Final answer:
Neutrophils are constantly circulating in the blood to respond to infections and prevent harm to human cells.
Step-by-step explanation:
Neutrophils are a type of white blood cell that plays a crucial role in the immune response. They are phagocytic, meaning they engulf and destroy pathogens invading the body. Neutrophils are constantly circulating in the blood, ready to respond to any infection. Their rapid response helps prevent pathogens from multiplying and causing harm to human cells. Regarding the question of whether there is a constant population of neutrophils circulating in the blood, the answer is false. Neutrophils are white blood cells that are part of the body's immune system and play a critical role in fighting infections. While there is a steady level of production, the actual circulating population of neutrophils can vary for several reasons, such as infection, inflammation, and the body's circadian rhythms.