_____ is the ratio of benefits to the sacrifice necessary to obtain those benefits.

Match the description with the correct term regarding blood vessels.

What part of the graph shows the period during cardiac muscle action potentials in which slow Ca+ channels are open causing prolonged depolarization? 

Once​ collected, lymph is ultimately transported into​ __________.

BONUS: Why is a high diastolic reading often more concerning to clinicians than a high systolic reading? 

Which of the following will NOT result in a decrease in blood vessel radius? 

What is the main function of the lymphatic​ system?     

Which of the following occurs when the coronary arteries become occluded by a clot or plaque?  Choose the best answer. 

BONUS: How did the lymphatic system make it more difficult for researchers to prove that HIV causes AIDS? 

Match the lymphatic organ/tissue with the correct description.