What action is most responsible for the resting membrane potential in cardiac muscle cells? Select one:
a. movement of K+ through voltage-gated K+ channels
b. movement of Na+ through open Na+ channels
c. movement of Ca2+ through voltage-gated Ca2+ channels.
d. closing of Na+ and K+ voltage-gated channels

While carrying a rack of tubes containing blood to be discarded in the biohazard container, jennifer slips and falls. the tubes scatter everywhere, but, fortunately, only three of them break. this accident occurred in the main hallway, so jennifer needs to think fast and get this mess cleaned up. what ppe should jennifer apply?

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.

In the category column, classify the following activities as either health promotion or health protection. if any of these actions fall under both the categories, write both. in the reason column, write down your reason for making each classification.