Why do veins also have valves?
a. to keep the blood from circulating too fast
b. to regulate contractions of the heart
c. to keep the veins from losing blood
d. to prevent gravity from pulling the blood towards the feet

Which of the following affected by the nerve damage?

A35-year-old woman comes to the ed complaining of chest pressure. she has had such episodes intermittently over the last 5 years, usually when sleeping, but over the last year she has had more frequent severe symptoms that are occasionally associated with severe migraine headaches. the pain is midsternal and is described as pressure that extends as a band around her chest. the ed physician is initially dubious that the pain is cardiac in origin, because the woman has no coronary disease risk factors. an ecg, however, shows 2mm st-segment elevation and inverted t waves in leads v1 through v5 and 1mm st-segment depression in leads ii, iii, and avf. before the cardiologist arrives in the ed, the patient's ecg has returned to normal. this repeat normal ecg is obtained after the administration of aspirin, nitroglycerin, morphine, and oxygen. which of the following is most likely for these findings? - diffuse intimal thickening with focal areas of atherosclerotic narrowing - intermittent thrombus formation and lysis in the left anterior descending artery - intermittent thrombus formation and lysis in the right coronary artery - plaque rupture and thrombus formation in the left anterior descending artery - transiently increased coronary vascular tone in the right coronary artery

Jen is reviewing information about a new treatment for arthritis pain that she saw on an informational website. most of the information is testimonials from satisfied users. which best indicates that this information is unreliable? it is not paid for by product sponsors. it is on a website that is not run by professionals. its claims are based mostly on anecdotal evidence. its claims are not supported by the provided information.