Which of the following statements correctly describes the role of the hair that lines the external nares (nostrils)?
A) Hair in the nostrils enhances the sense of smell.
B) Hairs of the nostrils facilitate the flow of particles into the nasal cavity.
C) The hair that lines the nostrils filters foreign particles, preventing entry into the nasal cavity.
D) The hair has no known function.
C
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Your patient has a normal helper T cell count, but very little helper T cell activity. Which of the following scenarios may explain this observation?
A. She is HIV positive. B. She has a mutation in her MHC II proteins making them ineffective. C. She has a mutation in the gene for perforin and makes an ineffective version of this molecule. D. She has low antibody activity. E. None of these answers would explain the observations seen in this patient.
A high sodium load in the ECF will lead to a/an ____ in plasma volume and a/an ____ in blood pressure
a. increase, decrease b. decrease, decrease c. decrease, increase d. increase, increase e. none of these.
Red pulp and white pulp are characteristic of which lymphoid organ?
A) Lymph node B) Tonsil C) Thymus D) Spleen
The _____________ bases in DNA are adenine, cytosine, guanine and thymine.
Fill in the blank(s) with the appropriate word(s).