Which type of tissue is made of cells that contract and relax?
a. nervous tissue
b. epithelial tissue
c. muscle tissue
d. connective tissue user: a group of similar cells that perform a specific function is a(n)
a. organ system.
b. organ.
c. tissue.
d. organism. user: from simplest to most complex the four levels of organization of the human body are
a. tissues, cells, organs and organ systems.
b. cells, tissues, organs and organ systems.

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.

Which word can describe a person's gender identity? a) female b) intersexual c) asexual d) androgynous

Which of the following is not considered a lymph node function? to house immune cells to transport lymph to filter blood to fight infection