When comparing skin coloration in people, there is a huge spectrum of very light pigment to very dark pigmented skin.  Please identify which of the following best describes the underlying physiological reason for this spectrum of pigmentation.

Our ability to taste is largely dependent on what other sense?

Cortisol is released from the adrenal cortex in response to adrenocorticotropic hormone (ACTH).  Based on this, which statement is true? 

Put the structures in the order that a sound wave would travel through or across through them:

The process whereby light rays are converted to an electrical signal is known as:

Extra Credit What was your favorite system studied in Biol 227, and why was it your favorite? (1 pt) What was your least favorite system studied in Biol 227, and why was it your least favorite? (1 pt)

Which of these endocrine organs is located most inferiorly?

Ricardo is walking barefoot through his garage and steps on a nail with his left foot.  His left foot quickly pulls away while his right leg straightens to steady his balance.  Which statement is true of Ricardo’s situation?

Which two structures communicate through the hypothalamo-hypophyseal portal system?

Match the receptor type with the stimulus it responds to: