Barriers, refusal, decision making and developing a plan
CO2 from the blood is released from the blood cells into the alveoli for exhalation while O2 from the alveoli is received into the blood cells to deliver oxygen to other parts of the body
Generally depending on the antibiotic they target the phospholipids on the plasma membrane of the bacteria in your system that is making you sick I say bacteria viruses generally mutate so frequently that their phospholipids cannot be targeted which is why when you have the flu all that can cure you is time, you can only hide the symptoms.