Blood

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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  • 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 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 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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  • 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 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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  • 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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  • 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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  • 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 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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  • 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 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 is the smallest blood vessel in the body?

    Q: What is the smallest blood vessel in the body?

    A: The smallest blood vessels in the human body are capillaries, which connect arteries and veins. Capillaries can be as small as 5 micrometers wide. The average adult body has about 10 billion capillaries.
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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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  • 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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  • 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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  • 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 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 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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  • 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 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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  • 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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