48 Peer Pointers

The Pupil: the pupil is not actually a “thing”… it’s really an opening in the center of the eye! Light passes through the empty space and is refracted inside of the eye. The light reaches the optic nerve, which is what allows us to see.

Emmetropia= normal vision

Hyperopia=“Farsighted”, you can see far away, but not up close

Myopia= “Nearsighted”, can only see the things closest to me

The Conjunctiva is avascular, and needs o2 to be diffused to it constantly. Tears constantly wash over the eyes when we blink, providing Oxygen. When you have a staring contest with someone, you aren’t
blinking, and o2 is not diffusing to the conjunctiva.
The urge to blink is therefore because the Conjunctiva begins to dry up.

How do we hear? Hair cells in the organ of Corti vibrate. This depolarizes and sends Action Potential to the brain. This is the primary reason
that we can hear. Loud music and antibiotics kill the hair cells, which causes hearing loss as a result.

Olfaction: smell

Receptor->neuron goes through cribriform plate-
>olfactory bulb->olfactory tract->olfactory cortex of the brain (smell is interpreted)

Gustation: taste

Tonge->Taste buds-> Gustatory cells-> Cranial Nerves-> Gustatory Cortex