what is the main function of the human circulatory system?

Answer 1

To supply oxygen and nutrients to the body on the way out of the heart, and to remove toxins and waste materials on the way back towards the heart.

-dh

Answer 2

Hi there, in a nutshell (basically) the role of the circulatory system is to deliver blood ALL around the body. Blood is a nessecity in humans as it carries the soluble food that we eat to the cells of the body. The cells inside the body need food in order to produce energy in bonds of ATP. ATP is just the chemical term to describe a 'packet of energy', if I may. ATP stands for adino-tri-phosphate. If you haven't reached this level then I wouldn't suggest you worry too much about that. Also, the red blood cells carry oxygen to the cells. They do it like this: When the blood reaches the lungs, the capillaries pick up the oxygen that we inhale and diffusion occurs causing the oxygen atoms to 'seep' into the blood through the capillaries. Then the RED BLOOD CELLS have millions of units of 'haemoglobin', which stores the oxygen. It is the red blood cells that carry oxygen. So the circulatory system is in charge of delivering the blood which carries oxygen as well as food to the cells all around the body. But this is just a brief analysis of the functions of the circulatory system, It also has other functions as well such as delivering other substances through the blood to reach cells of the body. So what is the main function of the circulatory system? The main function of the circulatory system is to deliver blood, that is pumped from the heart, to all the cells in the body...ALL

Answer 3

The circulatory system's purpose is to deliver oxygen to all of the body organs and parts and also to receive carbon dioxide as the by-product of the cellular respiration. When cells respire they release carbon dioxide to the outside of the cell and after the red blood cells delivered oxygen, they will now carry carbondioxide and send it to the lungs and to the nose and finally outside of the body. PS this process finishes within two seconds

Answer 4

The circulatory system (scientifically known as the cardiovascular system) is an organ system that moves substances to and from cells; it can also help stabilize body temperature and pH (part of homeostasis). There are three types of circulatory systems (from simplest to most complex): no circulatory system, open circulatory system, and closed circulatory systemOpen circulatory system
An open system is an arrangement of internal transport present in some invertebrates like simple molluscs and arthropods in which circulatory fluid in a cavity called the hemocoel (also spelled haemocoel) bathes the organs directly and there is no distinction between blood and interstitial fluid; this combined fluid is called hemolymph (also spelled haemolymph). Muscular movements by the animal during locomotion can facilitate hemolymph movement, but diverting flow from one area to another is limited. When the heart relaxes, blood is drawn back toward the heart through open-ended pores.

Hemolymph fills all of the interior hemocoel of the body and surrounds all cells.

Hemolymph is composed of water, inorganic salts (mostly Na+, Cl-, K+, Mg2+, and Ca2+), and organic compounds (mostly carbohydrates, proteins, and lipids). The primary oxygen transporter molecule is hemocyanin.

There are free-floating cells, the hemocytes, within the hemolymph. They play a role in the arthropod immune system.


[edit] Closed circulatory system
The main components of the circulatory system are the heart, the blood, and the blood vessels.

The circulatory systems of all vertebrates, as well as of annelids (for example, earthworms) and cephalopods (squid and octopus) are closed, meaning that the blood never leaves the system of blood vessels consisting of arteries, capillaries and veins.

Arteries bring oxygenated blood to the tissues (except pulmonary arteries), and veins bring deoxygenated blood back to the heart (except pulmonary veins). Blood passes from arteries to veins through capillaries, which are the thinnest and most numerous of the blood vessels.

The systems of fish, amphibians, reptiles, and birds show various stages of the evolution of the circulatory system.

In fish, the system has only one circuit, with the blood being pumped through the capillaries of the gills and on to the capillaries of the body tissues. This is known as single circulation. The heart of fish is therefore only a single pump (consisting of two chambers).

In amphibians and most reptiles, a double circulatory system is used, but the heart is not always completely separated into two pumps. Amphibians have a three-chambered heart.

Birds and mammals 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 evolved independently of that of mammals.


[edit] Mammalian circulation
Poorly oxygenated blood collects in two major veins: the superior vena cava and the inferior vena cava. The superior and inferior vena cava empty into the right atrium of the heart. The coronary sinus which brings blood back from the heart itself also empties into the right atrium. The right atrium is the larger of the two atria, although both receive the same amount of blood. The blood is then pumped through the tricuspid valve, or right atrioventricular valve, into the right ventricle. From the right ventricle, blood is pumped through the pulmonary semi-lunar valve into the pulmonary artery. This blood leaves the heart by the pulmonary arteries and travels through the lungs, where it is oxygenated, and into the pulmonary veins. The oxygenated blood then enters the left atrium. From the left atrium, the blood then travels through the bicuspid valve, also called the mitral or left atrioventricular valve, into the left ventricle. The left ventricle is thicker and more muscular than the right ventricle because it pumps blood at a higher pressure. Also, the right ventricle cannot be too powerful or it would cause pulmonary hypertension in the lungs. From the left ventricle, blood is pumped through the aortic semi-lunar valve into the aorta. Once the blood goes through systemic circulation, peripheral tissues will extract oxygen from it, and it will again be collected inside the vena cava and the process will continue. Peripheral tissues do not fully deoxygenate the blood, so venous blood does have oxygen, but in a lower concentration than in arterial blood.

The release of oxygen from erythrocytes is regulated. It increases with an increase of carbon dioxide in tissues, an increase in temperature, or a decrease in pH. Such characteristics are exhibited by tissues undergoing high metabolism, as they require increased levels of oxygen.

Answer 5

The circulatory System is A MULTIFACETED System.

Without Oxygen taken and CO removed we DIE!

Without TEMPERATURE REGULATION we DIE!

Without PH Control of our Endemic Systems, we DIE!

Without Waste Products Removal we DIE!

And On and On and On....!

Thanks, RR

Answer 6

To transport nutrients and oxygen to all parts of the body, and carry waste materials to the organs that can purge them from the body.

Answer 7

Pumps blood (carrying oxygen) around the body.

Answer 8

the brain needs oxygen and the circulatory system keeps the brain supplied with oxygen..

Answer 9

To provide oxygen rich blood to your body and brain and to eleminate impurities and toxins from your vital organs.

Answer 10

To transport oxygen , nutrients etc to all living cells and to remove all waste products, carbon dioxide etc