Which of the following bodily fluids does NOT transmit HIV?

Ion channels that open when a chemical binds to a receptor are:

a. Ligand-gated channels b. Voltage-gated channels c. Modality/pressure-gated channels

The medial margin of the left lung is indented where?

A) Splenic notch B) Cardiac notch C) Pulmonary notch D) Aortic notch