✔ The human brain contains approximately:
- 86 billion neurons (nerve cells)
- A roughly equal number of glial cells
👉 This brings the total to around:
- 170 billion brain cells
⚡ Neurons (Main Signaling Cells)
Neurons are the brain’s communication system.
They:
- Send electrical signals
- Send chemical signals
-
Allow us to:
- Think
- Feel
- Move
- Learn
- Remember
🔗 Synaptic Connections
Neurons are not isolated—they are connected.
👉 The brain has about:
- 100 trillion synaptic connections
A synapse is the tiny gap where neurons pass messages to each other.
✔ This is how information travels through the brain.
🧩 Glial Cells (More Than “Support”)
You’re right—this has changed in modern science.
Glial cells were once thought to only:
- Support neurons
- Hold the brain together
👉 Now we know they also:
- Help neurons communicate
- Protect brain cells
- Maintain brain health
- Support learning and memory
🧠 Example Type
-
Astrocytes (a type of glial cell)
- Help regulate the environment around neurons
- Support signaling
🔌 How Brain Cells Work Together
The brain works as a network:
- Neurons = wires sending signals
- Synapses = connection points
- Glial cells = support and regulation
👉 Together they create:
- Thoughts
- Emotions
- Behaviour
🔄 Neuroplasticity (Key Concept)
This is one of the most important ideas in modern psychology.
👉 Neuroplasticity means:
- The brain can change and adapt
✔ What This Means
- New connections can form
- Old connections can strengthen or weaken
-
The brain can reorganise after:
- Learning
- Injury
- Experience
🧠 Real-Life Examples
- Learning a new skill
- Recovering after brain injury
- Therapy changing thought patterns
🧠 Brain Structure and Function
Different parts of the brain do different jobs:
Cerebrum
- Thinking
- Memory
- Emotions
- Decision-making
Cerebellum
- Balance
- Coordination
- Movement
Brainstem
- Breathing
- Heart rate
- Survival functions
🧬 Comparing to Other Animals
This is where it gets interesting.
👉 Humans do NOT have the biggest brains overall.
But we do have:
- Very complex neural connections
- Highly developed cerebral cortex
🐾 Animals vs Humans
- Some animals have more neurons in certain areas
-
Humans have more neurons linked to:
- Thinking
- Language
- Planning
👉 This is why humans have advanced reasoning abilities.
🔗 Linking Back to Psychology
All of this connects directly to psychology.
Psychology studies:
- Thoughts
- Feelings
- Behaviour
👉 These all come from:
- Neurons firing
- Brain networks working together
- Experience shaping connections
📘 Easy Read Summary
🧠 The brain has about 170 billion cells
⚡ 86 billion are neurons (message cells)
🔗 Neurons connect through synapses
🧩 Glial cells help and support the brain
🔄 The brain can change (neuroplasticity)
💭 Thoughts and feelings come from brain activity
👥 Everyone’s brain is different because of experience
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