Which brain defense restricts substances from entering the brain via the vascular system?

A. Blood-brain barrier
B. Cranium
C. Meninges
D. Microglia
E. Macrophages


Answer: A

Biology & Microbiology

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Homologous chromosomes have the same arrangement of genes along their length

A. true B. false

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Briefly explain why children born with severe combined immune deficiency (SCID) often do not experience infection for several months after birth

What will be an ideal response?

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A compound that dissociates in water to produce ________ is called a salt

A) hydrogen ions B) anions C) hydroxyl ions D) cations E) anions and cations

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Substances that cannot be broken down into other substances are called _________.

A. neutrons B. elements C. protons D. compounds

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