A drug blocks ligand-gated channels. What effects would you expect?

A strong acid is added to a buffered solution. What will likely happen?

What biological mechanisms establish the absolute refractory period, and how does this ensure unidirectional action potential propagation under normal physiological conditions? (Select ALL that apply.)

A hormone enters a target cell and binds to a receptor in the nucleus. Which properties does this hormone likely have?

You’re designing a new drug to treat allergies. You’d like for your therapy to be able to dissolve through the lipid bilayers of cell membranes; therefore, _________blank molecules will make excellent drug choices.

A hormone is released from an endocrine gland and quickly dissolves in blood plasma without needing a carrier. Which features best describe this hormone?

Explain surface-area/volume ratio and its importance to physiology.

A protein is found in blood that is produced by the pancreas and acts on receptors of cells in the liver. What type of chemical messenger is it most likely to be?

In Mexican Accounts of the Conquest, how did Aztec noblemen respond to Montezuma after he gave the Spanish all of the food and supplies that they wanted?

A chemical messenger is found in high levels in the blood but only affects certain cells. Why?