Question: What functions do proteins have in the human body?

Answer 1/2
Proteins are constructed from amino acids. Their function is often due to their shape (compare to how the different parts of an engine or a clock are shaped).

Here are just SOME of the functions of proteins in animal bodies (not only in humans):

1. forms much of cell structure and much of the extracellular matrix in which cells reside;

2. as a catalyst (enzymes, which contain proteins, catalyze biochemical reactions);

3. essential for the motion of cells, like in muscles and flagella;

4. receptors for hormones and other signaling molecules;

5. the transport of materials via body fluids;

6. turning genes on and off for cell differentiation; and

7. an essential nutrient for heterotrophs (human beings are heterotrophs).
by Dr. Noh
Answer 2/2
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