Which of the following best describes what alveoli are?

a.

they are the smallest tubes in the respiratory system.

b.

they have a small amount of surface area.

c.

they are found on the end of bronchioles.

d.

they are comprised of millions of cells

What is a risk associated with medicines?

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.

It is just as important to develop our as it is to develop our bodies.