Answer: The lungs
Explanation:
It affects lungs due to breathing it in thats when it causes the most harm are lungs weak to things in the air. So when the smoke goes in the lungs it could inside burning and many other things one of the most known lung cancer.
Explain the role of Calcium(Ca+) in askeletal muscle contraction. Role of calcium { Ca++}: By BONDING to the TROPONIN it causes the TROPOMYOSIN to MOVE from its blocking position on the active sites on the actin filaments SO the CROSS BRIDGES CAN ATTACH.
Intrinsic factor is necessity for absorption of vitamin B12
