During which phase of the cardiac cycle does the tricuspid valve open?

To assist with venous return, muscles of the lower extremity contract which pushes blood proximally up through valves into large veins near the heart.  This mechanism is called the:  

Which organ detects hypoxia and releases a hormone that stimulates the red bone marrow to produce red blood cells?

Which type of blood stem cell of the red bone marrow will have both a nucleus and organelles?  

At a normal resting heart rate, most of the total volume of blood in the body is located in which of the following areas?    

Which type of blood would a person have if they have: A antigens on their RBCs anti-B-antibodies in their plasma Rh antigens on their RBC no Rh antibodies in their plasma    

Which layer of the heart wall is the thickest?

Hemostasis is the stoppage of bleeding when a blood vessel is injured.  What is the correct order of methods that occur in hemostasis?

 In microscopy, the term resolution

Which type of blood would a person have if they have: no antigens on their RBCs anti-A and anti-B antibodies in their plasma no Rh antigens on their RBC Rh antibodies in their plasma