Answer:
B and C
Explanation:
The defense mechanisms that reduce the risk of infection in the oral cavity include:
B. Saliva, Enzymes: Saliva contains various antimicrobial components, such as lysozyme and lactoferrin, which help inhibit the growth of bacteria and other microorganisms. Saliva also helps to wash away food debris and microbes from the oral cavity.
C. Mucous membranes, Immune cells: The oral cavity is lined with mucous membranes that provide a physical barrier against invading pathogens. Additionally, immune cells present in the oral mucosa, such as macrophages and lymphocytes, help recognize and eliminate harmful microorganisms.
It's important to note that while antibiotics and vaccination can be important in preventing and treating infections, they are not specific to the oral cavity and are not considered as defense mechanisms within the oral cavity itself.
Therefore, the correct answer would be:
B. Saliva, Enzymes
C. Mucous membranes, Immune cells
