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18 results for “blood brain barrier”
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🧠 The Brain’s Guarded Border: How the Blood-Brain Barrier Protects Us and Complicates Treatment
From section: 🧱 The barrier is built into the brain’s smallest vesselsThe blood-brain barrier is not a membrane wrapped around the brain. Most of it is formed by the endothelial cells that line microscopic blood vessels within the brain and spinal cord. …
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🧠 Where Awareness Takes Shape: Synapses, Brain Networks, and Consciousness
From section: 🌙 What changing states revealBrain injury poses a different and more complicated question. Tissue and pathways may be physically damaged, while other circuits may remain in place but communicate poorly as blood flow, metabolism, or signaling changes. …
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🧠 The Neural Symphony: How Neurons, Glia, and Networks Shape Human Experience
From section: ⚡ The language of neural communication… Astrocytes, star-shaped glial cells, help regulate the chemical environment around synapses. They clear neurotransmitters, buffer ions such as potassium, support neuronal metabolism, and participate in neurovascular coupling, helping match local blood flow and energy supply to neural activity. …
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🦟 Beyond the Bite: How Dengue Fever Affects the Body
From section: 💡 Did you know?🧱 Blood-vessel barriers differ across the body. In the brain, tightly joined endothelial cells and controlled transport help form the blood-brain barrier, a particularly selective interface. …
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🦠 Listening to the Hidden City Within: Understanding the Gut Microbiome
From section: 🧠 The gut–brain conversation: signals across the body… Much of the body’s serotonin is produced outside the central nervous system, particularly by enterochromaffin cells in the intestine, and this peripheral serotonin does not freely cross the blood-brain barrier. …
- The Perpetually Curious! › Canonical › Biology & HealthArticle
☕ The Molecular Democracy: Why Coffee Affects People Differently
From section: ☕ The difference can begin inside the cup… Once swallowed, caffeine is absorbed through the digestive tract and enters the circulation. It readily crosses the blood-brain barrier, reaching the nervous system where its best-known effects begin. Arrival is only the first part of the story. …
- The Perpetually Curious! › Canonical › Biology & HealthArticle
😮💨 When A Breath Becomes a Yawn: Why We Yawn and What This Quiet Reflex May Reveal
From section: ❄️ Cooling the brain and adjusting arousalSome studies have reported that yawning occurs more often when brain or head temperature rises and may decrease after cooling. …
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🌙 Night Voices: The Quiet Science of Snoring and the Hidden Life of Sleep
From section: 🌙 Snoring as a window into sleep: The quiet complexity beneath a familiar soundThis nightly choreography also relates to the movement of cerebrospinal fluid, which flows through the brain in patterns shaped by slow waves in neural activity, blood oxygenation, and sleep depth.
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🌿 Why We Stretch When We Wake: The Quiet Reflex that Resets the Body
From section: Frequently Asked Questions+Why does stretching when waking often feel pleasant? The pleasant sensation may arise from increased blood flow, renewed sensory input, and the recalibration of proprioceptive pathways. Preliminary research suggests that neurotransmitters may contribute to this feeling, although the details are still being studied.
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🌡️ When the Skin Remembers the Cold: Why We Get Goosebumps
From section: ⚡ The Sympathetic Nervous System and the Pilomotor Reflex… In older or more formal medical language, it is also known as horripilation. It is controlled by the sympathetic branch of the autonomic nervous system, which also regulates heart rate, blood vessel diameter, and many other involuntary processes.