Gaseous exchange in lungs 

thanks for Allah .....because ...i got this channel..it helped me..a lot

Who else's teacher is making them watch is in online school :)

be honest, you're here cuz of online classes

Nice! And straight forward. Thanks a million 🙇🤗♥️

Perfect and precise explanation 💎🙏🙏🙏

Tqsm for a understanable video...❤

0:28 broccoli

WOW so informative! And a very nice voice!🥰😍

It's not 3 million alveoli it should be 300 million alveoli ❣️

Do they replace dead cell or is that it

Nyc Tq madam

Subscribed👍

Aapki awaj bahut madhur hey 😍

Hey, I want to Use your Content. What's the requirement?

nice!

i am currently awaiting my fate in the principal's office as we speak, he found my collection of bootleg shrek movies and is currently screaming me, begging me to leave the school

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