Which of the following make up the body's first line of defense?

a. Surface barriers

b. Cells and proteins of adaptive immunity

c. Cells and proteins of innate immunity

d. All of the above

Video transcript

Hey, everyone. Let's take a look at this question together which of the following is considered as the first barrier of the body against pathogens. Is it answer choice. A the mucous membranes. Answer choice B neutrophils. Answer choice C the blood brain barrier or answer choice D dendritic cells. Let's work this problem out together to try to figure out which of the following answer choices is that first barrier of the body that protects against pathogens. So in order to solve this question, we have to recall what we have learned about the different barriers of the body and recall what that first barrier of the body is that protects the body against pathogens. And we know that the first barrier of the body that is the first defense against those pathogens is the closed skin surface and all mucous membranes which that close skin surface and all mucous membranes forms a physical protective barrier against pathogens. So answer choice. A mucous membranes is the correct answer. And all other answer choices are incorrect since neutrophils blood brain barrier and dendritic cells are not that first barrier of the body that protects it against pathogens, which is answer choice A, I hope you found this video to be helpful. Thank you and goodbye.