When performing an assessment of the central nervous system, which concept should the nurse keep in mind?
A) White matter uses 94% of the cerebral oxygen.
B) Gray matter uses only 6% of cerebral oxygen.
C) The brain receives about 15% of the cardiac output.
D) The brain weighs 25% of total body mass.
C) The brain receives about 15% of the cardiac output.
Explanation: A) Although the brain weighs only 2.5% of total body mass, it receives approximately 15% of cardiac output, which is used to supply adequate oxygen and nutrients to cells of the CNS. Although the white matter of the CNS makes up 60% of brain mass, it uses only 6% of cerebral oxygen, whereas the gray matter of the brain utilizes 94% of cerebral oxygen, owing to its high metabolic demand.
B) Although the brain weighs only 2.5% of total body mass, it receives approximately 15% of cardiac output, which is used to supply adequate oxygen and nutrients to cells of the CNS. Although the white matter of the CNS makes up 60% of brain mass, it uses only 6% of cerebral oxygen, whereas the gray matter of the brain utilizes 94% of cerebral oxygen, owing to its high metabolic demand.
C) Although the brain weighs only 2.5% of total body mass, it receives approximately 15% of cardiac output, which is used to supply adequate oxygen and nutrients to cells of the CNS. Although the white matter of the CNS makes up 60% of brain mass, it uses only 6% of cerebral oxygen, whereas the gray matter of the brain utilizes 94% of cerebral oxygen, owing to its high metabolic demand.
D) Although the brain weighs only 2.5% of total body mass, it receives approximately 15% of cardiac output, which is used to supply adequate oxygen and nutrients to cells of the CNS. Although the white matter of the CNS makes up 60% of brain mass, it uses only 6% of cerebral oxygen, whereas the gray matter of the brain utilizes 94% of cerebral oxygen, owing to its high metabolic demand.
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