Final answer:
The condition where the blood pH is greater than 7.45 is termed alkalosis, and when caused by low CO₂ levels, it is specifically known as respiratory alkalosis.
Step-by-step explanation:
The medical condition in which the pH of blood is greater than 7.45, and therefore the blood is more basic than normal, is known as alkalosis.
Specifically, when this condition is caused by lower-than-normal carbon dioxide (CO₂) levels due to respiratory reasons, it is termed respiratory alkalosis. Conditions such as lung disease, aspirin overdose, shock, and anxiety can lead to respiratory alkalosis by reducing the normal concentration of hydrogen ions (H+).