Fig. 7.1 is a diagram of the human digestive system. Fig. 7.1 State the letter in Fig. 7.1 that identifies: the gall bladder ........................ the organ that secretes salivary amylase ........................ where egestion occurs ........................ where most absorption occurs ........................ where physical digestion occurs ........................ where the pH is acidic. ........................

Biology

IGCSE&ALevel

CAIE

Exam No：0610_s24_qp_31 Year：2024 Question No：7(a)

Answer:

Knowledge points:

7.2.1 Define ingestion as the taking of substances, e.g.

7.2.10 Describe cholera as a disease caused by a bacterium

7.2.11 Identify the main regions of the alimentary canal and associated organs, limited to mouth, salivary glands, oesophagus, stomach, small intestine (duodenum and ileum), pancreas, liver, gall bladder and large intestine (colon, rectum, anus)

7.2.12 Describe the functions of the regions of the alimentary canal listed above, in relation to ingestion, digestion, absorption, assimilation and egestion of food

7.2.13 Explain that the cholera bacterium produces a toxin that causes secretion of chloride ions into the small intestine, causing osmotic movement of water into the gut, causing diarrhoea, dehydration and loss of salts from blood

7.2.2 food and drink, into the body through the mouth

7.2.3 Define mechanical digestion as the breakdown of food into smaller pieces without chemical change to the food molecules

7.2.4 Define chemical digestion as the breakdown of large, insoluble molecules into small, soluble molecules

7.2.5 Define absorption as the movement of small food molecules and ions through the wall of the intestine into the blood

7.2.6 Define assimilation as the movement of digested food molecules into the cells of the body where they are used, becoming part of the cells

7.2.7 Define egestion as the passing out of food that has not been digested or absorbed, as faeces, through the anus

Answer:

Knowledge points:

Solution:

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