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www.reptilesmagazine.com/Kid-Corner/Beyond-Beginners/Snake-Anatomy...

The lung portion nearest the tail, regardless of the lung’s size, is more of an air sac. The inside of these sac portions look more like the inside of a balloon than a lung. There is no exchange of respiratory gases. Snake Anatomy Introduction>> Snake Cardiovascular System Anatomy>> Snake Immune System Anatomy>> Snake Gastrointestinal Tract ...

en.wikivet.net/Snake_Respiratory_System

Lungs. The lung morphology of snakes is very species-dependent but is obviously elongated. The left lung is always reduced but may vary from 85% of the length of the right lung to being absent. It is relatively well developed in boids but only vestigial in colubrids. The anterior part of the lung is non-respiratory and functions as an air sac ...

en.wikipedia.org/wiki/Snake

Snake vision varies greatly, from only being able to distinguish light from dark to keen eyesight, but the main trend is that their vision is adequate although not sharp, and allows them to track movements. Generally, vision is best in arboreal snakes and weakest in burrowing snakes.

animals.howstuffworks.com/snakes/snake1.htm

When the snake's mouth is full, it has to extend its trachea (breathing tube) below the food and out in order to keep breathing. Snakes do not have a diaphragm like people do, so they circulate air in and out of the lungs by narrowing the rib cage to push air out and then widening it again to create a vacuum to suck air in.

www.reference.com/pets-animals/snakes-breathe-59fc88c56c4680a0

Snakes breathe by moving the muscles that surround the ribcage. They lack the diaphragm that drives the respiratory process of mammals. A muscular contraction pushes air out of the lungs. When the muscles relax, the lungs fill with air. The work of exchanging carbon dioxide for oxygen in the snake's respiratory process depends on the right lung.

www.ncbi.nlm.nih.gov/pubmed/7114286

Functional anatomy of the lung of the snake Pituophis melanoleucus. Stinner JN. The respiratory system in Pituophis melanoleucus is composed of a trachea, a single bronchial lung containing the pulmonary vasculature, and a large membranous caudal air sac.

sites.google.com/.../human-and-snake-respiratory-system

Also, humans have 2 fully developed lungs. Snakes generally only have one(the right), however some species have 2 or 4 lungs, a semi-developed lung (the left) and a pair of primordial tracheal lungs (located beside the throat). Another lung difference is that snakes have 2 separate lung chambers in the right lung.

www.webmd.com/first-aid/ss/slideshow-snakebite-treatment

If you’ve been bitten by a snake, get medical help right away. ... It can also paralyze the muscles that control your heart and lungs. If it’s not treated in time, one of these bites can be ...

www.answers.com/Q/Do_snakes_have_lungs

YES. Snakes do not have a diaphragm like people do, so they circulate air in and out of the lungs by narrowing the rib cage to push air out and then widening it again to create a vacuum to suck ...

www.britannica.com/animal/reptile/Circulatory-system

Reptile - Circulatory system: Modern reptiles do not have the capacity for the rapid sustained activity found in birds and mammals. It is generally accepted that this lower capacity is related to differences in the circulatory and respiratory systems. Before the origin of lungs, the vertebrate circulatory system had a single circuit: in the fishes, blood flows from heart to gills to body and ...