Definition

1. Adjective:
   • Capable of causing excitation or stimulation: "Excitatory" describes something, especially a substance or agent, that has the ability to excite, arouse, or stimulate activity, typically in a physiological, neural, or biochemical context.

Usage

The adjective "excitatory" is primarily used in scientific, medical, and technical contexts. It modifies nouns to indicate that the thing described has a stimulating or activating effect, particularly on nerve cells (neurons), muscles, or biological systems.

Examples

• Adjective:
  • Glutamate is the primary excitatory neurotransmitter in the central nervous system.
  • The drug has an excitatory effect on the heart muscle, increasing its rate of contraction.
  • Certain chemicals in the brain have excitatory functions, while others are inhibitory.

Advanced Usage

• "excitatory postsynaptic potential (EPSP)": A technical term in neuroscience referring to a temporary depolarization of a postsynaptic membrane caused by the flow of positively charged ions into the postsynaptic cell, making it more likely to fire an action potential.
  • The summation of multiple excitatory postsynaptic potentials can trigger a nerve impulse.

Variants and Related Words

• Excite (verb): To stir up or stimulate feelings, activity, or a physiological response.
  • The announcement will excite the fans.
• Excitation (noun): The act of exciting or the state of being excited; often refers to the stimulation of an organism, cell, or physical system.
  • Neural excitation is a key process in signal transmission.
• Excitant (noun/adjective): (As a noun) A stimulant. (As an adjective) Stimulating.
  • Caffeine is a well-known excitant.

Synonyms

• Stimulatory: Tending to stimulate or excite.
• Stimulating: Encouraging or arousing interest or enthusiasm; causing activation.
• Analeptic (medical): A restorative or stimulative drug, especially one used to restore consciousness.

Antonyms

• Inhibitory: Tending to restrain, prevent, or slow down activity.
• Depressant: A substance that reduces functional or nervous activity.
• Sedative: Promoting calm or inducing sleep.

Adjective

1. (of drugs e.g.) able to excite or stimulate