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	Circulatory system - Wikipedia, the free encyclopedia
		The circulatory systems of all vertebrates, as well as of annelids (for example, earthworms) and cephalopods (squids and octopuses) are closed, meaning that the blood never leaves the system of blood vessels consisting of arteries, capillaries and veins.
		The human circulatory system is comprised of the blood, the vascular system, and the heart.
		The circulatory system of the fetus is different, as the fetus does not use its lungs yet and obtains oxygen and nutrients from the placenta through the umbilical cord.
	en.wikipedia.org /wiki/Circulatory_system (1302 words)

	System - Open Encyclopedia (Site not responding. Last check: 2007-10-15)
		A system typically consists of components (or elements) which are connected together in order to facilitate the flow of information, matter or energy.
		Depending on the type of system, a system can often be distinguished from individual machines, elements or processes of that system by the number, arrangements and complexity of those elements.
		In the human body, we refer to such systems as the nervous system, the circulatory system, the digestive system, the reproductive system, and the respiratory system.
	open-encyclopedia.com /System (1078 words)

	Circulatory System [Definition] (Site not responding. Last check: 2007-10-15)
		The circulatory system or cardiovascular system is the organ system which circulates bloodBlood is a circulating tissue composed of fluid plasma and cells (red blood cells, white blood cells, platelets).
		The human circulatory system is comprised of the bloodBlood is a circulating tissue composed of fluid plasma and cells (red blood cells, white blood cells, platelets).
		After birth, the fetal circulatory system undergoes several anatomical changes, including closure of the ductus arteriosusIn the developing fetus, the ductus arteriosus (DA) is a shunt connecting the pulmonary artery to the aortic arch that allows much of the blood from the right ventricle to bypass the fetus' fluid-filled lungs.
	www.wikimirror.com /Circulatory_system (4122 words)

	Fetus - Wikipedia, the free encyclopedia
		The circulatory system of a human fetus works differently from that of born humans, mainly because the lungs are not in use: the fetus obtains oxygen and nutrients from the mother through the placenta and the umbilical cord.
		In the fetus, there is an opening between the right and left atrium (the foramen ovale), and most of the blood flows from the right into the left atrium, then into the left ventricle from where it is pumped through the aorta into the body.
		Infants with certain congenital anomalies of the heart can survive only as long as the ductus remains open: in such cases the closure of the ductus can be delayed by the administration of prostaglandins to permit sufficient time for the surgical correction of the anomalies.
	en.wikipedia.org /wiki/Fetus (1029 words)

	CIRCULATORY SYSTEMS
		Open circulatory systems (evolved in insects, mollusks and other invertebrates) pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells.
		Systemic pressure is sensed by receptors in the arteries and atria.
		Circulatory systems of several vertebrates showing the progressive evolution of the four-chambered heart and pulmonary and systemic circulatory circuits.
	www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookcircSYS.html (2943 words)

	Re: Which types of animals do not have hearts? I can't quite remember.
		Though the circulatory system begins with simple diffusion and the gastrovascular cavity and seems to end with the four chambered mammalian heart, the development of different hearts in organisms is actually convergent evolution, the frog, worm, and human heart all developed separately and independently of each other.
		Open and closed circulatory systems then serve organisms whether vessels are needed to transport materials (closed) or merely circulation through the whole body.
		Because overall circulatory system is closed, in each full passage through the system, the same volume of blood has to move through the circulation path as through the much more extensive body circulation path.
	www.madsci.org /posts/archives/dec2000/976392399.Zo.r.html (1326 words)

	Main Frame in AnPhystemplate
		An open circulatory system is a system in which the heart pumps blood into the hemocoel which is positioned in between the ectoderm and endoderm.
		Since the lymphatic system is included as part of the circulatory system because of its circulation of excess fluid and large molecules, it decreases the pressure in tissues that extra fluid increases.
		The lymphatic system is a system of vessels that returns excess fluid and proteins to the blood and transports large molecules to the blood.
	academics.smcvt.edu /dfacey/animalphysiology/circulation/answers.htm (5688 words)

	The circulatory system (from mollusk) -- Encyclopædia Britannica (Site not responding. Last check: 2007-10-15)
		The trigonal system is sometimes considered to be a subdivision of the hexagonal system.
		The cardiovascular, or circulatory, system in humans is composed of the heart and the blood vessels—arteries, veins, and capillaries.
		The major parts of the system are the lymph nodes, tonsils, thymus, spleen, and lymphatic vessels; additional lymphatic tissue is found in isolated patches in the gastrointestinal tract, lungs, and bone marrow.
	www.britannica.com /eb/article?tocId=35787 (851 words)

