Chapter 5 · Question 14
What are the components of the transport system in human beings? What are the functions of these components?
Q14
What are the components of the transport system in human beings? What are the functions of these components?
Answer Revealed
Direct Answer:
The human transport system consists of the heart (pumping organ), blood vessels (arteries, veins, capillaries), and blood (fluid medium carrying cells, nutrients, gases, and wastes).
Simple Explanation
Our transport system has three main parts: the heart pumps blood, blood vessels are tubes that carry blood everywhere, and blood is the fluid that carries oxygen, food, and waste around the body.
Exam-Ready Structure
The transport system (circulatory system) in human beings consists of: 1. Heart — A muscular pumping organ with four chambers (two atria and two ventricles). It pumps deoxygenated blood to the lungs and oxygenated blood to the rest of the body. Valves inside the heart prevent backflow of blood. 2. Blood vessels — Arteries carry blood away from the heart (thick, elastic walls, no valves). Veins carry blood towards the heart (thin walls, have valves to prevent backflow). Capillaries are extremely thin-walled vessels where exchange of materials occurs between blood and tissues. 3. Blood — A fluid connective tissue consisting of plasma (carries dissolved nutrients, hormones, and waste), red blood cells (carry oxygen via haemoglobin), white blood cells (defence), and platelets (blood clotting).
Key Points
- Heart pumps blood and has four chambers
- Arteries carry blood away from the heart
- Veins carry blood towards the heart; have valves
- Blood transports gases, nutrients, and wastes
Common Mistakes
- Saying arteries carry oxygenated blood (pulmonary artery carries deoxygenated blood)
- Saying all veins have valves
Relevant Maps and Figures
Schematic Sectional View of the Human Heart
figure
Use the heart figure to identify the pumping chambers and the major vessels in one place.
This is the clearest visual for matching atria, ventricles, arteries, veins, and valves.
This heart figure helps answer both the chamber-function question and why oxygenated and deoxygenated blood must remain separated in mammals and birds.
Answer Sources
- Figure 5.10 human heart and vesselsfigure | Science | Life Processes | Components of the circulatory system | Pages 14-15