Final answer:
True, an infection occurs when microbes invade and grow in the body. This can happen through wounds or the respiratory or digestive tract, leading to localized or systemic infections.
Step-by-step explanation:
True, an infection occurs when microbes invade and grow in the body. An infection is the successful colonization of a host by a microorganism, known as a pathogen, which can lead to disease and cause signs and symptoms. The invasion and growth of microbes in the body can occur through portals of entry such as wounds or through the respiratory or digestive tract.
For example, when bacteria enter a wound, they may multiply and cause a localized infection in the skin or may reach the bloodstream, resulting in a systemic infection. Infections can also occur when pathogens enter the body through the respiratory or digestive tract and multiply in the respiratory or gastrointestinal system.
Overall, the invasion and growth of microbes in the body is a key factor in the development of infectious diseases.