How do the circulatory & respiratory systems function normally?
369465
Oxygen enters through the mouth and nose (nasopharynx) and moves down into the trachea and into the lungs. Oxygen and Carbon Dioxide are exchanged in the lungs at the Alveoli. Oxygen enters into the blood stream and Carbon Dioxide leaves the blood stream to be expelled by the exhalation of the lungs. The Oxygenated blood travels from the lungs to the heart, the heart then pumps the Oxygen rich blood into the arteries which take that blood away from the heart and circulate it through the rest of the body. Veins Then come back to the heart carrying oxygen-depleted blood where they are pumped through the heart to the lungs where they get more Oxygen and once again travel back to the heart to be pumped back to the rest of the body. That completes the circuit.
406302
a) When you inhale, air goes through your nostrils and into you air ways all the way to your lungs.\nb) Inside your lungs are small alveoli that capture O2 molecules and trap them for your red cells to start working.\nc) Each red cell is like a carrier that excahnges O2 molecules for CO2 moluecules (those of used air on your bloodstream)\nd) Red cells go through your blood to every tiny place in your body giving oxygen where is needed and taking CO2 back to the lungs.  Your lungs get rid off those CO2 molecules when you exhale.\ne) You heart pumps blood in two directions:  It makes the blood with carbon dioxide (CO2) go to the lungs and the blood that is oxygen rich, go to all your body.  Your brain is the primary oxygen client in your body.
79497
The basic functions of blood are: carry oxygen and nutrients to cells; remove waste from tissues; maintain body temperature by carrying heat to all parts; allow communication between organs (e.g. hormone and neurotransmitter transport)
766541
Circulatory - keeps the blood and nutrients circulating to all vital organs\nRespiratory - provides oxygen to the blood system, and eliminates CO2\nNeurological - controls the other systems\nDigestive - provides the nutrients circulated by the blood system, and excretes the waste products, ridding the body of toxins\nRenal - maintains healthy fluid balance so that the blood can flow through the body with ease, also eliminates waste products, ridding the body of toxins
136322
The cardiovascular system is a closed system, meaning that blood remains inside the vessels no matter how small they are.  The process of diffusion drives oxygen, carbon dioxide, wastes and nutrients between the tissues and the blood inside the blood vessels-blood just goes around the body.  Humans have a 4-chambered heart: 2 ventricles and 2 atria (sing: atrium).  The atria receive blood and the ventricles "expel" the blood (pumps the blood away from the heart).  You can partition the heart into two sides (left and right), each with its own ventricle and atrium.   One side is for the systemic circulation (to the body) and the other is for the pulmonary circulation (to the lungs).  Blood (deoxygenated) from the body collects in the right atrium, which passes the blood to the right ventricle, which relays the blood to the pulmonary arteries (arteries to the lungs) to get oxygen and expel carbon dioxide.  Once the blood in the lungs acquires oxygen, it passes to the pulmonary veins and into the left atrium.  Then, the blood goes into the left ventricle and is pumped into the aorta (think of it as the largest artery in the body or like in the water supply, the main tube of water where all of the other tubes originate). From the aorta it goes to the arteries and then to the arterioles and the capillary networks (where gas exchange occurs).  After being depleted of oxygen, it goes to the venules to the veins then to the vena cavae and back into the right atrium and it goes around again. :-)
965539
Arteries are muscular blood vessels that carry blood away from the heart. They are contrasted with veins, which carry blood toward the heart.\n\nThe circulatory system is extremely important in sustaining life. Its proper functioning is responsible for the delivery of oxygen and nutrients to all cells, as well as the removal of carbon dioxide and waste products, maintenance of optimum pH, and the mobility of the elements, proteins and cells of the immune system. In developed countries, the two leading causes of death, myocardial infarction and stroke each may directly result from an arterial system that has been slowly and progressively compromised by years of deterioration.
