Which process moves oxygen from alveoli into nearby capillaries?
A) Active pumping by red cells B) Diffusion C) Peristalsis D) Filtration by nephrons Answer: B Explanation: Oxygen moves down […]
Biology, Respiratory System
Respiratory System
Biology, Respiratory System
Why do alveoli provide an efficient gas-exchange surface?
A) Their walls contain thick bones B) They create a large thin surface close to capillaries C) They are sealed […]