Human red blood cells are formed mainly in the bone marrow and are believed to have an average life span of approximately 120 days<span>.</span>
Certain elements are required in large quantities, and others are required in small amounts by the body, but both are essential for the survival of the cells. The cells which are required in large amounts are called as macronutrients, while the ones required in small quantities are called as micronutrients, or trace elements.
Hence, the answer is trace elements or micronutrients.
The answer is palpitation.