Question

what is the relation between body weight and heart beat rate.

Answer 1

Your heart is essentially a pump, designed to circulate blood throughout your body. Your bloodstream carries nutrients and oxygen to cells throughout your body, and carries away carbon dioxide and other byproducts of cellular metabolism. Many things can interfere with your heart's ability to pump efficiently, including excess unhealthy body weight.

Answer 2

Higher the weight, lower heart beat rate. Heart beat of sparrow is higher than elephant.