The answer is proteins.
Proteins are made of amino acids and they determine each and every function of your body, from the process of digestion to the structure of your own hairs, even your eye and skin colour just everything. It depends on the polypeptide sequence of each protein as all have a different sequence and thus will lead to different types of bonding shapes, giving each and every protein of our body a function.
<span>The carry chemical messages throughout the body.</span>
Hydrophilic (water-loving) or could be called water, it mean attracting water molecules as close as possible, the phospholipid is made up of a head that is polar, and a tail that is non polar or in another words called “hydrophobic” , this means that the head of the phospholipid is attracted to water molecules ( this helps you understand the structure of cell membrane formation). Steriod, a class of lipids, some hormones like cholesterol are made up of steroids. They maintain fluidity of cell membrane. Example: oestrogens
<u>afferent signals</u> flow inward to the central nervous system from sensors in the periphery, while <u>efferent signals</u> flow outward from the central nervous system to the periphery.
Due to technical problems, you will find the complete explanation about the reflex arc in the attached files.
You will learn more about the reflex arc at
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