62299
That's spelled "respiratory" system, not "respitory" ;-)\n\nYou'll find an explanation of how your respiratory system works here:\n\nhttp://sln.fi.edu/biosci/systems/respiration.html\nor here: http://yucky.discovery.com/flash/body/pg000138.html\nor a slightly more technical explanation here: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/Pulmonary.html
303652
All right, I'm first going to explain, briefly, the structure of the cardiovascular system, and then I'll move on to how the blood transports oxygen specifically.\n\nYour heart pumps blood from the right ventricle to your lungs, where it exchanges carbon dioxide for oxygen, and then continues to your left atria. The left atria pumps the blood to the left ventricle, which pumps blood through your arteries  to your capillaries, where the oxygen is released so that cells can use it. Carbon dioxide is picked up, and the blood continues to the veins, and back to the right atria.\n\nNow, your blood contains red blood cells, which contain two important molecules, hemoglobin and myoglobin. Both have a high affinity for oxygen, so, in your lungs, where there is a high oxygen concentration, oxygen binds to each of these two molecules (until the equilibrium point is reached). The red blood cells are pumped throughout the body. \n\nIn the body, the concentration of oxygen is lower than in the surrounding atmosphere, so the amount of hemoglobin (and myoglobin) which is binding oxygen decreases until it reaches the new equilibrium point. Active tissues use oxygen quickly, forming lots of CO2, which enters the blood, and is converted to carbonic acid by red blood cells, using the enzyme carbonic anhydrase. The change in pH lowers the affinity of hemoglobin for oxygen, so more oxygen is released from other red blood cells near working tissues. The carbonic acid is released back into the blood from red blood cells, where it dissociates into a proton (H+) and a bicarbonate ion. It travels through the blood back to the lungs, where it is converted back into CO2, and diffuses across the transport surfaces of the lungs due to the concentration gradient. Then the cycle starts over.
1034043
there are many kinds of elements and compounds in human body such as blood circulation, repiratory system,muscular system and productive system etc. for an example the function of the blood circulation is to circulate the blood to the whole body . the blood have a pigmen called hemoglobyn to bring along oxygen to the cell in our body. every cell need an oxygen to live. \n\nfurthemore ,our body is contain by many things such as leucosyte , good bacteria , ions , platlet , enzym , hormon , water , uric acid , vitamins, etc. each of this element have their function.
937883
Our heart is a pump, a very efficient one. The whole body consists of various circuits. And there are valves which control the flow of blood. Since the heart pumps blood, that is, it sends the blood at a certain pressure, the flood flows to various body parts and back, whatever the body position is, horizontal or vertical. This applies to the lowest part of our bodies (foot) too, when we stand up.
1114610
The skin is one of the major organs. Cilia in the nose prevents inhalation, the normal bacteria in the body that live there, white blood cells in the bloodstream, eyelashes and tears in the eyes, etc, etc. Our bodies come with self-healing structures unless they are pushed beyond their limits and can no longer function properly.
34609
If you think the brain and the heart work together then all organs work together with the Brain.  Asthma is a respiratory disease where the bronchioles shrink and close off restricting the amount of air getting into the air sacs.  If you have a serious attack you will lose consciousness because of the lack of oxygen to your brain, but most medication can prevent this from happening.
608209
Respiration removes carbon dioxide which, when in the body, forms carbonic acid in the blood. Too much carbonic acid and you will suffer from acidosis. In addition to keeping the blood at the correct pH, respiration supplies oxygen to the blood and tissues, such as muscle so that they too, can function correctly.\nSo, homeostasis is when all systems and fluids and tissues are "balanced", or in their correct working state. By removing carbon dioxide, respiration helps to keep the blood (and the body) in homeostasis.
5034
Oxygen (as O2) enters the lungs and diffuses through the thin layer of epithelial cells into the blood stream, where it binds one of four sites on hemoglobin.  The hemoglobin carries the oxygen to the heart, where it is then pumped out to the tissues of the body.  Tissues uptake oxgen as needed, and give CO2 in return to the blood stream.  The CO2 is then carried back to the lungs, where more oxygen is taken up.\n\nOxygen serves as an oxidizer, while fuels (such as sugar and fats) serve as reducers.  The oxygen acts in what are called "Oxidation/reduction" reactions (aka Redox--defined by a transfer of electrons) which release an excess of energy.  That energy is used to make ATP (adenosine triphosphate), which acts as the energy carrying molecule of choice by the body.  The systems used to make ATP are primarily glycolysis and the electron transport chain.
546613
The heart is what pumps blood and is the centerpiece of the circulatory system. Without it the blood could not carry the nutrients the body needs. The lungs take in oxygen to help feed the bloodstream. Basically both organs do the same job, just in different ways and for the same end. Keeping YOUR blood infused with the nutrients the body requires to sustain itself. Hope this helps.
907527
It circulates through your arteries and veins and capillaries and goes through your heart. The system is called the circulatory system.
225885
The respiratory system is how you breath in and out. In fact, any organism that participates in gas exchange has a respiratory system. In humans and other mammals, the respiratory system consists of the airways, the lungs, and the respiratory muscles that mediate the movement of air into and out of the body.