Please answer the following questions IN YOUR OWN WORDS!
Answer the following questions to the best of your ability in your own words.
If you arent certain whether to include something in your answer, INCLUDE IT. Most of the time students miss points by not providing enough explanation.

1)    (5 points) Why is external respiration (breathing) necessary for cellular respiration?

2)    (8 points) a) The skin protects, but how does it protect us and from what? Describe how the epidermal dendritic cells and melanocytes protect us. b) Describe what these cells protect us from.

3)    (6 points) Describe 3 differences between connective and epithelial tissues.

4)    (4 points) How is the structure (anatomy) of cuboidal and columnar cells appropriate for their function (physiology) of secretion? In other words why do they need their shape in order to be able to secrete molecules?

5)    (8 points) You are going to run a mile. a) Briefly describe the metabolic pathway that your cells will use to generate ATP for the first 90 seconds of your mile. b) Briefly describe what metabolic pathway your cells will use to generate ATP for the remaining time it takes you to complete the mile?

*The textbook we have been using is “Human Anatomy & Physiology Eleventh Edition” by Elaine N. Marieb, R.N., Ph.D. Holyoke Community College and Katja Hoehn, M.D., Ph.D. Mount Royal University*