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What structure brings oxygenated blood back to the heart?

In what direction do molecules passively move to?

The bundles of fibers that join the left and right hemispheres of the brain and allow for communication between the two hemispheres are known as the _________. 

Which  part of the brain performs many automatic functions such as breathing, heart rate, body temperature, and controlling wake and sleep cycles? 

Identify the structure(s) where carbohydrate digestion occurs. Select all that apply. 

During a fight or flight response which part of the nervous system is activated?

In skeletal muscle cells the action potential is conducted through the ________.

What happens to a red blood cell when placed in a hypotonic solution?

Insulin and glucagon are synthesized in the pancreas.

When viewing osmosis, water goes to areas with higher concentration of________.