Which organ is primarily responsible for gas exchange with the bloodstream?

Study for the Pivot Point The Building Blocks of the Human Body 105E.01. Engage with multiple choice questions and flashcards, complete with hints and explanations. Get ready for your exam!

Multiple Choice

Which organ is primarily responsible for gas exchange with the bloodstream?

Explanation:
Gas exchange with the bloodstream happens mainly in the lungs, where oxygen from inhaled air diffuses into the blood and carbon dioxide diffuses out to be breathed out. This diffusion occurs across the very thin walls of the alveoli, which are surrounded by a dense network of capillaries, taking advantage of partial pressure differences. The lungs provide a large surface area and a moist, thin barrier that facilitates rapid diffusion, aided by surfactant that helps keep the alveoli open. The skin can’t match this efficiency in humans, and the brain and heart don’t perform gas exchange themselves — they rely on blood that has already carried gases to and from the lungs. So, the lungs are the primary organ responsible for gas exchange.

Gas exchange with the bloodstream happens mainly in the lungs, where oxygen from inhaled air diffuses into the blood and carbon dioxide diffuses out to be breathed out. This diffusion occurs across the very thin walls of the alveoli, which are surrounded by a dense network of capillaries, taking advantage of partial pressure differences. The lungs provide a large surface area and a moist, thin barrier that facilitates rapid diffusion, aided by surfactant that helps keep the alveoli open. The skin can’t match this efficiency in humans, and the brain and heart don’t perform gas exchange themselves — they rely on blood that has already carried gases to and from the lungs. So, the lungs are the primary organ responsible for gas exchange.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy