ALLCBTs

Biology Past Questions: Circulatory System.

Published on Jul 24, 2025 • Education

Introduction

Good afternoon, everyone!
My name is Francis BC, and in today’s tutorial, we will review biology past questions based on the circulatory system. These questions are drawn from examinations ranging from 1978 to 2024, 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.

You can watch the full class in the video below:

Question 1: Sequence of Blood Flow from Heart to Tissue

Question:
Which of the following describes the sequence of flow of blood from the heart to the tissue?

Explanation

Blood circulation involves the pumping of blood from the heart into various tissues through different blood vessels. The correct flow is:

• A) Heart → Artery → Arteriole → Tissue (Correct)
• B) Heart → Vein → Tissue (Veins carry blood back to the heart, not away.)
• C) Heart → Venule → Tissue (Venules are small veins; they do not carry blood away from the heart.)
• D) Heart → Atria → Tissue (Atria are chambers inside the heart; blood exits via arteries, not atria.)

Correct Answer: A

Question 2: Structure Responsible for Blood Pumping in Mammals

Question:
What is the primary structure responsible for pumping blood in the mammalian circulatory system?

Explanation

The heart is the main pumping organ, and its left ventricle is specifically responsible for pumping oxygenated blood to the entire body through the aorta.

• A) Upper auricle (Collects blood, does not pump it to the body.)
• B) Arteries (Carry blood but do not generate pumping force.)
• C) Left ventricle (Correct – pumps blood into systemic circulation.)
• D) Veins (Return blood to the heart, no pumping action.)

Correct Answer: C – Left ventricle

Why This Topic Is Important

Understanding blood flow and heart anatomy is vital for mastering topics like:

• Systemic and pulmonary circulation
• Arteries, veins, and capillaries functions
• Heart chambers (atria vs ventricles)
• Common exam questions on mammalian circulatory system

Watch more educational videos and past questions: https://youtube.com/@allcbts

Conclusion

In this tutorial, we explained how blood flows from the heart to tissues and identified the left ventricle as the key pumping structure in mammals. Mastering these concepts is essential for excelling in biology exams such as WAEC, NECO, and JAMB, as well as university-level courses.

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