However, they are absorbed, usually as methyl mercury, by algae at the start of the food chain. This algae is then eaten by fish and other organisms higher in the food chain. Fish efficiently absorb methyl mercury, but excrete it very slowly. Methyl mercury is not soluble and therefore not excreted.
For example, a 10- to 15-minute brisk walk typically elevates the heart rate to 110 to 120 beats per minute. Also, the sinus node increases the heart rate when the body is stressed because of illness. In all of these circumstances, the heart rate increase is a normal response. Likewise, the sinus node signals the heart to slow down during rest or relaxation.
  Your pulse rate and blood pressure both go up as your circulatory system is trying to get enough oxygen to your tissues, with less oxygen in the blood from holding your â¦ breath, it has to move faster to try and attain equilibrium, or homeostasis.2 people found this useful. pulse raiser is a activity that raises the heart rate it increase the blood flow through the active muscle and it also increase the body temperature.