Prior to the onset of an action potential which of the following channel proteins are closed Select all that apply.

During which sleep stage do human vital signs decline?

The outer membrane that covers a muscle cell is which?

Water’s ability to pass in and out of a phospholipid bilayer is referred to as which of the following?

Which brain wave would we see in someone who is awake but relaxed and calm?

Which of these is the reason an action potential will only propagate in a single direction?

A PTA is entering the room of a patient who has TB.  To enter the room, the PTA is required to wear a:

If a rod or cone is hyperpolarized, which of the following happens?

Explain the steps of smooth muscle contraction .

Molecules from olfactant bind to receptors found where?