwhich "demonstrated that there had to be a direct connection between the venous and arterial systems throughout the body, and not just the lungs.

The thick septum of the heart is not perforated and does not have visible pores as some people thought or invisible pores as Galen thought. Birds, mammals, and crocodilians show complete separation of the heart into two pumps, for a total of four heart chambers; it is thought that the four-chambered heart of birds and crocodilians evolved independently from that of mammals.

Although this concept of the circulatory system is only partially correct, it represents one of the earliest accounts of scientific thought. Consequently, every cell is able to obtain nutrients, water and oxygen without the need of a transport system.

Circulatory system

Hemolymph The open circulatory system of the grasshopper — made up of a heart, vessels and hemolymph. Flatworms, such as this Pseudoceros bifurcuslack specialized circulatory organs Closed circulatory system Two-chambered heart of a fish The circulatory systems of all vertebratesas well as of annelids for example, earthworms and cephalopods squidsoctopuses and relatives are closed, just as in humans.

March Other animals While humans, as well as other vertebrateshave a closed cardiovascular system meaning that the blood never leaves the network of arteriesveins and capillariessome invertebrate groups have an open cardiovascular system.

The heart did not pump blood around, the heart's motion sucked blood in during diastole and the blood moved by the pulsation of the arteries themselves.

Lymphatic system

Other organs are numbered and arranged around it. There are three different types of circulation that occur regularly in the body: This is the part that carries oxygenated blood away from the heart and to other parts of the body.

Hemolymph is composed of waterinorganic salts mostly sodiumchlorinepotassiummagnesiumand calciumand organic compounds mostly carbohydratesproteinsand lipids.

The primary oxygen transporter molecule is hemocyanin. How does the blood circulatory system work? In the systemic circulationthe left ventricle pumps oxygen -rich blood into the main artery aorta. From the heart, the air travelled to every member through the arteries.

Veins carry deoxygenated blood to the lungs where they receive oxygen. Thus he apparently postulated capillaries but with reversed flow of blood.

It consists of the heart and the blood vessels running through the entire body. Still, the systems of fishamphibiansreptilesand birds show various stages of the evolution of the circulatory system.

There is not only one blood circulatory system in the human body, but two, which are connected: Our information is based on the results of good-quality studies. In the systemic circulation, the left ventricle pumps oxygen-rich blood into the main artery aorta.

Blood is the transport media of nearly everything within the body.


Lymphadenopathy Lymphadenopathy refers to one or more enlarged lymph nodes. While most other nutrients absorbed by the small intestine are passed on to the portal venous system to drain via the portal vein into the liver for processing, fats lipids are passed on to the lymphatic system to be transported to the blood circulation via the thoracic duct.


The suitability of any of the described options in an individual case can be determined by talking to a doctor. Lymphoid tissue can either be structurally well organized as lymph nodes or may consist of loosely organized lymphoid follicles known as the mucosa-associated lymphoid tissue.The circulatory system consists of four major components: The Heart: About the size of two adult hands held together, the heart rests near the center of the to consistent pumping, the.

Transcript of Circulatory System Processes. The Lungs Step One All the blood enters the right side of the heart, where the superior vena cava and the inferior vena cava is. The superior vena cava collects all the blood from the top part of the body. The inferior vena cava collects it all from the bottom part.

In this lesson we explore the circulatory system, the all-important physiological process that allows each part of the body to get the water, oxygen, and nutrients it needs to survive.

Aug 01,  · The blood circulatory system (cardiovascular system) delivers nutrients and oxygen to all cells in the body. It consists of the heart and the blood vessels running through the entire body. The arteries carry blood away from the heart; the veins carry it back to the heart.

In this lesson we explore the circulatory system, the all-important physiological process that allows each part of the body to get the water, oxygen, and nutrients it needs to survive. In human beings and vertebrates, the lymphatic system acts as a subsystem of the circulatory system.

It also has a role to play in the transportation in human beings. .

The processes of the human circulatory system
Rated 0/5 based on 55 review