Class 7 Name Date Nutrition in humans 7.1 The processes of...

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Class: Name: ( ) Date: 7 7 Nutrition in humans Nutrition in humans 7.1 The processes of human nutrition The mode of nutrition ( 營養 ) in humans involves five main processes: HKDSE BIOLOGY—Concepts and Applications Classroom Worksheet 7- 1 © Aristo Educational Press Ltd. The five main processes of nutrition in humans (4) ( 同化 ) The absorbed food molecules are used by body cells for metabolism . (3) ( 吸收 ) The digested, soluble food molecules enter the circulatory system from the digestive system. (5) ( 排遺 ) The undigested and unabsorbed materials are passed out from the body as faeces. (2) ( 消化 ) Complex food molecules are broken down into smaller , simpler soluble molecules. (1) ( 攝食 ) Food is taken in through the mouth.
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Class: Name: ( ) Date: 7.2 The human digestive system The human digestive system ( 消化系統 ) consists of the (1) ( 消化道 ) and its associated (2) ( ). HKDSE BIOLOGY—Concepts and Applications Classroom Worksheet 7- 2 © Aristo Educational Press Ltd. (11) ( ) (5) (4) (3) ( 口腔 ) small intestine ( 小腸 ) (12) ( 食道 ) (13) ( ) (14) ( ) (10) ( 唾腺 ) large intestine ( 大腸 ) (15) ( 結腸 ) caecum ( ) appendix ( 闌尾 ) rectum ( 直腸 ) (16) ( 肛門 ) The human digestive system (6) ( ) (9) ( 迴腸 ) (7) ( 膽囊 ) (8) ( 十二指 ) Practical 7.1 ( Book 1, Ch 7, p.5; SBA Practical Workbook 1, Ch 7, p.1–2) Go to…
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Class: Name: ( ) Date: 7.3 Ingestion The process of chewing and cutting solid food into small pieces by teeth is called (1) ( 咀嚼 ). A. Different types of teeth in humans There are four types of teeth in humans: Type of tooth Features Functions A (2) ( 門齒 ) Chisel-shaped With flat sharp edges With one root Biting and cutting food B (3) ( 犬齒 ) Pointed With one root Tearing food (especially flesh) C (4) ( 前臼齒 ) Broad top with two cusps With one or two roots Crushing and grinding food D (5) ( 臼齒 ) Larger than premolars Broad top with four cusps With two or three roots Crushing and grinding food HKDSE BIOLOGY—Concepts and Applications Classroom Worksheet 7- 3 © Aristo Educational Press Ltd. A B C D The four types of teeth on the lower jaw
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Class: Name: ( ) Date: HKDSE BIOLOGY—Concepts and Applications Classroom Worksheet 7- 4 © Aristo Educational Press Ltd.
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Class: Name: ( ) Date: B. The structure of a tooth Structure Features and functions Enamel The outermost , hardest layer covering the crown A non-living substance, made up mostly of (14) salts Protects the tooth from the wear of biting and chewing Cement Replaces enamel at the root of the tooth A thin layer of bone-like structure Fixes the tooth into the jaw bone through the (15) , which allows the tooth to move slightly and acts as a shock absorber Dentine The middle layer of a tooth A bone-like structure Contains cytoplasmic extensions of the cells in the pulp cavity Pulp cavity The innermost part of a tooth, containing living cells which produce dentine Contains (16) to detect temperature and pressure Contains (17) to supply oxygen and nutrients and remove waste products HKDSE BIOLOGY—Concepts and Applications
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