Consider the following statements:1. Heart is three chambered in fishes.2. Heart is four chambered in birds.3. All animal of class amphibia are characterised by two pairs of limbs.4. All reptiles respire by lungs only. Which of these statements are correct?

Human physiology is the science of how the human body functions in health and disease. It includes the study of the nervous, endocrine, cardiovascular, respiratory, digestive, and urinary systems, as well as cellular and exercise physiology.