Why are the air sacs (alveoli) in the lungs so numerous and small?
To increase the surface area available for gas exchange
2 )
To decrease the volume of air that can be held in the lungs
3 )
To make the lungs lighter and easier to move during breathing
4 )
To prevent large particles from entering the bloodstream
تحلیل ویدئویی تست
منتظریم اولین نفر تحلیلش کنه!
پرسش و پاسخ های مشابه
سوال کنید یا به سوالات دیگران پاسخ دهید ...