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True / False. The heart
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Are these sentences true or false? The heart is the organ that pumps blood to all the cells in our body. The heart is about the size of a football. The walls of the heart are made of muscle tissue. The…
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The removal of cell waste
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4.1. What does excretion consist of? Cell activity produces waste products like carbon dioxide or urea. These substances are toxic for the organism if they accumulate. The function of excretion is…
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Introduction - The Earth, a Living Planet
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The existence of water and a protective atmosphere were key elements for the appearance of life on Earth. The first cells appeared 3.5 billion years ago. From these early forms of life, different groups…
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Complete. The bloodstream
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Complete this text with the correct words: In pulmonary circulation, blood passes from the right ventricle to the lungs through the artery. In the lungs, the blood expels carbon dioxide and collects .…
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Natural Science
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Unit 6: Living things bacteria (n): a tiny unicellular organism. cell (n): the smallest living component that makes up a living thing. feed (v): to obtain food and nourishment. grow (n): to increase in…
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Self-assessment T8 04 - Nutrition, breathing and circulation
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Complete this text with the correct words: The respiratory system is the group of through which we are able to inhale , and exhale . It consists of the and the lungs. The respiratory tract connects the…
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A microscope
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A microscope is an instrument that magnifies very small objects, like cells, so that we can observe and study them. The main part of this instrument is a metal tube with a lens at each end: the eyepiece…
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Unit 8: The Earth, a Living Planet
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Asexual reproduction (n): the process of reproduction of a single organism by itself. autotroph (n): an organism that produces its own food for nutrition. bioelement (n): any of the chemical elements…
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The senses - The senses
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We receive information on what is happening outside our body through our sensory receptors. These receptors are specialised nerve cells that capture stimuli from outside our body. There are different…
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