Lecture_18 - Motivated Behaviors Best understood behaviors...

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Motivated Behaviors Best understood behaviors are those that maintain homeostasis Hypothalamus Hypothalamic response to homeostatic challenge - Humoral response - secretion of hormones - viceromotor response - changes in ANS -sympathetic system increases -parasympathetic system decreases - somatic motor response - changes in brain to motivate you to change behavior Energy balance: - animal with low energy - the system drives to obtain energy (food) - animal with high energy - there is no drive to obtain energy (food) - long term drive sustains us through every day health - short term drive is the feeling that we haven't eaten in a few hours Energy sources: - Glucose - all brain cells use this for energy -used by neurons; stored as glycogen for quick easy source of glucose for brain cells - Free fatty acids - non-neuronal cells use these sources better. .. stored as triglycerides (three fatty acids around 1 glucose) - Ketones - non-neuronal cells use these - used as an emergency energy source. .. not preferred -you use ketones if you are on a no carb diet and have no reserves. .. eventually a person who continues like this will have a ketone smell on their breath (smells like acetone) Prandial State: Anabolism (fig 16.1) -you have food in your body. .. currently digesting -Energy created by anabolic metabolism -food is broken down into nutrients -additional energy is stored * Adipose - fat tissue that stores fatty acids * Glycogen - limited storage in areas; mainly the liver (some in muscles and kidneys -these areas are non retrievable. .. must be used for that organ or muscle energy only) Postaborptive state: Catabolism (fig 16.1) -Glucose is recalled from the liver -Fatty acids recalled from triglycerides (fat tissue) -Ketones recalled from triglycerides
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Energy balance and body fat (fig 16.2) -Intake = expenditure --> normal body fat
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Lecture_18 - Motivated Behaviors Best understood behaviors...

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