Nephron increases na reabsorbtion stimulates

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Unformatted text preview: eases water reabsorbtion Nephron increases Na+ reabsorbtion Thirst · Response Growth (identify a tissue influenced) Biorhythms (repro/sleep) Stimulates Hypothalamus (c) 4 points maximum · Mechanism receptor in cell · receptor in cell membrane Effect · Primarily influences transcription · Primarily activates proteins already present (through signal transduction) Copyright © 2003 by College Entrance Examination Board. All rights reserved. Available at 4 AP® BIOLOGY 2003 SCORING GUIDELINES (Form B) Question 3 Water is important for all living organisms. The functions of water are directly related to its physical properties. (a) Describe how the properties of water contribute to TWO of the following. · transpiration · thermoregulation in endotherms · plasma membrane structure (b) Water serves as a reactant and a product in the carbon cycle. Discuss the role of water in the carbon cycle. (c) Discuss the impact of one human activity on the water cycle. (a) 4 point maximum 2 points for each process / one point per category in the context of linking property to contribution Process Transpiration Property polarity/cohesiveness high heat of vaporization water potential high heat of vaporization high specific heat polarity Thermoregulation Plasma membrane Contribution to Process water movement reduces water loss water movement evaporative cooling heat buffer arrangement of phospholipids (b) 4 points maximum · Reactant in photosynthesis or equation (H2O + CO2 ↔ C6H12O6 + O2 ) · Spec...
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