Usually pictured in blue, what are the blood vessels that carry blood toward the heart?

What are the tiny, thin walled blood vessels that allow the exchange of gases and nutrients between the blood and the cells?

If a sample of blood is oxygenated, did it most likely come from an artery or a vein?

True or false, arteries ALWAYS carry oxygenated blood.

From which chamber of the heart does deoxygenated blood leave on its way to the lungs?

What makes up the majority of the blood?

Blood clotting is the process by which blood seals wounds to keep it from leaking out of an injured blood vessel, true or false?

Which blood cells contain hemoglobin?

Where are blood cells produced?

Which type of blood cell fight disease causing organisms in the blood?

When you exhale air, does the air pass through the trachea or the pharynx first?

You are given a sample from a person's lungs. Looking at it under the microscope, you see many little round sacs that are covered in capillaries. What structures are you looking at?