pill.png

Pill

Theme C - Interaction &  Interdependence

direct-hit.png

Direct Hit

Theme A - Unity & Diversity

page-facing-up.png

Page Facing Up

Theme B - Form & Function

keycap-digit-one.png

Keycap Digit One

Theme D - Continuity & Change

<ul>
	<li>Think of nerves like highways made up of tons of car lanes (nerve fibres). But instead of cars, these lanes are packed with information zooming around!</li>
	<li>Definition: A nerve is like a bundle or collection of nerve fibres. It&#39;s wrapped up in a protective coat (like a jacket!).</li>
</ul>

<ul>
	<li>Fun Fact: The sciatic nerve is like the highway with the most lanes! It&#39;s the thickest and can be about 20mm across. That&#39;s wider than most candy canes!</li>
	<li>The Optic Nerve is a superstar with between 770,000 and 1.7 million nerve fibres! It&rsquo;s like a mega city&#39;s worth of information highways.</li>
	<li>On the other hand, some smaller nerves might only have fewer than 100 fibres, like tiny countryside roads.</li>
</ul>

<ul>
	<li>Both Directions: Most nerves are like two-way highways. They have
	<ul>
		<li>Sensory Neurons (These are like cars sending information from our surroundings to our brain. Imagine tasting a pizza and immediately knowing it&#39;s spicy! 🍕)</li>
		<li>Motor Neurons (These are the cars taking commands from our brain to our muscles. Like telling our hand to lift a water bottle. 💪)</li>
	</ul>
	</li>
	<li>One Way Roads
	<ul>
		<li>Sensory Only: Some nerves only carry sensory information (like the optic nerve). This is like a highway just for cars telling our brain what we&rsquo;re seeing! 👀</li>
		<li>Motor Only: Others, like the oculomotor nerve, are only for motor messages. Imagine this like the express route that tells our eyes where to look.</li>
	</ul>
	</li>
</ul>

Every single organ in our body has its own set of nerve connections, like cities connected by roads and highways. So, whether it&#39;s your heart or your little pinky toe, they&#39;ve got their own special nerve links!

&nbsp;

🍀 Real-world Analogy: Imagine our body as a big bustling city (like New York or Tokyo). Nerves are the roads connecting different parts of the city. The bigger roads (like the sciatic nerve) connect major parts, while smaller ones might just lead to a single house. Traffic on these roads can be one-way (just sensory or just motor) or two-way (both sensory and motor).

&nbsp;

Remember, keep these fun facts in mind next time you&rsquo;re moving about or sensing anything. Our body&#39;s internal highway system is always at work! 🛣️🚗💨🧠

Explore The Intricate World Of Nerves!

ib-standard-level.webp

Standard Level

Biology SL

Theme C - Interaction & Interdependence

Explore The Intricate World Of Nerves!

Table of content

What is a nerve? 🧠

Size matters 📏

Unlock the Full Content!

Theme C - Interaction & Interdependence

Explore The Intricate World Of Nerves!

Table of content

What is a nerve? 🧠

Size matters 📏

Unlock the Full Content!