Which structure protects the brain from harmful substances traveling in the blood?

a. the cerebrospinal fluid
b. the cerebellum
c. the blood-brain barrier
d. the ventricles
e. the meninges


C

Biology & Microbiology

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Unsaturated fats are considered healthier than saturated fats in the human diet

Indicate whether the statement is true or false.

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Which classification level would be the most specific?

a. genus b. family c. phylum d. order e. class

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Creutzfeldt-Jakob disease is caused by a

A) bacterium. B) prion. C) virus. D) viroid. E) fungus.

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Which substance can enter a cell by diffusion without having to be digested?

A. water B. protein C. starch D. fat

Biology & Microbiology