A doctor tells her nursing students that it is important to monitor patients' blood pressure when they are receiving fluoroxinol (a medication that blocks calcium channels). Use your understanding of the role calcium plays in the heart to explain why fluoroxinol might affect a patient’s blood pressure.

In a cardiomyocyte, calcium enters the cells through A. HCN channels B. ryanodine receptors C. dihydropyridine receptors

What is the difference in the effects strenuous exercise has on your heart and the effects amphetamines has on your heart? And how can high blood pressure be hard on your heart but exercise is good?

Fill in the gaps in the paragraphs below: Blood pressure can be regulated by the nervous system, in particular the ____________________ nervous system. Initially changes to blood composition and pressure can be detected by ____________________: ____________________for pressure, ____________________for chemical changes, ____________________for temperature, and ____________________for movement. These changes are collected by the medulla oblongata in the brain, which will initiate the ____________________nerve to reduce blood pressure or the ____________________system to increase it. So when blood pressure is high, the ____________________system is used, heart rate ____________________and the systolic blood pressure ____________________. When blood pressure is too low, the ____________________system takes over, heart rate and contractility ____________________, and ____________________occurs in the blood vessels.