BIOL1412 Laboratory 6.docx

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Department
Biological Sciences
Course
BIOL 1412
Professor
Paul Messing
Semester
Winter

Description
Lab 6 Exercise 1: on homeostasis Questions: 1) * body's equilibrium for cells to survive (despite external environment) ­ glucose levels (and ion [   ]s) ­ heart rate (blood pressure)   ­ respiration rate (2 levels) ­ temperature ­ pH (~ 7.35 ­ 7.45) 2) * body's response to change stimulus →  receptor →  CNS →  effector       a) opposite direction of input (goes back to set point)      ex. shivering from cold (detected by hypothalamus by thermostat cells) (hot: sweat glands)       b) output intensifies input      ex. urine contraction          voltage­gated AP of Na+ channels 6) * NS and Endocrine Systems ­ modifies internal systems to maintain homeostasis 7) = disease →  death 8) * many systems working together to maintain homeostasis Exercise 2: on regulation of respiration and heart rate Questions: 1) i) 1) Voluntary control (ex. breathing) 2) Non­vital functions (ex. sneezing, coughing) 3) Medulla Oblongata (respiration rate) 4) Pons (fine tuning of breathe) 5) Chemical control (peripheral chemoreceptors) ­ found in aortic arch ­ detect pH, CO 2 and O2 [   ] * stretch receptors and hypothalamus    ii)  ­ to take in more oxygen ­ body produce more CO 2 ∴ O 2 increase as respiration rate increase ­ adrenaline ­ proprioceptors pH H+ high ⇓ low low ⇑ high   iii) C2 + H 2O ⟷ H 2CO 3 ⟷ H+ + HCO 3­          carbonic anhydrase       Tissues ⟶                     ⟵ Lungs 3) * heart rate ⇓ (rest and digest) ­ ACh binds to K+ channels ∴ channe
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