Transportation in human beings
Transportation in human beings is the movement of substances like oxygen, nutrients, hormones, and wastes through the blood and lymph.
Practice This ConceptMain explanation
Teacher explanation
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.
Simple analogy
Blood is the body's delivery and return system.
Common confusion
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.
Answer writing and exam use
1-mark use
Write the exact meaning of transportation in human beings in one clean line.
2-mark use
Define transportation in human beings and add one example or condition.
3-mark use
Explain transportation in human beings, show the method or example, and mention the common mistake.
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