Quick, the total number of blood vessels in a human body?
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Mission impossible. While you can count major arteries and veins (and maybe arterioles and venules if you try really really hard), it is impossible to know the precise number of capillaries. It is in the order of millions. Ever better - this number varies from person to person and even within the same person with time, since some of them dissapear and new ones are generated all the time, esp. under certain conditions.
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http://en.wikipedia.org/wiki/Circulatory_system
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Blood is composed of several kinds of corpuscles; these formed elements of the blood constitute about 40% of whole blood. The other 60% is blood plasma, a fluid that is the blood's liquid medium, appearing yellow in color. The normal pH of human arterial blood is approximately 7.40 (normal range is 7.35-7.45). Blood that has a pH below 7.35 is acidic, while blood pH above 7.45 is alkaline. Blood pH along with arterial carbon dioxide tension (PaCO2) and HCO3 readings are helpful in determining the acid-base balance of the body. Blood is about 7% of the human body weight [1], so the average adult has a blood volume of about 5 liters, of which 2.7-3 liters is plasma. The combined surface area of all the erythrocytes in the human anatomy would be roughly 2,000 times as great as the body's exterior surface.\n\nThe corpuscles are:\n\n    * Red blood cells or erythrocytes (96%). In mammals, mature red blood cells lack a nucleus and organelles. They contain the blood's hemoglobin and distribute oxygen. The red blood cells (together with endothelial vessel cells and some other cells) are also marked by proteins that define different blood types.\n    * White blood cells or leukocytes (3.0%), are part of the immune system; they destroy infectious agents.\n    * Platelets or thrombocytes (1.0%) are responsible for blood clotting (coagulation)\n\nBlood plasma is essentially an aqueous solution containing 96% water, 4% blood plasma proteins, and trace amounts of other materials. Some components are:\n\n    * albumin\n    * blood clotting factors\n    * immunoglobulins (antibodies)\n    * hormones\n    * various other proteins\n    * various electrolytes (mainly sodium and chlorine)\n\nTogether, plasma and corpuscles form a non-Newtonian fluid whose flow properties are uniquely adapted to the architecture of the blood vessels.
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cough releases an explosive charge of air that moves at speeds up to 60 mph.\n\nA fetus acquires fingerprints at the age of three months.\n\nA fingernail or toenail takes about 6 months to grow from base to tip.\n\nA healthy individual releases 3.5 oz. of gas in a single flatulent emission, or about 17 oz. in a day.\n\nA human being loses an average of 40 to 100 strands of hair a day.\n\nA person will die from total lack of sleep sooner than from starvation. Death will occur about 10 days without sleep, while starvation takes a few weeks.\n\nA sneeze can exceed the speed of 100 mph.\n\nAccording to German researchers, the risk of heart attack is higher on Monday than any other day of the week.\n\nAccording to the Kinsey Institute, the biggest erect penis on record measures 13 inches. The smallest tops off at 1 3/4 inches.\n\nAfter spending hours working at a computer display, look at a blank piece of white paper. It will probably appear pink.\n\nAn average human drinks about 16, 000 gallons of water in a lifetime.\n\nAn average human scalp has 100,000 hairs.\n\nAn average person uses the bathroom 6 times per day.\n\nAn individual blood cell takes about 60 seconds to make a complete circuit of the body.\n\nBabies are born with 300 bones, but by adulthood we have only 206 in our bodies.\n\nBeards are the fastest growing hairs on the human body. If the average man never trimmed his beard, it would grow to nearly 30 feet long in his lifetime.\n\nBlondes have more hair than dark-haired people.\n\nBlood sucking hookworms inhabit 700 million people worldwide.\n\nBy age sixty, most people have lost half of their taste buds.\n\nBy the time you turn 70, your heart will have beat some two-and-a-half billion times (figuring on an average of 70 beats per minute.)\n\nEach square inch of human skin consists of twenty feet of blood vessels.\n\nEvery human spent about half an hour as a single cell.\n\nEvery person has a unique tongue print.\n\nEvery square inch of the human body has an average of 32 million bacteria on it.\n\nEvery time you lick a stamp, you're consuming 1/10 of a calorie.\n\nFingernails grow faster than toenails.\n\nFingerprints serve a function - they provide traction for the fingers to grasp things.\n\nHumans have 46 chromosomes, peas have 14 and crayfish have 200.\n\nHumans shed about 600,000 particles of skin every hour - about 1.5 pounds a year. By 70 years of age, an average person will have lost 105 pounds of skin.\n\nHumans shed and re-grow outer skin cells about every 27 days - almost 1,000 new skins in a lifetime.\n\nIf it were removed from the body, the small intestine would stretch to a length of 22 feet.