Atmospheric Pressure at Sea Level Is Equal to a Column

question 21

Multiple Choice

Atmospheric pressure at sea level is equal to a column of 760 mm Hg.Oxygen makes up 21% of the atmosphere by volume.The partial pressure of oxygen in such conditions is

• A)160 mm Hg.
• B)16 mm Hg.
• C)1.6 mm Hg.
• D)760 mm Hg.

---

Definitions:

Synaptic Cleft

The small gap at a synapse between neurons, through which neurotransmitters are released to transmit nerve impulses.

Neurotransmitter

Chemical substances that transmit signals across a synapse from one neuron to another in the nervous system.

Serotonin Transporter

A protein that facilitates the reuptake of serotonin from the synaptic cleft back into the presynaptic neuron, playing a key role in regulating mood.

Endorphins

Natural painkillers produced by the body, often released in response to stress or exercise, contributing to feelings of well-being and euphoria.