Lactase is a protein in the digestive tract that break down certain sugars found in milk. what is the main function of lactase? to provide structure to fight disease to maintain homeostasis to regulate cell reactions

The correct answer would be "to regulate cell reactions".

Lactase is an enzyme that catalyzes the hydrolyses of lactose to form glucose and galactose.

It is present in the small intestine of mammals including humans and help in digestion of milk sugar that is, lactose.

The overall reaction can be written as:

C₁₂H₂₂O₁₁ (lactose) + H₂O → C₆H₁₂O₆ (glucose) + C₆H₁₂O₆ (galactose)+ heat

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