To look for potential blockages or to understand whether a patient is receiving enough blood flow to their lungs, why might a doctor prefer a pulmonary angiography as opposed to an x-ray or a CT scan? Discuss the advantages of a pulmonary angiography.

Will treating a viral infection with antibiotics affect the course of the infection? a) no; antibiotics work by inhibiting enzymes specific to bacteria. antibiotics have no effect on eukaryotic or virally encoded enzymes. b) no; antibiotics do not kill viruses because viruses do not have dna or rna. c) yes; antibiotics activate the immune system, and this decreases the severity of the infection. d) yes; antibiotics can prevent viral entry into the cell by binding to host-receptor proteins.

Avoiding excess salt and sodium may benefit a person’s health by

Explain why many people are concerned about uv rays? explain what causes the skin to burn in the sun? explain why people should avoid the sun if taking a photosensitive medication?