Null Can Be Used

question 31

Multiple Choice

null can be used:

• A)to indicate a variable has no real value
• B)in a Boolean expression with ==
• C)as a placeholder
• D)all of the above

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Definitions:

Stimulation

The activity of promoting or encouraging a physical or biological response through external or internal factors.

All-or-none

A principle stating that the strength of a response of a nerve cell or muscle fiber is not dependent on the strength of the stimulus. If a stimulus is above a certain threshold, a nerve or muscle fiber will fire.

Acetylcholine Agonist

A substance that mimics the action of acetylcholine, a neurotransmitter involved in memory and muscle contraction.

Acetylcholine

A neurotransmitter involved in many functions, including muscle movement, heart rate, memory, and learning.