Les Definitions De Svt 2 Bac Pc Pdf May 2026

L'épreuve de SVT au baccalauréat (spécialement pour la filière PC) est un examen de précision. Souvent, les questions ne demandent pas de longues dissertations, mais des définitions exactes et des explications scientifiques rigoureuses.

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Definition: A chemical messenger (e.g., acetylcholine, dopamine) released by the presynaptic neuron into the synaptic cleft. Its role is to bind to receptors on the postsynaptic membrane to generate or inhibit a new action potential. les definitions de svt 2 bac pc pdf

Neurophysiology is often the first major unit in the 2 Bac PC curriculum. It deals with reflexes, sensations, and voluntary movements. Here are the non-negotiable definitions.

Definition: A fragment of the lithosphere that moves relative to other plates over the asthenosphere. Plate boundaries are zones of intense seismic and volcanic activity. L'épreuve de SVT au baccalauréat (spécialement pour la

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Definition: A minimal, stereotyped, and rapid neural pathway that underlies an involuntary reaction to a stimulus. It bypasses the conscious brain to ensure protection (e.g., withdrawing a hand from a flame).

Here are the key definitions organized by major themes: