Erythrocytes are cells in the blood characterized as round,…

Erythrocytes are cells in the blood characterized as round, somewhat flattened, red disks. What red, iron-containing molecule is contained in erythrocytes whose function is to bind to oxygen and carry it from the lungs to every cell in the body and from the cells back to the lungs?

A patient allergic to peanuts started eating a peanut butter…

A patient allergic to peanuts started eating a peanut butter sandwich and immediately began experiencing severe respiratory distress, hypotension, and was displaying signs of shock. Which of the following most accurately describes the severe, life-threatening systemic reaction the patient is experiencing?