Year 10 - Science
The human heart and double circulatory system, including calculating cardiac output
Transport and exchange surfaces in humans
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers the human circulatory system, its link to the gas exchange system, and the adaptations of the heart, blood vessels, and blood components. It explains transport mechanisms like diffusion, osmosis, and active transport, and the need for exchange surfaces in multicellular organisms.
Lesson Summary
You will learn to describe the function and structure of the human heart, and the importance of having a double circulatory system.
Key Notes
- Substances are transported around the body in the blood, which is pumped through vessels by an organ called the heart.
- The heart is made of cardiac muscle, which continually contracts and relaxes to pump blood.
- The heart has four chambers with valves, which keep oxygenated and deoxygenated blood separate.
- Cardiac output can be calculated using: cardiac output = stroke volume × heart rate.
- We have a double circulatory system; blood is pumped to the lungs for gas exchange then around the rest of the body.
Vocabulary To Learn
- circulatory system: The system which transports nutrients and waste around the body.
- heart: An organ which pumps blood around the body.
- cardiac muscle: Specialised tissue found in the heart which rhythmically contracts and relaxes together.
- chamber: A section of the heart, known as an atrium or ventricle.
- valve: Flaps in the heart which prevent backflow of blood.
Common Mistakes To Avoid
- Confusion between the names and functions of the different parts of the heart and the direction that blood moves through the heart.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Substances are transported around the body in the blood, which is pumped through vessels by an organ called the heart. The heart is made of cardiac muscle, which continually contracts and relaxes to pump blood.
2. Define this scientific word and use it in context. 'circulatory system'
The system which transports nutrients and waste around the body. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Confusion between the names and functions of the different parts of the heart and the direction that blood moves through the heart. Correction: The parts of the heart and their structure and function are dealt with separately and clearly, and followed up with quick checks plus longer and more detailed tasks.
More Lessons In This Unit
- Diffusion and surface area to volume ratio Study Guide
- Diffusion and surface area to volume ratio, including Fick's law Study Guide
- Human blood cells and blood vessels Study Guide
- Microscopy of human blood cells and blood vessels Study Guide
- Moving into and out of the blood: diffusion, osmosis and active transport Study Guide
- The human circulatory system Study Guide
- The human heart and double circulatory system Study Guide
- The importance of exchange surfaces and transport systems in humans Study Guide
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