	Closed and Open Circulatory System (Site not responding. Last check: 2007-10-15)
		Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness.
		The open circulatory system is common to molluscs and arthropods.
		Open circulatory systems (evolved in crustaceans, insects, mollusks and other invertebrates) pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells.
	www.gsu.edu /~bioasx/closeopen.html (102 words)

	Circulatory System (Site not responding. Last check: 2007-10-15)
		The circulatory system is responsible for movement of nutrients, salts, hormones, and metabolic wastes throughout the insect's body.
		A dorsal vessel is the major structural component of an insect's circulatory system.
		During each diastolic phase (relaxation), the ostia open to allow inflow of hemolymph from the body cavity.
	www.cals.ncsu.edu:8050 /course/ent425/tutorial/circulatory.html (763 words)

	The Heart and the Circulatory System
		Circulatory system: the system of the body responsible for internal transport.
		Closed circulatory system: a type of circulatory system where the blood is contained within a system of vessels and the heart.
		Open circulatory system: a type of circulatory system where the blood is not contained within a system of vessels and the heart.
	www.accessexcellence.org /AE/AEC/CC/heart_glossary.html (420 words)

	Circulatory System for Biochemistry @ La Canada High School
		The gill breathing crustacean uses its circulatory system to transport oxygen and carbon dioxide, and accordingly the system is more complex than in the insect where it does not have a respiratory function.
		The human circulatory system consists of the four chambered heart, arteries, capillaries and veins.
		The lymphatic system maintains fluid and ion balances, transports lipids, and cooperattes with the immune system.
	www.lcusd.net /lchs/mewoldsen/circulation.htm (1362 words)

	Circulatory System (Site not responding. Last check: 2007-10-15)
		The heart, the lungs, and the blood vessels work together to form the circle part of the circulatory system.
		The body's circulatory system really has three distinct parts: pulmonary circulation, coronary circulation, and systemic circulation.
		Or, the lungs (pulmonary), the heart (coronary), and the rest of the system (systemic).
	sln.fi.edu /biosci/systems/circulation.html (94 words)

	"Open" Circulatory Systems (Site not responding. Last check: 2007-10-15)
		The volume of blood needed for such a system is kept to a minimum by a reduction in the size of the body cavity.
		This "open" system might appear to be inefficient compared to closed circulatory systems like ours [Link], but the two have very different demands being placed on them.
		In vertebrates, the circulatory system is responsible for transporting oxygen to all the tissues and removing carbon dioxide from them.
	users.rcn.com /jkimball.ma.ultranet/BiologyPages/G/GrasshopperHearts.html (255 words)

	The Heart and the Circulatory System
		Without the understanding of the circulatory system made possible by Harvey's pioneering work, the medical miracles that we think are commonplace would be impossible.
		The closed circulatory system of some mollusks and all higher invertebrates and the vertebrates is a much more efficient system.
		One of the simplest types of closed circulatory systems is found in annelids such as the earthworm.
	www.accessexcellence.org /AE/AEC/CC/heart_background.html (2457 words)

	Circulatory System (Site not responding. Last check: 2007-10-15)
		The circulatory system is good for a many number of reasons.
		Think of the human body as a city or town, the circulatory system are it's cars and buses, without them nobody can get to their work.
		For example, if a person gets cut and the flesh open, the circulatory system pumps more blood in hope that the white blood cells will come quicker and destroy the bacteria that comes in.
	www.stormpages.com /i/immunesystem/white.htm (79 words)

	Circulatory System (Site not responding. Last check: 2007-10-15)
		The Circulatory System is composed of the heart, blood, and blood vessels.
		Each is important to the proper functioning of the circulatory system.
		Circulatory System - Water vascular system is made up of interconnected internal canals branching from a ring canal that encircles the gut and thousands of tiny hollow tube feet.
	www.mrwatkins.com /bionotes/circulatorysystem.html (1144 words)

	GLOSSARYC
		cardiovascular system The human circulatory system consisting of the heart and the vessels that transport blood to and from the heart.
		circulatory system, closed A system that uses a continuous series of vessels of different sizes to deliver blood to body cells and return it to the heart; found in echinoderms and
		circulatory system, open A system in which the circulating fluid is not enclosed in vessels at all times; found in insects, crayfish, some mollusks, and other invertebrates.
	www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookglossC.html (2109 words)

	Drosophila
		Drosophila is part of the phylum Arthropoda, a phylum of segmented animals with paired, jointed appendages and a hard exoskeleton made of chitin.
		They have an open circulatory system with a dorsal heart, hemocoel occupies most of the body cavity, and coelom is reduced.
		IP is thought to bind to IP receptors in the subrhabdomeric cisternae, an extension of the endoplasmic reticulum, and cause release of calcium, but this process doesn't seem to be essential for normal vision.
	www.sciencedaily.com /encyclopedia/drosophila (1821 words)

