Following a viral infection, George has been feeling a sharp stabbing pain in the retrosternal region. The pain gets worse when he breathes deeply and when he lies down. A physical examination reveals...

Following a viral infection, George has been feeling a sharp stabbing pain in the retrosternal region. The pain gets worse when he breathes deeply and when he lies down. A physical examination reveals that he has pericarditis. Can you explain why pericarditis causes this severe pain?

Mr. Grimaldi was previously diagnosed as having a posterior pituitary tumor that causes hypersecretion of ADH. He comes to the clinic regularly to have his blood pressure checked. Would you expect his blood pressure to be chronically elevated or depressed? Why?