Mesenteric arteries deliver blood to the following organs and regions:  

Arterial blood has a dark red color due to deoxygenated hemoglobin, compared to the venous blood with scarlet red color and high level of oxygenated hemoglobin.

The SA- node is located in the right ventricle.

The thoroughfare channel is formed as a result of:

Oxygen (O2) binds to __________________________ in the hemoglobin; _______________________competes with oxygen for binding to hemoglobin.

Which vessels play a key role in regulating blood flow into capillaries?

Match the labeled with letters structures on the figure (found in the left column) with their anatomical name using the drop-down arrow next to the right column.

As arteries stiffen with age and atherosclerosis develops, how would you explain the the physiological consequences of this process?

The umbilical vein carries deoxygenated blood to the fetal heart.  

Cardiac reserve is the following: