The pH of human blood is between :
(1) 6.5-7
(2) 7.5-8
(3) 8-9
(4) 4.5-5
Answer: (2) Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline. Blood pH, partial pressure of oxygen (pO2), partial pressure of carbon dioxide (pCO2), and HCO3– are carefully regulated by a number of homeostatic mechanisms, which exert their influence principally through the respiratory system and the urinary system in order to control the acid-base balance and respiration.