	Circulatory System Worksheet
		The role of the circulatory system is to insure the transport of nutrients to the tissues and wates away from the tissues of a multicellular organism.
		Organisms that are composed of only a few layers of cells will not have a circulatory system because diffusion from and to their environment is sufficient.
		Different views of this system can be seen by comparing the EKG output between two or more of the sensors placed on the body.
	www.pleasanton.k12.ca.us /avhsweb/thiel/apbio/review/blood.html (1143 words)

	The Hutchinson Dictionary of Science: circulatory system@ HighBeam Research (Site not responding. Last check: 2007-10-15)
		System of vessels in an animal's body that transports essential substances (blood or other circulatory fluid) to and from the different parts of the body.
		All mammals except for the simplest kinds - such as sponges, jellyfish, sea anemones, and corals - have some type of circulatory system.
		Some invertebrates (animals without a backbone), such as insects, spiders, and most shellfish, have an 'open' circulatory system which consists of a simple network...
	www.highbeam.com /library/doc0.asp?DOCID=1P1:28919878&refid=ip_encyclopedia_hf (175 words)

	[No title] (Site not responding. Last check: 2007-10-15)
		Multicellular organisms that do not possess a circulatory system have a sac body plan, and thus a circulatory system is unnecessary.
		Molluscs and arthropods are two examples of invertebrates that have an open circulatory system.
		An open circulatory system consists of a heart, which acts much like a human heart to pump materials to various parts of the body.
	www.br.cc.va.us /biology/lab/circulation/background.htm (1204 words)

	[No title] (Site not responding. Last check: 2007-10-15)
		Describe the voyage of a single blood cell through the vertebrate circulatory system.
		Describe the conducting portion of the respiratory system (i.e., from the nose/mouth to the bronchial tree).
		Explain what a second messenger system (also known as a signal transduction system) is, and how it works.
	courses.washington.edu /bio161/Tolga/Studyquestionsexam4.doc (1414 words)

	Circulatory System - AskTheBrain.com
		The circulatory system transports oxygen from the lungs and nutrients from the digestive tract to every cell in the body, allowing for the continuation of cell metabolism.
		Blood is channeled through the cardiovascular system, oxygen is channeled through the circulatory system, lymphatic fluids are channeled through the lymphatic system, brain chemicals are channeled through the neurological system and so on.
		They studied the digestive and circulatory systems of the human body and designed an experiment to test the effect of exercise on pulse rates and breathing rates.
	www.askthebrain.com /circulatory_system-.html (409 words)

	star fish circulatory system (Site not responding. Last check: 2007-10-15)
		Circulatory System of Fish In the diagrams that follow, arrows represent the direction of...
		...system is only one of perhaps a hundred billion star systems that make...
		Circulatory System View in rows View as a grid Sort by: Store name Store rating Price Featured Product GNC F...
	system.deal247.info /star-fish-circulatory-system (441 words)

	biol 1116 chapt 23 notes (Site not responding. Last check: 2007-10-15)
		Vertebrate phylogeny is reflected in adaptations of the cardiovascular system
		The circulatory system solves this problem by ensuring that no substance has to diffuse very far to enter or leave a cell.
		Adaptations of cardiovascular systems are correlated with gill breathing in aquatic vertebrates and lung breathing in terrestrial vertebrates
	www.langara.bc.ca /biology/mario/Biol1116notes/biol1116chap23.html (1551 words)

	Re: How animals circulatory systems (open/closed) are suited to their lifestyle
		This is a good question, and one that has been studied quite extensively, briefly put however, with the closed circulatory system, blood remains in the blood vessels, with the open circulatory system, blood is pumped into the body spaces (sinuses).
		For example, the earthworm has a closed circulatory system consisting of a heart with 5 aortic arches and a dorsal blood vessel, the basic function is to transport digested nutrients to the cells.
		In many adult insects the open circulatory system is specialized and operates in a highly sophisticated manner to regulate body temperature.
	www.madsci.org /posts/archives/1999-08/935025000.Gb.r.html (287 words)

	Circulatory System
		Arthropods, like insects and spiders, have an open circulatory system, in which the blood is pumped forward by the heart, but then flows through the body cavity, directly bathing the internal organs.
		Vertebrates, like humans, have a closed circulatory system in which the blood stays in the circulatory system as it circulates, and chemicals are exchanged by diffusion.
		Our system is also called our Cardiovascular System: another name for the circulatory system, consisting of heart, arteries, and veins','(cardio = heart, vascul = a little vessel)','../../sounds/bio105/cardiovascular.wav')" onMouseOver="window.status='Another name for circulatory system'; return true">cardiovascular system, and is composed of our heart plus our arteries and veins.
	biology.clc.uc.edu /courses/bio105/circulat.htm (2764 words)

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