The Tear System (Lacrimal Apparatus)

Paul Nathan Negrean

Mar 14, 2024 — 1 min read

This system of the body is used to keep our eyes moisturized. If the eyes go dry, we go blind. There are a few parts of this system:

The Eyes are organs used for seeing.
Lacrimal glands are located behind the upper corner of the eyes and make the salty water that becomes tears.
Meibomian glands on the edges of the eyelids produce oil that mixes with the water from the lacrimal glands to become tears.
Lacrimal puncta are what pump tears out of the eyes.
Lacrimal sacs in the inside corner of the eye collect tears that drain out of the eyes through your lacrimal puncta.
Nasolacrimal ducts are tear ducts that drain tears out of the eyes into the nose.

The eyes have a few types of cells, here are the two most important ones:

Photoreceptors detect light and turn it into an electrical signal
Retinal Ganglion Cells receive signals from photoreceptors and transmit them to the brain through the optic nerve.

A tissue that can be found in the eye is:

Retinal Pigment Epithelium helps the photoreceptor cells survive and function well.

Interactions in Ecosystems

Populations, Communities, and Ecosystems Populations are species in a community. Communities are groups of species that live together. Ecosystems are communities and non-living things in an area. In this image, we can see many populations represented, like the horse population, the llama population, the cow population, the pig population, the

World War I

World War I was one of the most destructive wars in the world's history. It involved most of the world, which was why it was called a world war. This war had its beginnings in the assassination of Archduke Franz Ferdinand, the heir apparent to the Austro-Hungarian Empire&

Archimedes

Archimedes was a Greek mathematician, physicist, engineer, astronomer, and inventor who lived in the third century BC. He is well known for predicting the use of calculus, and discovering an approximation of pi. While he was in Syracuse, the city was attacked by Rome in the years 213 and 212

Alexander Pope and An Essay on Criticism

Alexander Pope was an English poet born in 1688. He wrote many poems, including English translations of the Iliad and Odyssey. One of his most famous poems, An Essay on Criticism, is written like a guide on how to write and criticize poetry. Some points that Pope makes in his

Read more

Interactions in Ecosystems

World War I

Archimedes

Alexander Pope and An Essay on Criticism