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

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

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? 

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

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

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

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

(i)___ is the normal process of arteries hardening as we age; (ii)___ is the disease process in which plaque inhibits blood flow.