Question

1. The most dangerous microbial agents have what portal of entry into the human body? a. respiratory c. parenteral
b. urogenital d. fecal

2. In addition to digested food, where do carbohydrates come from in the large intestine? a. mucus secretions; b. dead cells; c. saccharolytic fungi;
d. arteries

90. Why do the residents of our normal microbiota not regularly invade other tissues of the body?

    1. They are inhibited by pathogens.

    2. They have not evolved the ability.

    3. They are not able to survive in other tissues.

    4. Our normal microbiota does regularly invade other tissues of the body.

Thank you very much!!!

Answer 1

1. Most of the deadliest pathogen on the planet target lung and cause significant damage to them and because of air borne or mucous droplet borne, they are transmitted easily and highly contagious and as compared to other mode of infection it is most frequent to occur in a population. So, the dangerous microbial agents would be a. respiratory, for example tuberculosis, pathogen to cause serious pneumonia and respiratory arrest.

Correct option: A. Respiratory

2. Most of the digestion takes place in stomach and small intestine but small fraction of digestion for carbohydrate can occur in the large intestine through fermentation process by Saccharolytic fungi. Therefore, correct answer is C. Saccarolytic fungi

Normally microorganism in the body doesn't invade tissue and live as a commensal organism but they can become pathogen if you don't fell well (due to any disease) or if you have weaker immune system. Generally, we have different environment in stomach, small intestine and large intestine ad these microorganisms are adapted and can live in a particular region or tissue but when in compromised immune system they can invade other tissues and cause pathogenicity (considered as opportuniatic). So, most relevant choice would be “They are not able to survive in other tissue”.