The density of bone tissue can change in a flexible manner to help regulate _______ levels in the blood.

What form of connective tissue attaches a muscle to a bone?  

Study the diagram above closely.  Use it and the pull-down menus to answer the following questions:

_______ are pathogenic proteins that cause diseases like Mad Cow Disease and Creutzfeldt-Jakob Disease, for which there are no cures.

What kind of cells does HIV infect and destroy?

A serious genetic disorder known as hemochromatosis is often called the rusty organ disease and affects nearly 1.5 million Americans. The disorder causes increased absorption of iron in the intestines. Which organ is ultimately responsible for maintaining iron homeostasis?

An allergic response is an overreaction of the immune system to a nonpathogenic antigen.

This is the only part of the nephron where glucose can be returned back to the blood supply.

Jillian is a top level cross country runner due to her having predominantly slow-twitch muscle fibers in her legs.  

The swallowing reflex is controlled by the ________.