TOPIC: Life Processes/Functions AIM: What are the life processes?

WHAT CHARACTERISTICS OR PROPERTIES SEPARATE THESE ITMES?

WHAT CHARACTERISTICS OR PROPERTIES SEPARATE THESE ITMES?

WHAT IS LIFE? There is NO ONE definition of LIFE, so scientists use several functions to describe life.

Life Functions GROWTH NUTRITION REGULATION TRANSPORT REPRODUCTION METABOLISM HOMEOSTASIS NUTRITION TRANSPORT RESPIRATION EXCRETION SYNTHESIS

BETTER KNOWN AS ‘EATING’ INVOLVES ALL PROCESSES OF EATING LIKE: NUTRITION BETTER KNOWN AS ‘EATING’ INVOLVES ALL PROCESSES OF EATING LIKE: 1. INGESTION 2. DIGESTION 3. EGESTION/ELIMINATION

Ingest food = take it in (eat)

TRANSPORT NOT MOVEMENT!!! ABSORPTION, DISTRIBUTION and CIRCULATION of material throughout the cells

INCLUDES THE CHEMICAL ACTIVITIES THAT CREATE AND RELEASE ENERGY RESPIRATION NOT JUST BREATHING !!!! INCLUDES THE CHEMICAL ACTIVITIES THAT CREATE AND RELEASE ENERGY

Production of ENERGY Need nutrients (glucose) to make energy needed perform various activities Respiration

Plants and animals use the oxygen in the air to turn food into energy.

Elimination of cellular/metabolic waste EXCRETION Elimination of cellular/metabolic waste CO2, Water, Salts

Sweat = water, salt, urea (nitrogen waste)

Process by which small molecules combine to form larger molecules Synthesis Process by which small molecules combine to form larger molecules

An increase in cell size and/or cell number Growth An increase in cell size and/or cell number

Increase in cell size

Bacteria cells dividing

Regulation The control and coordination of various activities, including responses to stimuli

Plants grow towards the light. People react to the temperature around them.

Production of new individuals. Reproduction Production of new individuals. NOT NECESSARY FOR THE SURVIVAL OF THE INDIVIDUAL

Sum total of all life processes in the body Every single thing carries out metabolic activities Metabolism

Maintains HOMEOSTASIS HOMEOSTASIS = maintaining a stable, internal environment