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Pill

Theme C - Interaction &  Interdependence

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Direct Hit

Theme A - Unity & diversity

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Page Facing Up

Theme B - Form & Function

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Keycap Digit One

Theme D - Continuity & Change

🚀 The Big Picture: Signalling molecules can have either localized effects (short distance) or distant effects (long distance) based on how far they are transported.

<ul>
	<li>Example: Neurotransmitters</li>
	<li>How do they work? 🤔
	<ul>
		<li>Released by presynaptic neurons.</li>
		<li>Travel a super-short distance (about 20 nanometres) to affect the one postsynaptic neuron.</li>
	</ul>
	</li>
	<li>Real-world example: 🌍
	<ul>
		<li>Think of a text message you send to your friend sitting right next to you. It&#39;s meant for them and them only!</li>
	</ul>
	</li>
</ul>

<ul>
	<li>Example: Hormones</li>
	<li>How do they work? 🤔
	<ul>
		<li>Produced by glands.</li>
		<li>Transported in the blood to different parts of the body.</li>
		<li>Can affect target cells that are quite far from where they are produced.</li>
	</ul>
	</li>
	<li>Notable Mention: Luteinizing hormone (LH)
	<ul>
		<li>Produced: In the pituitary gland near the brain.</li>
		<li>Targets
		<ul>
			<li>Males 🧑: Testes</li>
			<li>Females 👩: Ovaries</li>
		</ul>
		</li>
		<li>Despite being produced near the brain, it travels quite a distance to perform its function.</li>
	</ul>
	</li>
	<li>Real-world example: 🌍
	<ul>
		<li>Imagine sending a snail mail letter (yes, the old-school way!). You post it in your city and it reaches your friend in a city far, far away. It&#39;s kind of how hormones travel in the body &ndash; from their point of origin to a distant target.</li>
	</ul>
	</li>
</ul>

💡 Remember: Whether localized or distant, signalling molecules play a vital role in the body. Just like communication is essential in our daily lives, these molecules ensure the body&#39;s various parts talk to each other and work harmoniously.

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Happy studying and keep being curious! 🌱🔬📚

Explore Local & Distant Signalling Molecule Effects!

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Higher Level

Biology HL

Theme C - Interaction & Interdependence

Explore Local & Distant Signalling Molecule Effects!

Table of content

Localized effects of signalling molecules 🎯

Unlock the Full Content!

Theme C - Interaction & Interdependence

Explore Local & Distant Signalling Molecule Effects!

Table of content

Localized effects of signalling molecules 🎯

Unlock the Full Content!