Life Processes What are the characteristics of life?
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Transcript of Life Processes What are the characteristics of life?
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Life Processes
What are the characteristics of life?
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LIFE PROCESSES
Looking at living thingsLooking at living things
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What is a living thing?
• Imagine that you are space traveler who lands on an unknown planet. How could you determine if what you are looking at is alive. Ex. A rock and a blade of grass.
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What are the life processes?
• NUTRITION• TRANSPORT• RESPIRATION• EXCRETION• SYNTHESIS• GROWTH• REGULATION• REPRODUCTION
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Key Concepts
• Metabolism – all the chemical activities an organism must carry on to sustain life.
• Homeostasis – the maintenance of a stable internal environment in spite of changes in the external environment.
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Nutrition
• Includes the activities involved in ingestion (obtaining food from the environment) and digestion (processing food for use by the organism). It also includes egestion (removal of solid wastes)
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Nutrition - Ingestion
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Nutrition - Digestion
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Nutrition - Egestion
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Nutrition – Egestion in Leukocytes
• in which the bacteria, having been ingested and enclosed in a digestive vacuole by the leukocyte, are ejected by the living cellto the outside
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Nutrition – egestion in mammals
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TRANSPORT
• The absorption of materials through cell membranes and the circulation, or distribution of materials to all the cells of an organism.
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TRANSPORT
• Elodea cells • Human Circulation
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RESPIRATION
• The process of releasing energy from organic molecules for use by cells.
• During respiration glucose is broken down, and the energy released is stored in the compound ATP.
• Energy released by the compound ATP is used by organisms to perform life functions.
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RESPIRATION
• Plants and animals use the oxygen in the air to turn food into energy.
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RESPIRATION
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RESPIRATION
• Human Respiratory System
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EXCRETION
• The elimination of cellular waste products from the organism.
• These wastes include water, carbon dioxide, salts, and nitrogen-containing compounds.
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EXCRETION
• Urine Sample
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SYNTHESIS
• Chemical reactions in which small molecules combine to form larger ones.
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SYNTHESIS
• Combining 2 glucose molecules to make a larger maltose molecule
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GROWTH
• An increase in size brought about by increases in cell size and cell number.
• The raw materials for growth are the products of synthesis.
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GROWTH
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REGULATION
• The control and coordination of life functions.
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REGULATION
• Nucleus • Brain
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• All living things respond to changes. Living things notice changes in their surroundings and react to them.
• Eg. Plants grow towards the light.
• Eg. People react to the temperature around them.
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REPRODUCTION
• The production of new individuals.
• Reproduction is necessary for the survival of a species, or kind of organism.
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REPRODUCTION
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• LIFE PROCESSES VIDEO