Скачать или смотреть Human Heart Structure & Function + Pulse Rate During Exercise Exam Question Explained A & O Level

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In this lesson, we solve and fully explain a structured exam question based on the human heart and changes in pulse rate during exercise, commonly asked in A Level & O Level Biology exams.

This video focuses on Question 1, including diagram labeling, functions of heart parts, and data interpretation related to a 5000-metre race.

❤️ Part 1: Human Heart Diagram & Blood Vessels (Question 1a)

The video explains a labeled diagram of the human heart and main blood vessels, including:

Heart Chambers

Right atrium

Right ventricle

Left atrium

Left ventricle

Major Blood Vessels

Aorta

Pulmonary artery

Pulmonary vein

Vena cava

Functions Explained

Movement of oxygenated and deoxygenated blood

Role of ventricles vs atria

Why the left ventricle has a thicker wall

Direction of blood flow through the heart

Function of valves in preventing backflow

Students learn how to match each structure with its function, exactly as required in Table-based exam questions.

🏃 Part 2: Pulse Rate During a 5000-Metre Race (Question 1b)

A group of students recorded the pulse rate of an athlete using a heart monitor before, during, and after a 5000 m race.

Explanation Includes:

Why pulse rate increases at the start of the race

Increased demand for oxygen and glucose

Role of respiration in releasing energy

Increased carbon dioxide removal

Effect of adrenaline on heart rate

Why pulse rate remains high during exercise

Why pulse rate gradually decreases after the race

Oxygen debt and recovery period

This section teaches students how to explain trends in data, a key skill for 6-mark structured questions.

🎯 Learning Outcomes

By the end of this lesson, students will be able to:

✔ Identify and describe heart structures and blood vessels
✔ Explain functions of each heart part clearly
✔ Interpret data from heart-rate monitors
✔ Explain changes in pulse rate during exercise and recovery
✔ Use correct biological terms in exam answers
✔ Score higher in structured and data-based questions

📌 Helpful For

✔ A Level Biology students
✔ O Level / IGCSE Biology students
✔ Exam-focused revision
✔ Understanding exercise physiology
✔ Practicing explanation-based questions

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