Blood

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According to For Dummies, deoxygenated blood is blood that has no oxygen. Blood becomes deoxygenated after receiving carbon dioxide in exchange for carbon dioxide, which occurs at the cell membrane during respiration and circulation.

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  • Why does rigor mortis occur?

    Q: Why does rigor mortis occur?

    A: Rigor mortis occurs because, after death, the muscles of the body partially contract, but they are unable to return to their relaxed state. About.com further explains that this causes the muscles to become fixed in place for around 72 hours.
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  • What causes capillaries to dilate?

    Q: What causes capillaries to dilate?

    A: Dilated capillaries are caused by a variety of factors, including radiation, sun damage, pregnancy, unbalanced estrogen levels and rosacea, according to Care Fair. They may also be caused by prescription medications or autoimmune diseases. Lifestyle factors like heavy drinking, smoking, or harsh scrubbing of the face can also cause dilated capillaries. Occasionally, dilated capillaries may appear in skin without medical problems due to heredity or the natural aging process, according to Dr. David Green.
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  • How fast does the body replace blood?

    Q: How fast does the body replace blood?

    A: Different components of human blood are replaced at different rates. According to the AABB, a non-profit organization that represents organizations that conduct blood transfusions, plasma is replaced within a few hours of a blood donation while the red blood cells take a few weeks to replace. Doctors usually only remove about one pint of blood during a transfusion, which represents about 10 percent of the total blood volume.
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  • What happens when blood is too thick?

    Q: What happens when blood is too thick?

    A: When blood is too thick, it clots more easily, and the potential exists for blockage of the blood flow through the arteries and veins, according to the National Heart, Lung and Blood Institute. This may trigger a heart attack or stroke. Polycythemia vera is a condition in which the body produces too many red blood cells, causing thickening of the blood and increasing the possibility that clotting occurs.
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  • Why does blood smell like metal?

    Q: Why does blood smell like metal?

    A: Owing to its iron content, human blood smells like metal to many people. In fact, when people rub their skin along certain iron-containing objects, such as coins, perspiration reacts with the iron to produce a metallic smell, according to LiveScience.com.
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  • What is the difference between warm-blooded and cold-blooded animals?

    Q: What is the difference between warm-blooded and cold-blooded animals?

    A: The difference between warm-blooded and cold-blooded animals involves the body temperature of the animal. Birds and mammals have warm blood and attempt to keep their internal parts at a set temperature. In a colder environment, their bodies create heat, and when they are in a warmer environment, their bodies cool themselves. Cold-blooded animals have the same temperature as their environment.
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  • What is the difference between arterial and venous blood?

    Q: What is the difference between arterial and venous blood?

    A: In the strictest sense, blood that is being carried toward the heart is venous, while blood being carried away from the heart is arterial, according to Dictionary.com. However, with the exception of the blood carried by the pulmonary arteries and veins, blood in the arteries also carries more oxygen than blood in the veins.
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  • Can your blood group change?

    Q: Can your blood group change?

    A: In-vivo, the blood group of a person is dictated by genetics and cannot be changed, according to Dr. Mehmet Oz, a professor of surgery at the Columbia University. The reported blood group changes are likely caused by a testing error during the initial test.
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  • How many liters of blood are in the human body?

    Q: How many liters of blood are in the human body?

    A: The average adult human carries roughly five liters of blood. This number fluctuates depending on height, weight and muscle mass.
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  • How often does blood circulate through the body?

    Q: How often does blood circulate through the body?

    A: According to Santa Barbara City College, for an average person, the entire volume of blood in the circulatory system is pumped through the heart approximately once per minute. The average person has 5 liters of blood in their circulatory system and a cardiac output of 4.9 liters per minute.
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  • Could a man with an AB blood type be the father of a child with type O blood?

    Q: Could a man with an AB blood type be the father of a child with type O blood?

    A: A man with type AB blood cannot be the father of a child with type O blood. A child with type O blood would have to get the O allele from both its father and mother.
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  • Why is blood classified as a tissue?

    Q: Why is blood classified as a tissue?

    A: According to School of Medicine at Southern Illinois University Carbondale, blood is classified as a type of connective tissue because it has the same mesodermal origin as other connective tissues. As About.com describes, all connective tissues, including blood, consist of cells dispersed in the extracellular matrix.
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  • What color is blood inside the body?

    Q: What color is blood inside the body?

    A: Human blood is red inside the body because of the numerous red blood cells, which contain hemoglobin. However, the blood color ranges from bright red to dark red.
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  • Why do girls blush?

    Q: Why do girls blush?

    A: According to HowStuffWorks, blushing is an automatic response to embarrassment and self-consciousness. Embarrassment causes a release of adrenaline hormones that cause blood vessels to dilate. These dilated blood vessels affect the veins in the face, and the increased blood flow causes a reddened appearance.
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  • How much is one unit of blood?

    Q: How much is one unit of blood?

    A: A unit of blood is equivalent to approximately 1 pint or 450 milliliters, according to the Canadian Blood Services website. The average patient requires around 4.6 units of blood.
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  • What is the function of hemoglobin?

    Q: What is the function of hemoglobin?

    A: InnovateUs states that the main function of hemoglobin is transporting oxygen from the lungs to other parts of the body. It is an important chemical in red blood cells that carries oxygen, and performs different effect modulation and gas transport duties.
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  • What happens if you receive the wrong blood type?

    Q: What happens if you receive the wrong blood type?

    A: Receiving the wrong blood type can lead to a severe reaction that is potentially life threatening, according to WebMD. Symptoms such as fever, hives, shortness of breath, chills, low blood pressure and pain are all reactions that can range from mild to severe that are linked to blood transfusions. This is a rare occurrence caused by human error that happens in just one out of every 14,000 transfusions performed.
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  • How does oxygenated blood become deoxygenated?

    Q: How does oxygenated blood become deoxygenated?

    A: Red blood cells contain a protein called hemoglobin that takes up and releases oxygen in response to the environment around it. Hemoglobin is what's called a "metalloprotein" because it incorporates atoms of iron into its structure. This iron is positively charged and readily binds with oxygen. In oxygen-poor environments, the hemoglobin releases the oxygen it carries and picks up carbon dioxide.
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  • What causes a ruptured blood vessel?

    Q: What causes a ruptured blood vessel?

    A: Broken blood vessels can occur for a variety of reasons, such as sun damage, heredity, aging, eating hot or spicy foods, exercise, stress, hormones, alcohol use, cortisone medications, rare skin diseases and direct trauma to the skin. This condition is known as telangiectasias and is observed when the vessels under the skin dilate and become visible, according to leading dermatologists from DermApproved.
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  • What is hematopoiesis?

    Q: What is hematopoiesis?

    A: Hematopoiesis is defined as the process of blood cell production, multiplication and specialization in the bone marrow. This process typically starts with the most basic blood cells, called stem cells according to Austin Peay State University.
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  • What is deoxygenated blood?

    Q: What is deoxygenated blood?

    A: According to For Dummies, deoxygenated blood is blood that has no oxygen. Blood becomes deoxygenated after receiving carbon dioxide in exchange for carbon dioxide, which occurs at the cell membrane during respiration and circulation.
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