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Consider an atom.  What can vary without changing the identity of the element?   

Deoxygenated blood enters the heart in the ______________.

The adrenal cortex is associated with _____________.

Reed-Sternberg cells (RSCs) are large multi-nucleated lymphoid cells. They result from a specific cell type that grows but fails to completely divide, differentiate, or act normally. The presence of RSCs results in a reduced number of antibodies in the blood but does not affect cells that trigger apoptosis. Based on this information, what line of cells give rise to RSCs and why did you choose that answer?

Following exercise, people are frequently dehydrated. Neurons in the kidneys send signals to the hypothalamus about pressure levels in the kidneys. If the pressure drops too low, the hypothalamus triggers the pituitary gland to release vasopressin, which constricts blood vessels and tells the kidneys to take up as much water as possible, reducing urine production. In this particular case, the neurons in te kidneys as a(n) _________.

The most abundant formed element in the blood is ___________.

A pregnant woman is driving along a country road when she is in a terrible car accident. An ambulance rushes her to the nearest hospital because she is losing blood. As she arrives, she lets the doctors know she has type AB- blood and quickly loses consciousness. The doctors order a blood transfusion and must choose from the following types. Which is NOT an option?

Hormones released from the posterior pituitary are produced in the ___________.

Epinephrine causes dilation of blood vessels in the skeletal muscles, constriction of blood vessels in the digestive tract, and release of glucose from the liver. This is because __________.

Which of the following, formerly called manic depression, is characterized by alternating periods of depression and mania or hypomania?