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<h2 class="wp-block-heading" id="h-introduction">Introduction</h2>
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<p>Good afternoon, everyone!<br>My name is <strong>Francis BC</strong>, and in today’s tutorial, we will review <strong>biology past questions</strong> based on the <strong>circulatory system</strong>. These questions are drawn from examinations ranging from <strong>1978 to 2024</strong>, providing a rich mix of foundational and modern concepts. Our focus will be on understanding blood flow, heart structure, and key vessels involved in circulation.</p>
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<p>You can watch the full class in the video below:</p>
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https://www.youtube.com/watch?v=Q9B8ZZzez7o&t=285s
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<h2 class="wp-block-heading" id="h-question-1-sequence-of-blood-flow-from-heart-to-tissue">Question 1: Sequence of Blood Flow from Heart to Tissue</h2>
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<p><strong>Question:</strong><br>Which of the following describes the sequence of flow of blood from the heart to the tissue?</p>
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<h3 class="wp-block-heading" id="h-explanation">Explanation</h3>
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<p>Blood circulation involves the <strong>pumping of blood</strong> from the <strong>heart</strong> into various tissues through different blood vessels. The correct flow is:</p>
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<li><strong>A) Heart → Artery → Arteriole → Tissue</strong> (Correct)</li>
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<li><strong>B) Heart → Vein → Tissue</strong> (Veins carry blood back to the heart, not away.)</li>
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<li><strong>C) Heart → Venule → Tissue</strong> (Venules are small veins; they do not carry blood away from the heart.)</li>
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<li><strong>D) Heart → Atria → Tissue</strong> (Atria are chambers inside the heart; blood exits via arteries, not atria.)</li>
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<p><strong>Correct Answer:</strong> <strong>A</strong></p>
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<h2 class="wp-block-heading" id="h-question-2-structure-responsible-for-blood-pumping-in-mammals">Question 2: Structure Responsible for Blood Pumping in Mammals</h2>
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<p><strong>Question:</strong><br>What is the primary structure responsible for pumping blood in the mammalian circulatory system?</p>
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<h3 class="wp-block-heading" id="h-explanation-0">Explanation</h3>
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<p>The <strong>heart</strong> is the main pumping organ, and its <strong>left ventricle</strong> is specifically responsible for pumping oxygenated blood to the entire body through the <strong>aorta</strong>.</p>
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<li><strong>A) Upper auricle</strong> (Collects blood, does not pump it to the body.)</li>
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<li><strong>B) Arteries</strong> (Carry blood but do not generate pumping force.)</li>
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<li><strong>C) Left ventricle</strong> (Correct – pumps blood into systemic circulation.)</li>
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<li><strong>D) Veins</strong> (Return blood to the heart, no pumping action.)</li>
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<p><strong>Correct Answer:</strong> <strong>C – Left ventricle</strong></p>
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<h2 class="wp-block-heading" id="h-why-this-topic-is-important">Why This Topic Is Important</h2>
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<p>Understanding blood flow and heart anatomy is vital for mastering topics like:</p>
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<li><strong>Systemic and pulmonary circulation</strong></li>
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<li><strong>Arteries, veins, and capillaries functions</strong></li>
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<li><strong>Heart chambers (atria vs ventricles)</strong></li>
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<li><strong>Common exam questions on mammalian circulatory system</strong></li>
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<p><mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-cyan-blue-color"><strong>Watch more educational videos and past questions:</strong> </mark><a href="https://youtube.com/@allcbts">https://youtube.com/@allcbts</a></p>
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<h2 class="wp-block-heading" id="h-conclusion">Conclusion</h2>
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<p>In this tutorial, we explained <strong>how blood flows from the heart to tissues</strong> and identified the <strong>left ventricle</strong> as the key pumping structure in mammals. Mastering these concepts is essential for excelling in <strong>biology exams</strong> such as WAEC, NECO, and JAMB, as well as university-level courses.</p>
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<p><strong><mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-cyan-blue-color">Related Videos:</mark></strong></p>
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