After destroying the hemoglobin of an aged erythrocyte, the iron is recycled into the blood and the protein is used to make

Which of the following is the best descriptor of erythrocytes?

If leukocyte levels were low, which hormone would the immune system release as a message that more leukocytes need to be made?

When the cardiovascular system sends blood to the alveoli of the lungs, one of the main purposes is to bind the molecule

In order for the left ventricle to force blood into the aorta, it must push with a large amount of pressure/force against the force of blood already in the aorta. The term for this force that the heart must overcome is

What is the name of this blue blood vessel? _______

How long is a typical erythrocyte useful for in the blood? 

Why does plaque form on the walls of arteries in coronary artery disease?

What is the name of this structure? Note that the question is not asking for the chamber. _______

If leukocyte levels were low, which hormone would the immune system release as a message that more leukocytes need to be made?