question_answer

  Answer the following questions (a) Heart pumps blood all through the body. Can you explain the reason behind this peculiar ability of heart? (b) Animals of colder regions and fishesof cold water have thicker layer of subcutaneous fat. Why?

Answer:

  (a) Heart is made up of cardiac muscles. These cardiac muscles are involuntary muscle (not under the control of our will). These muscles show continuous rhythmic contraction and relaxation throughout life; which there by, helps the heart to pump blood.                                                                                                                                             (2) (b) Fat is a type of connective tissue (adipose tissue). It acts as a subcutaneous insulation of body for thermoregulation.                                                                                                                                                           (1)