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Where in the body in Vitamin D produced and what molecule is it modified from?
Vitamin D is produced in the skin, on exposure to UV (ultravoilet) radiation, from a modified cholesterol molecule; necessary for normal bone growth and function.
3 physiological factors that affect skin color?
Melanin production: Different levels of melanin, a pigment produced by specialized cells in the skin, affect skin color. Blood circulation: Differences in blood flow to the skin can influence skin color, with increased blood flow leading to a redder appearance. Sun exposure: Exposure to ultraviolet (UV) radiation from the sun can cause the skin to darken as a result of melanin production.
What is the function of melanin in the skin and how does it contribute to skin coloration and protection?
Melanin is a pigment produced by specialized cells called melanocytes in the skin. It serves as a natural sunscreen by absorbing and scattering harmful UV radiation from the sun, protecting the skin from damage. The amount and type of melanin in the skin determine its coloration, with higher levels resulting in darker skin tones. This pigment also helps to regulate skin temperature and prevent DNA damage caused by UV exposure.
What is responsible for pigmentation?
Pigmentation in skin is primarily due to melanin, a pigment produced by specialized cells called melanocytes. Melanin absorbs UV radiation to protect the skin from damage. Genetics, sunlight exposure, hormonal changes, and certain medical conditions can influence pigmentation.
Which best describes the daughter cells produced by mitosis?
The daughter cells produced by mitosis are genetically identical to the parent cell and to each other. This process ensures that each new cell receives a complete set of chromosomes and necessary cellular components for normal function.
What is the fat soluble produced in skin on exposure to UV radiation and necessary for normal bone growth and function?
Vitamin D
Where in the body in Vitamin D produced and what molecule is it modified from?
Vitamin D is produced in the skin, on exposure to UV (ultravoilet) radiation, from a modified cholesterol molecule; necessary for normal bone growth and function.
Does milliamperage settings and exposure time determine the penetrating abilityof radiation produced?
The milliamperage setting and exposure time primarily affect the quantity or amount of radiation produced, not its penetrating ability. Penetrating ability is mainly determined by the kilovoltage setting, with higher kilovoltage resulting in more penetrating radiation.
How do you describe the two methods by which radiation is detected and two ways measured?
Radiation is detected using scintillation detectors, which convert radiation into light pulses, and Geiger-Muller detectors, which amplify the ionization produced by radiation. Two ways radiation is measured are by exposure, which quantifies the amount of ionization produced by radiation in air, and by dose, which measures the energy deposited by radiation in a material.
Can radiation from a xerox machine cause infertility?
The radiation produced by a xerox machine is low and not likely to cause infertility in humans. However, prolonged exposure to high levels of radiation from any source can potentially have adverse effects on reproductive health. It is important to follow safety guidelines and limit unnecessary exposure to radiation.
What are roentgens?
Roentgens are units of radiation exposure used for x-rays and gamma rays. They are defined in terms of the number of ions produced in one cubic centimeter of air by the radiation.
Does beta radiation cause leukemia?
Yes, exposure to beta radiation has been linked to an increased risk of developing leukemia. Beta radiation can damage bone marrow, where blood cells are produced, leading to the development of leukemia.
What does milliamperage settings and exposure time determine?
Milliamperage settings and exposure time determine the amount of radiation delivered to the patient during a radiographic procedure. Milliamperage affects the quantity of X-rays produced, while exposure time determines the duration of exposure. Adjusting these settings correctly helps to obtain diagnostic images while maintaining radiation safety standards.
What vitamin is synthesized in the skin with exposure to the sunlight?
Vitamin D is produced by ultraviolet radiation on your skin. The UV light converts a precursor molecule to vitamin D.
Which factor controls the amount of radiation emitted from the xray tube?
The exposure factors control the amount of radiation emitted from the x-ray tube. These factors include tube current (mA), tube voltage (kVp), and exposure time (seconds). Adjusting these parameters can alter the amount of radiation produced in the x-ray tube.
How many take time to remove secondary radiation after xray done?
The time it takes to remove secondary radiation after an X-ray is typically immediate, as secondary radiation, which is scattered radiation produced when the primary X-ray beam interacts with matter, diminishes rapidly. The exposure to secondary radiation usually decreases significantly within seconds after the X-ray exposure is stopped. However, the actual removal of residual radiation in the environment can vary based on factors such as room ventilation and shielding. Overall, the concern for secondary radiation is minimal once the procedure is complete.
What percentage of radiation is produced in comparison to the amount of heat produced?
The percentage of radiation produced compared to the amount of heat produced depends on the source of heat. For example, in a typical fire, about 70-90% of the heat produced is in the form of radiation. In contrast, for electric heating sources, the percentage of radiation produced is lower as most of the heat is convective.