\n\nIf you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.\n\nIf you go blind in one eye, you'll only lose about one-fifth of your vision (but all your depth perception.)\n\nIn a lifetime the average US resident eats more than 50 tons of food and drinks more than 13,000 gallons of liquid.\n\nIn the late 19th century, millions of human mummies were used as fuel for locomotives in Egypt where wood and coal was scarce, but mummies were plentiful.\n\nIt takes 17 muscles to smile --- 43 to frown.\n\nJaw muscles can provide about 200 pounds of force to bring the back teeth together for chewing.\n\nLab tests can detect traces of alcohol in urine six to 12 hours after a person has stopped drinking.\n\nLaughing lowers levels of stress hormones and strengthens the immune system. Six-year-olds laugh an average of 300 times a day. Adults only laugh 15 to 100 times a day.\n\nMost men have erections every hour to hour and a half during sleep.\n\nOn average women say 7,000 words per day. Men manage just over 2000.\n\nOne in every 2000 babies is born with a tooth.\n\nPregnancy in humans lasts on average about 270 days (from conception to birth).\n\nThe ashes of the average cremated person weigh nine pounds.\n\nThe average duration of sexual
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Hmmm, good question.  I guess I automatically assumed capillaries, but they might not be small enough to be considered capillaries.  On second thought, I'd go with arterioles because these vessels have oxygenated blood in them (meaning they came from the heart), are too small to be arteries but not small enough to be capillaries, and are obviously not viens.
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Circulation of Blood..
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Your skin is your largest organ. It covers your entire body and has a surface area of around 2 square metres. Its thickness varies from 0.5mm on your eyelids to 4mm or more on the palms of your hands and the soles of your feet. In total, it accounts for around 16 percent of your body weight.
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Blood actually comprises 7% of total body weight.  In an average size, 150-pound man, the volume of blood is about five quarts. \n\nListed below is a website with more info about blood, in the form of quizzes.
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a closed circulatory system is the type humans have.the blood flows through the blood vessels like arteries,veins and capillaries.in an open system,the blood vessels are either completely absent or not completely closed.
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Through our circulatory system or blood.
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The system of veins and arteries that moves (circulates) the blood around in your body.
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* Cardiovascular system: blood circulations with heart and blood vessels\n    * Digestive system: processing food with mouth, stomach and intestines\n    * Endocrine system: communicating within the body using hormones\n    * Immune system: defending against disease-causing agents\n    * Integumentary system: skin, hair and nails\n    * Lymphatic system: structures involved in the transfer of lymph between tissues and the bloodstream\n    * Muscular system: moving the body\n    * Nervous system: collecting, transferring and processing information with brain and nerves\n    * Reproductive system: the sex organs\n    * Respiratory system: the organs used for breathing, the lungs\n    * Skeletal system: structural support and protection through bones\n    * Urinary system: the kidneys and associated structures involved in the production and excretion of urine
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At birth the human body has about 350 bones, but by the time adulthood arrives, some of the bones have fused together to give us a total of 206 bones in an adult body.
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Body weight may be divided into three types: bones, muscle and fat. In a healthy female of average weight, bones make up 12 percent of total body weight, muscle/lean tissue about 35 percent and body fat about 27 percent. The remaining body weight is skin, connective tissue, tendons, blood, organs and so forth.\n\nThe number of muscles in the human body varies from about 656 to 850, depending on which expert you consult. No exact figure is available because there are a variety of opinions about what constitutes a distinct muscle (versus a part of a complex muscle). Also, there is some variability in muscular structure between individuals.
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The blood vessels fill up
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3/4 th of the human body is water. Blood is the best medium for water to circulate the water along with blood, so that no part of body gets dehydrated.The blood mostly consists of plasma which is mostly water. Thus most of the blood or almost all the blood is water.
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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. :-)