During Paradoxical Sleep

question 17

Multiple Choice

During paradoxical sleep,

• A) brain neurotransmitter activity in the pathways regulating states of consciousness is similar to that in the awake state.
• B) brain oxygen consumption is lower than when awake.
• C) skeletal muscle tension is dramatically increased.
• D) the person is easily aroused.
• E) All of the choices occur.

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Definitions:

Absolute Dating

A method of determining the age of an object or material, often by measuring the decay of radioisotopes.

Radioisotopes

Isotopes of elements that are radioactive, undergoing decay and emitting radiation in the process.

Fossil

Any past evidence of an organism that has been preserved in the Earth’s crust.