<h2><strong>Muscle Tissue</strong></h2>
<p>There are three types of muscle tissue:</p>
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<ol>
<li>Skeletal</li>
<li>Smooth</li>
<li>Cardiac</li>
</ol>
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<p>Skeletal and <a data-lesson="muscles" data-subject="biology" data-tutorial="human-biology" href="https://app.ulearngo.com/biology/human-biology/muscles">cardiac muscle</a> are striated. Striated muscle cells are striped, with regular patterns of <a data-lesson="proteins-2" data-subject="biology" data-tutorial="biology-foundations" href="https://app.ulearngo.com/biology/biology-foundations/proteins-2">proteins</a> responsible for contraction. Striated muscle contracts and relaxes in short bursts, whereas <a data-lesson="muscles" data-subject="biology" data-tutorial="human-biology" href="https://app.ulearngo.com/biology/human-biology/muscles">smooth muscle</a> contracts for longer.</p>
<p><em>1. Skeletal muscle</em> is a voluntary muscle. It is striated in appearance. Skeletal muscle tissue has regularly arranged bundles. It is anchored by <a data-lesson="tendons-and-ligaments" data-subject="biology" data-tutorial="animal-systems-intro" href="https://app.ulearngo.com/biology/animal-systems-intro/tendons-and-ligaments">tendons</a> and is used to effect skeletal muscle movement such as <em>locomotion</em> and maintain posture. The <a data-lesson="muscles" data-subject="biology" data-tutorial="human-biology" href="https://app.ulearngo.com/biology/human-biology/muscles">muscles</a> have a reflex action but can also respond to conscious control.</p>
<div class="wp-caption alignnone" style="width: 306px"><img alt="Image" height="230" src="https://data.ulearngo.com/assets/4082883b-d10f-4739-ba7b-9dbf3c3cfe58" width="306"/><p class="wp-caption-text">Skeletal muscle tissue</p></div>
<p><em>2. Cardiac muscle</em> is the major tissue making up the heart. It is an involuntary muscle that is striated in appearance. However, unlike skeletal muscle, cardiac muscle connects at branching, irregular angles. The connected branches help with coordinated contractions of the heart.</p>
<div class="wp-caption alignnone" style="width: 306px"><img alt="Image" height="245" src="https://data.ulearngo.com/assets/9c5eb3a1-bb3d-40c9-9a18-fdc6d365d5e2" width="306"/><p class="wp-caption-text">Cardiac muscle.</p></div>
<p><em>3. Smooth muscle</em> is an involuntary, non-striated muscle with tapered ends. It is found within the walls of <a data-lesson="blood-2" data-subject="biology" data-tutorial="human-biology" href="https://app.ulearngo.com/biology/human-biology/blood-2">blood</a> vessels such as arteries and veins. Smooth muscle is also found in the digestive system, urinary tract and in the trachea. It is responsible for involuntary rhythmic contractions of peristalsis required for moving food down the alimentary canal, and for the dilation and construction of <a data-lesson="blood-vessels-2" data-subject="biology" data-tutorial="human-biology" href="https://app.ulearngo.com/biology/human-biology/blood-vessels-2">blood vessels</a> to control blood pressure.</p>
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<table>
<tbody>
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<td><b>Diagram</b></td>
<td><b>Micrograph</b></td>
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<td>
<div class="wp-caption alignnone" style="width: 306px"><img alt="Image" height="186" src="https://data.ulearngo.com/assets/0defdedb-d520-4bb2-be39-d0306a53b73c" width="306"/><p class="wp-caption-text">Smooth muscle cells.</p></div>
</td>
<td>
<div class="wp-caption alignnone" style="width: 306px"><img alt="Image" height="302" src="https://data.ulearngo.com/assets/699db8c3-d18c-4a5d-9876-adb0dd85277e" width="306"/><p class="wp-caption-text">Smooth muscle cells.</p></div>
</td>
</tr>
</tbody>
</table>
</div>

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Muscle Tissue

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Muscle Tissue

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