a. What structure of the respiratory system is indicated by the pointer? b. Is this a conducting zone or a respiratory zone?

Name three factors that are important in the regulation of a target cell’s response to a chemical messenger.

Name the 5 parts of the alimentary canal wall: A B C D E

a. What cells of the thyroid are indicated by the pointer? b. What hormones do these cells produce?

a. Name the endocrine organ labeled A. b. Name the endocrine organ labeled B, c. What is one hormone produced by A? d. What is one hormone produced by B?

Cholera is the leading cause of death in children in developing countries, characterized by massive diarrhea. The effects stem from an extracellular toxin that the bacterium Vibrio cholerae releases into the gut. The toxin acts on a ________ that overstimulates ________ which causes a cascade of events that leads to electrolytes leaving the cell and causing water to follow them into the lumen of the intestine, resulting in severe diarrhea.

What is the blood type of this sample? What antigens can be found on the red blood cells of this sample?

Which of the following accurately represents the order of complexity for the components of the body, from least to most complex?

Typical responses to ________ messengers require a long time to develop because.  What type of messengers elicit a long response time?  Why?

Select an example of a long-loop negative feedback.