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Which of the following bacterial species is considered normal flora of the mouth? O 1) Streptococcus mutans O 2) Escherichia coli 3) Klebsiella pneumoniae O 4) Staphylococcus epidermidis

Which of the following bacterial species is considered normal flora of the mouth? O 1) Streptococcus mutans O 2) Escherichia coli 3) Klebsiella pneumoniae O 4) Staphylococcus epidermidis

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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### Understanding Normal Flora in the Mouth **Question:** Which of the following bacterial species is considered normal flora of the mouth? **Options:** 1. Streptococcus mutans 2. Escherichia coli 3. Klebsiella pneumoniae 4. Staphylococcus epidermidis **Explanation:** The term "normal flora" refers to the microorganisms that naturally reside at various sites on and within the human body without causing harm under normal circumstances. These flora play crucial roles, such as aiding in digestion, producing vitamins, and protecting against pathogenic organisms. #### Streptococcus mutans (Option 1): - **Role in the Mouth:** This bacterium is part of the normal flora of the human oral cavity. It plays a significant role in the formation of dental plaque and can contribute to tooth decay by producing acids from dietary sugars. #### Escherichia coli (Option 2): - **Role in the Mouth:** Escherichia coli is typically found in the intestines and is a major component of the gut flora. It is not normally found in the mouth and is thus not considered part of the oral normal flora. #### Klebsiella pneumoniae (Option 3): - **Role in the Mouth:** Klebsiella pneumoniae is usually found in the gut and respiratory tract. It is not a normal inhabitant of the oral cavity and can cause infections if found there. #### Staphylococcus epidermidis (Option 4): - **Role in the Mouth:** This bacterium is commonly found on the skin and mucous membranes. It can be part of the oral flora but is more widely recognized for its presence on the skin and in the upper respiratory tract. **Correct Answer:** **1) Streptococcus mutans** This question helps in understanding the types of bacteria that constitute the normal flora of various parts of the body and their roles in health and disease. For further reading on this topic, consider the impact of these bacteria on oral health, the balance between beneficial and harmful microorganisms, and the implications for dental hygiene practices.
Transcribed Image Text:### Understanding Normal Flora in the Mouth **Question:** Which of the following bacterial species is considered normal flora of the mouth? **Options:** 1. Streptococcus mutans 2. Escherichia coli 3. Klebsiella pneumoniae 4. Staphylococcus epidermidis **Explanation:** The term "normal flora" refers to the microorganisms that naturally reside at various sites on and within the human body without causing harm under normal circumstances. These flora play crucial roles, such as aiding in digestion, producing vitamins, and protecting against pathogenic organisms. #### Streptococcus mutans (Option 1): - **Role in the Mouth:** This bacterium is part of the normal flora of the human oral cavity. It plays a significant role in the formation of dental plaque and can contribute to tooth decay by producing acids from dietary sugars. #### Escherichia coli (Option 2): - **Role in the Mouth:** Escherichia coli is typically found in the intestines and is a major component of the gut flora. It is not normally found in the mouth and is thus not considered part of the oral normal flora. #### Klebsiella pneumoniae (Option 3): - **Role in the Mouth:** Klebsiella pneumoniae is usually found in the gut and respiratory tract. It is not a normal inhabitant of the oral cavity and can cause infections if found there. #### Staphylococcus epidermidis (Option 4): - **Role in the Mouth:** This bacterium is commonly found on the skin and mucous membranes. It can be part of the oral flora but is more widely recognized for its presence on the skin and in the upper respiratory tract. **Correct Answer:** **1) Streptococcus mutans** This question helps in understanding the types of bacteria that constitute the normal flora of various parts of the body and their roles in health and disease. For further reading on this topic, consider the impact of these bacteria on oral health, the balance between beneficial and harmful microorganisms, and the implications for dental hygiene practices.
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