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Homeostasis Homeostasis The ability for the body remain stable as the _______ ____________ Environment changes. How does the body try to maintain homeostasis? Equilibrium Occurs when there is an equal ________ amount of molecules on __________ on both sides Molecules ___________ exchange/move at equal rates Permeability of Cells Lab Identify the type of transport Sodium + (Na )/Potassium + (K ) Pump Maintains homeostasis by 3 Na+ ions removing _____ and bringing in 2 K+ ions _____ Molecules move Against/up ________ the gradient. http://www.youtube.com/wa tch?v=GTHWig1vOnY Ocular Fluid and Time of Death Cells in the eye Potassium (K+) release ________ death after _____ Eye becomes __________ cloudy Why does this occur? – K+ pump is leaking out Osmotic Movement Need Help Remembering Osmosis? https://www.youtube.c om/watch?v=HqKlLm2 MjkI Determine Each Osmotic Condition Algor Mortis Cooling ________ of the body after death ______ Body cools at ____ 1.5 degrees/hour Factors Effecting Algor Mortis 1. 2. 3. _____________ Amount of Body Fat _____________ Amount of Clothing Temperature _____________ Kenny Oh no! Someone killed Kenny! The body of Kenny was found this morning in the front office, according to investigators his body temperature was 72.6 degrees. How long has he been dead? Miley Cyrus The body of Miley Cyrus was found last night, according to investigators her body temperature was 50.2 degrees. How long has she been dead? Carl Looks like a Walker finally got to Carl! Carl’s body (or what’s left of it) was found on a snowy embankment. According to investigators his body temperature was 78.6 degrees. How long has he been dead? How did the weather effect the cooling of his body? Explain your answer. Kim Kardashian Kim Kardashian was found dead on Sunday, she was dressed in a velvet track suit and a beanie. According to investigators her body temperature was 86.4 degrees when they arrived on scene. How long has she been dead? How long has she been dead? How did her clothing effect the cooling of her body? Explain you answer. Homer Simpson Homer Simpson has eaten his final donut. His body was found on Friday afternoon, according to investigators his body temperature registered at 82.6 degrees. How long has he been dead? How did his body mass effect the cooling of his body? Explain your answer. James Marsden The body of James Marsden was found face down at the Santa Fe dam. His body was found lying face up. There were blue-purple marking on his back. Was his body moved after death? What leads you to think this? Young Girl You arrive at your crime scene and see the body of a young girl. She is lying face down in the grass with her arms under her body and her legs were shaped in an ‘x”. There are blue-purple marking covering the entire back of her body, EXCEPT for her buttocks and shoulders which were left in the coloring of her normal skin tone Lab Review Why did the starch solution turn purple after soaking in the iodine solution? Explain why the potatoes in the 15% salt lost weight, while the potatoes in 1% salt and tap water gained weight. Summary Qustions 1. 2. Why does active transport require energy? How does the sodium-potassium pump maintain homeostasis in the body?