Tutor profile: Jessica M.

How does blood circulate in the heart?

Think of the heart and arteries as part of one big highway. The blood enters the superior and inferior vena cava and enters into the right atrium and then goes through the tricuspid valve into the right ventricle. From the right ventricle blood goes through the pulmonic valve into the pulmonary artery and into the lungs to be oxygenated. Once the blood has been oxygenated the blood returns to the heart by the pulmonary vein, goes into the left atrium and then through the mitral vale the blood enters the left ventricle. Blood then goes through the aorta first to the heart and brain and then to the rest of the body.

The patient is ordered amoxicillin 250 mg elixir three times a day. You have 500 mg in 5 ml available. How much liquid will you give in one dose?

Divide 250 mg by 500 mg and multiply it by 5. You would give 2.5 ml. Whenever you calculate your dosages make sure you 1. Read the question carefully to make sure you understand what dose the question is asking you to calculate. 2. The formula what you have prescribed over what you have available multiplied the volume or amount of medications you have on hand.

How does the drug lisinopril lower blood pressure?

Lisinopril is part of the class of drugs called ACE inhibitors. They lower blood pressure by stopping the hormone angiotensin I from changing into angiotensin II. Angiotensin II narrows blood vessels and increases blood pressure. Because Lisinopril stops that conversion by blocking the cell receptor sites where angiotensin II lock on, the blood vessels and arteries are not able to narrow and the blood pressure stays normal.