Public educational draft · 04 November 2026Clinical review pending →

Reading journey

A brain signal has a journey of its own.

Connect neuropeptides, the blood–brain barrier, signaling and how cognition is measured.

  1. 01
    Brain & neuropeptides · 2 min read

    What Are Neuropeptides?

    Neuropeptides are chains of amino acids that participate in communication within the nervous system. They help influence processes such as pain, appetite, stress responses and social…

  2. 02
    Brain & neuropeptides · 2 min read

    How Do Neurotransmitters Differ From Neuropeptides?

    The categories overlap. Neuropeptides can function as neurotransmitters, so the clearest comparison is between small-molecule neurotransmitters and peptide transmitters. Both help cells…

  3. 03
    Brain & neuropeptides · 2 min read

    What Is the Blood–Brain Barrier?

    The blood–brain barrier is a specialized interface that regulates movement between the bloodstream and brain tissue. It is not a separate wall around the brain. Its key physical features…

  4. 04
    Brain & neuropeptides · 2 min read

    Can Peptides Cross the Blood–Brain Barrier?

    Some peptides can reach the brain from the circulation under particular conditions, while many cross poorly. There is no reliable rule that all small peptides cross or that all peptides are…

  5. 05
    Brain & neuropeptides · 2 min read

    What Is Neuroplasticity?

    Neuroplasticity is the nervous system’s capacity to change its structure or function in response to activity, experience, development or injury. It includes several processes, from changes…

  6. 06
    Brain & neuropeptides · 2 min read

    How Do Researchers Measure Cognitive Function?

    Cognitive function includes several abilities, such as attention, memory, language, processing speed and executive function. There is no single test that captures every aspect of thinking.…

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