Info

Layer/Tunic

Posterior Portion

Function

Anterior Portion

Function

Outer layer

Sclera

Protection

Cornea

Light transmission and refraction

Middle layer

Choroid coat

Blood supply, pigment prevents reflection

Ciliary body, iris

Accommodation; controls light intensity

Inner layer

Retina

Photoreception, impulse transmission

None

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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