The skin contains a precursor to vitamin D that, when activated, allows for which action?
Elimination of toxins from the blood
Increase in red blood cell production
Absorption of calcium from the digestive tract
Conservation of water in the plasma
Correct Answer : C
Absorption of calcium from the digestive tract. This is because vitamin D is essential for maintaining bone density and healthy bone growth, and it stimulates calcium and phosphate uptake from the food we eat. Vitamin D is produced when the skin is exposed to ultraviolet rays from the sun, which convert a precursor molecule in the skin to an active form that travels to the liver and kidneys.
Choice A is wrong because elimination of toxins from the blood is not related to vitamin D, but to the kidneys and liver functions.
Choice B is wrong because increase in red blood cell production is not related to vitamin D, but to erythropoietin, a hormone produced by the kidneys.
Choice D is wrong because conservation of water in the plasma is not related to vitamin D, but to antidiuretic hormone, a hormone produced by the pituitary gland.
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Related Questions
Correct Answer is D
Explanation
The malleus, incus, and stapes are the three tiny bones in the middle ear that transmit sound vibrations from the tympanic membrane (eardrum) to the oval window of the inner ear.
They are also called the auditory ossicles or ear bones.
Choice A is wrong because the nose does not contain any bones, only cartilage and soft tissue.
Choice B is wrong because the brain does not contain any bones, only neurons and glial cells.
Choice C is wrong because the throat does not contain any bones, only muscles and glands.
Choice D is right because the ear contains the malleus, incus, and stapes in its middle part. They are the smallest bones in the body and are named after their shape: malleus (hammer), incus (anvil), and stapes (stirrup).
Correct Answer is C
Explanation
Oxytocin is a hormone that is produced by the posterior pituitary gland. The posterior pituitary gland stores and releases just two hormones: oxytocin and antidiuretic hormone (ADH, or vasopressin).
Choice A is wrong because estrogen is not produced by the posterior pituitary gland, but by the ovaries.
Choice B is wrong because luteinizing hormone (LH) is not produced by the posterior pituitary gland, but by the anterior pituitary gland.
Choice D is wrong because follicle stimulating hormone (FSH) is not produced by the posterior pituitary gland, but by the anterior pituitary gland.
Oxytocin has several functions in the body, such as facilitating uterine contractions during labor, allowing for milk let-down during breastfeeding, promoting social bonding, and moderating testosterone levels. ADH helps regulate the water balance in the body by controlling the amount of water the kidneys reabsorb while they’re filtering wastes out of the blood.
Correct Answer is D
Explanation
Connective tissue is the most abundant type of tissue in the human body. It is widely distributed and varied, and it includes fibrous tissues, fat, cartilage, bone, bone marrow, and blood.
Choice A is wrong because muscle tissue is not the most abundant type of tissue in the human body. It constitutes around 40% of total body weight and has around 700 muscles.
Choice B is wrong because nervous tissue is not the most abundant type of tissue in the human body. It consists of neurons and neuroglia that transmit and process information.
Choice C is wrong because epithelial tissue is not the most abundant type of tissue in the human body. It covers the body and many of its parts, and forms glands.
Correct Answer is B
Explanation
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