medium importancemedium difficulty5 min

Transportation in human beings

Transportation in human beings is the movement of substances like oxygen, nutrients, hormones, and wastes through the blood and lymph.

In one line: Blood is the body's delivery and return system.

Practice This Concept

Understand it

Multicellular organisms need an internal transport system because many cells are far from the body surface. Blood carries useful substances to cells and carries wastes away. The heart pumps blood, and blood vessels distribute it throughout the body.

Example

After eating, nutrients are carried in blood to body cells, and carbon dioxide is carried back to the lungs.

Rule to remember

Rule: Diffusion alone is too slow for the needs of a large multicellular body; a transport system is needed.

See it worked out

Follow the example line by line, then use the same method on new questions.

Worked example

After lunch, digested glucose enters blood in the intestine and is then carried to arm and leg cells so they can respire and work.

Method you can reuse

1Identify what must be transported.
2Name the pump and tubes.
3State why transport is needed in large bodies.
4Give a real example.
5Add waste removal.

Sketch it in your answer

Use a labelled route: heart → arteries → capillaries → veins → heart, with arrows for oxygen and waste.

Check yourself

Answer the question in your head before opening the answer.

Try it yourself

Why do large organisms need a transport system?

Think first, then show answer

Large organisms need a transport system because many cells are far from the body surface, so substances like oxygen, food, hormones, and wastes must be moved efficiently.

Common wrong answer

Only oxygen is transported in blood.

Why it loses marks: Blood also carries nutrients, carbon dioxide, hormones, and wastes.

Don't mix this up

Students think blood only carries oxygen, but it transports many substances.

Exam tip

In answers, mention the heart, blood vessels, and the different substances carried.

Write it in the exam

Each point is worth about one mark. Write point 1 for a 1-mark question and keep adding points as the marks go up.

How CBSE asks it

Explain the need for transport, describe the role of blood, or trace the movement of materials in the body.

1
Enough for 1 mark
Transportation in human beings is the movement of substances like oxygen, nutrients, hormones, and wastes through the blood and lymph.
2
Add for 2 marks
Example: After eating, nutrients are carried in blood to body cells, and carbon dioxide is carried back to the lungs.
3
Add for 3 marks
Multicellular organisms need an internal transport system because many cells are far from the body surface.

MCQ Quiz

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