Answer to Question 1
Vitamin A contributes to the health of the bones. This vitamin affects the expression of genes (DNA into protein), which can affect cell development. If vitamin A is deficient, the cells that build bone may not be fully functional. This could affect the quality of the bone tissue.
Vitamin D is essential for bone health. It stimulates the small intestine to absorb more calcium from foods so that the bones can make use of the calcium. Young people who lack vitamin D during growth may have softened, misshapen bones, as is seen with rickets. Older individuals may experience softening of the bones as calcium is released from them as a result of vitamin D deficiency. This condition is known as osteomalacia.
Vitamin C is needed for the formation of collagen, the base material of bones and other connective tissues. Vitamin C deficiency, known as scurvy, leads to poorly formed connective tissue, which can cause bleeding of the gums or rashes on the skin.
Answer to Question 2
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Relative Size of the Body’s Fluid Compartments
To thoroughly clean a throttle body, it is sometimes best to remove it from the vehicle.
The leaky-barrel model: a settling-point model of eating and body weight homeostasis.
The annual pattern of rings changes with ocean temperature and coral health
Skeletal Muscle Fiber Types
The body’s survival depends on mechanisms that maintain internal homeostasis