Mildred is in her 20s. Her doctor tells her that she is gradually losing muscle mass and strength especially in her back and legs. Her doctor has advised her to exercise regularly and focus on her diet as a strategy to slow down the decline of muscle mass and strength. Which of the following terms best describes Mildred's condition? A) sarcoma
B) osteopenia
C) osteoporosis
D) sarcopenia

As you sit in the library with your friend studying for your weekly quiz on the integumentary system, you come upon an article about the hazards of prolonged exposure to the sun's rays. your curious nature leads you to research the subject further. you're fascinated to learn that minimal exposure to the sun allows you skin to manufacture vitamin d, which is important to maintain homeostasis. you also read that although sunscreen can protect you from the ultraviolet (uv) rays of the sun, some medications can actually increase a person's sensitivity to the sunlight.