Answered: What are tears and what structure…

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question

What are tears and what structure secretes them?

Expert Solution

Step 1

Tears are a reasonable fluid discharged by the lacrimal organs (tear organ) Their capacities incorporate greasing up the eyes (basal tears), eliminating aggravations (reflex tears), and helping the safe framework. Tears additionally happen as a piece of the body's characteristic agony reaction. Tears are comprised of water, electrolytes, proteins, lipids, and mucins that structure layers on the outside of the eyes. The various kinds of tears—basal, reflex, and passionate—differ fundamentally in the arrangement.
Tears are secreted from the lacrimal gland. The lacrimal organ is found anteriorly in the superolateral part of the circle, inside the lacrimal fossa – a downturn in the orbital plate of the frontal bone. Lacrimal gland → lacrimal ducts → ocular surface → lacrimal puncta → lacrimal canaliculi → lacrimal sac → nasolacrimal duct → inferior nasal meatus → nasopharynx.