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Biology topic 2 (digestive system (bile (produced in liver, released via.…
Biology topic 2
digestive system
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mouth - food chewed, ground, enzymes in saliva
stomach - churns up food, HCl made to kill bacteria (pH 1-2)
small intestine - absorbs nutrients (respiration, amino acids) - villi
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villi
large SA, absorbe food molecules fast
1 cell thick wall, hort diffusion path
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enzymes
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amylase
salivary gland, small intestine pancreas
to mouth, small intestine
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protease
stomach, pancreas, small intestine
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lipase
pancreas, small intestine
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plant diseases
plants need: right temp., correct CO2 conc., water, light, potassium, phosphates, O2, nitrates + space
detection: tumours, discolouration, stunted, malformed, pests, leaf spots, decay, discolouration
identification: gardening manual, monoclonal antibodies, lab
viruses (TMV), bacteria + fungae (rose black spot) can affect plants
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cells, tissues, organs and organ systems
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organs
group of similar tisues for function, work together - adapted
i.e. stomach - epithelial, glandular, muscular
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organ systems
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i.e - digestive, circulatory, endocrine
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proteins and enzymes
proteins
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specific shape, other molectles fit inside
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ezymes
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large proteins, shape vital for fuction
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active site, substrate fits inside
break down molecules, change one molecule into another
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plant tissues and organs
tissues
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spongey mesophyll - air spaces, high SA for diffusion
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organs
made from tissues, functions
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form orgam systems, transport substances