Final answer:
The false statement about blood is that its pH normally falls between 6.5 and 6.8. Blood's actual pH range is 7.35 to 7.45, making it slightly alkaline, not acidic.
Step-by-step explanation:
The false statement about blood is that 'Blood pH normally falls between 6.5 and 6.8.' The pH of blood in a healthy person actually ranges from 7.35 to 7.45, making it slightly basic (alkaline) rather than acidic. Therefore, the blood is not 'slightly more acidic than water,' which has a neutral pH of 7.0. Instead, blood helps to maintain homeostasis by stabilizing pH, temperature, osmotic pressure, and by eliminating excess heat.
Blood indeed performs immune functions by transporting disease-fighting white blood cells to sites of infection. Furthermore, blood is more viscous than water due to the presence of plasma proteins and formed elements like red blood cells, white blood cells, and platelets.