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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

<ul>
	<li>Location: Wall of the right atrium of the heart.</li>
	<li>Role: Think of the SAN like a DJ at a party. It sets the rhythm, but instead of beats, it controls your heartbeats!</li>
</ul>

<ul>
	<li>Location: Deep in your brain&#39;s medulla oblongata (a cool-sounding place, right?).</li>
	<li>Works like: A control center for your heart&#39;s pace, sending signals via two main nerves.</li>
</ul>

<ul>
	<li>
	Sympathetic Nerve: It&#39;s the accelerator pedal!

	<ul>
		<li>What it does: Makes the heart race faster.</li>
		<li>For example: In fit young people, it can turbo-boost the heart rate to 3 times its chill, resting rate.</li>
	</ul>
	</li>
	<li>
	Vagus Nerve: It&#39;s the brake pedal!

	<ul>
		<li>What it does: Tells the heart, &quot;Hey, slow down there, buddy!&quot;</li>
	</ul>
	</li>
</ul>

Real-World Analogy: Imagine driving a car. The sympathetic nerve is like stepping on the gas, while the vagus nerve is like tapping the brake.

<ul>
	<li>
	Baroreceptors: Blood pressure detectives!

	<ul>
		<li>Location: Walls of the aorta and carotid arteries.</li>
		<li>Function: They keep an eye on blood pressure and use negative feedback to control it.
		<ul>
			<li>Low pressure? They tell the heart to speed up.</li>
			<li>High pressure? They tell the heart to relax and slow down.</li>
		</ul>
		</li>
	</ul>
	</li>
	<li>
	Chemoreceptors: Chemical balance guardians!

	<ul>
		<li>Location: Again, aorta and carotid arteries.</li>
		<li>Types
		<ul>
			<li>Some check on oxygen levels in the blood.</li>
			<li>Others look at pH, which changes with carbon dioxide levels.</li>
		</ul>
		</li>
		<li>Negative feedback in action
		<ul>
			<li>Low oxygen or low pH? &quot;Hurry up, heart!&quot;</li>
			<li>High oxygen or high pH? &quot;Chill out, heart!&quot;</li>
		</ul>
		</li>
	</ul>
	</li>
</ul>

<ul>
	<li>Trigger: When something scary or urgent happens (like seeing a lion or trying to catch a bus!), the amygdala (part of your brain) shouts &quot;Alert!&quot;</li>
	<li>Result: The hypothalamus (another brain part) tells the adrenal gland to release epinephrine, which makes your heart race, even if the usual feedback mechanisms are saying otherwise.</li>
</ul>

Real-World Example: Imagine you&#39;re playing a video game and a big boss suddenly appears. Your adrenaline (epinephrine) spikes, preparing you for that epic battle! In real life, this boost helps you react quickly to threats.

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🌟 Remember: Your heart doesn&#39;t just beat randomly. It listens to a symphony of signals, responding accordingly to keep you running, dancing, and living life to the fullest! 🌟

Theme C - Interaction & Interdependence

Unlock Heart Rate Control Baroreceptors & Chemoreceptors

Table of content

The Heart's Natural Pacemaker - The Sinoatrial Node (SAN) 🎵

Signals from the Brain - The Cardiovascular Centre 🧠

Two Nerves, Two Actions 🚗