Identify the structure indicated by the red arrow only

The nurse is assessing a client 12 hours postpartum. Which of the following findings should the nurse identify as expected in the immediate postpartum period? (Select all that apply.)

Which choice is the systolic blood pressure?

Given the following information, what is the pulse?

The graph below records the 

Given the following information, what is the pulse pressure?  

The arrow indicates the position at which to put a stethoscope to hear the sounds made by _________ valve

During which interval are all areas of the myocardium relaxed?

During which interval are the ventricles filling with blood

Is this organ a primary or secondary lymphoid organ?