The statement that the nervous system is responsible for your sense of smell is true. The receptors that sense smells are called olfactory receptors. These receptors send impulses to your brain. The parietal lobe of the brain figures out the messages received from the five senses of sight, touch, smell, hearing and taste.
So for a 50-year-old, maximum heart rate is 220 minus 50, or 170 beats per minute.At a 50 percent exertion level, your target would be 50 percent of that maximum, or 85 beats per minute.
