Blood

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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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  • What does the pulmonary vein do?

    Q: What does the pulmonary vein do?

    A: The pulmonary veins carry oxygen-rich blood from the lungs to the heart. There are four such veins, according to About.com, and they all connect to the heart at the left atrium.
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  • What happens when blood reaches the lungs?

    Q: What happens when blood reaches the lungs?

    A: Blood that reaches the lungs travels throughout a network of small blood vessels, where oxygen moves into the blood and carbon dioxide moves out of the blood, according to the National Heart, Lung and Blood Institute. This oxygen-rich blood is transported through the pulmonary veins and back to the heart, where it is pumped out to the rest of the body.
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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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  • Which type of blood cells carry waste away from cells?

    Q: Which type of blood cells carry waste away from cells?

    A: Red blood cells carry waste from the cells to the lungs. Once this happens, the lungs remove the waste from the body by exhalation.
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  • What are the smallest arteries called?

    Q: What are the smallest arteries called?

    A: The smallest arteries in the body are called arterioles. Arterioles are blood vessels that help to regulate the volume of oxygenated blood available in the capillaries that supply it to tissues and cells.
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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 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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  • 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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  • What is the function of glucose in the human body?

    Q: What is the function of glucose in the human body?

    A: Glucose provides a source of energy for the human body. Experts from Georgia State University say glucose is the most important simple sugar used for human metabolism.
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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 does "positive" mean regarding your blood type?

    Q: What does "positive" mean regarding your blood type?

    A: The American Pregnancy Association explains that the presence or lack of the Rh factor determines whether a blood type is positive or negative. The Rh factor is an antigen and a protein type located on the surface of red blood cells that causes an immune system response. When individuals have the Rh factor, their blood is Rh-positive. When they do not have it, their blood is Rh-negative.
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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 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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  • 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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  • 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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  • 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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  • 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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  • What is the structure of arteries?

    Q: What is the structure of arteries?

    A: Arteries have three main layers or tunics known as the adventitia (outer), media (middle) and intima (inner). The outer layer is made of connective tissue with collagen fibers, the middle layer consists of smooth muscle and elastic fibers, and the innermost layer is composed of specialized squamous cells supported by the basement membrane of connective tissue.
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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 causes blood vessels to break?

    Q: What causes blood vessels to break?

    A: The breaking of blood vessels can be caused by trauma, various medical conditions or disease, states Reference.com. The most common cause of blood vessels breaking and bruising (discoloration due to bleeding into the skin) is trauma to the body.
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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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