Bio 6 - Unit 6 Metabolism Instructor Cheryl Dunham Office...

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Unit 6:  Metabolism Instructor: Cheryl Dunham Office: 102 LeFevre Hall Box: 114 LeFevre Hall
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KNOW YOUR  VOCABULARY
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Metabolism Metabolism  – series of chemical (enzymatic) reactions  that are essential for life All living things engage in metabolic activity Metabolic processes generally involve consuming  oxygen  while breaking down  glucose  to obtain energy,  leaving byproducts of  carbon dioxide  and  water Gasses involved in metabolism enter and leave cells  through simple  diffusion
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Metabolic Activity in Plants Plants must also engage in metabolic activity to  release energy from stored food ie. germinating seeds Endosperm  – where starch is stored Embryo  – where metabolism occurs turns starch into glucose (simple  sugar unit that can be further used in  enzymatic reactions) http://www.nataliedee.com/012106/corn.jpg
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Metabolic Activity in Animals Because  oxygen is consumed during metabolism oxygen consumption can be used as a  measure of  metabolic activity In  insects , oxygen consumption  rates rise  with that  of  temperature In order to make comparisons of metabolic activity  of organisms of varying size, weight must be  factored into the equation Weight-specific metabolic rate  (oxygen consumption) = (oxygen consumption rate)/(weight of organism) http://www.evilkid.com/downloads/ico ns/roach.jpg
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Gas Exchange in Terrestrial Animals Insects Tracheae  – a system of branched tubules that carry oxygen  from outside the body directly to the tissues Air enters and leaves the body through  spiracles  (tiny openings  in the body wall) The ends of tracheae are in direct contact with muscles and  tissues Gas exchange  occurs through  diffusion http://www.earthlife.net/insects/images/anatomy/trachea.gif
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Gas Exchange in Terrestrial Animals Humans (and other  mammals require large  amounts of oxygen  to be supplied to metabolizing  tissues Oxygen is  delivered through the cardiovascular  system Involves the  exchange of gas between the atmosphere and  the blood via simple  diffusion This exchange takes place  inside the lungs http://webtech.kennesaw.edu/joannregruto/images/lungs.gif
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Human Respiratory Systems Air moves  into  the body through the mouth to the  trachea => bronchi => bronchioles => alveoli Air moves  out  of the body from the  alveoli => bronchioles => bronchi => trachea , and then out through the nose and mouth http://apps.uwhealth.org/health/adam/graphics/images/en/19595.jpg http://www.aduk.org.uk/gfx/lungs.jpg
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Human Respiratory System Alveoli Tiny air sacs in the lungs Where gas exchange  between the body and the  atmosphere actually  takes  place Help 
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