A. Water a. Define blood osmolarity A measure of the hydration status b. What is the nephron's role regarding osmolarity? c. What conditions cause urine to become concentrated? d. Concentrated urine is produces when the body is dehydrated or large amounts of fluids are lost. Filtration occurs as usual even under these circumstances, however, antidiuretic hormone is stimulated from the posterior pituitary gland. Describe the ADH effect B. pH a. Explain the correlation between molecular dissociation and hydrogen ions. b. Explain the function of the pH scale. How does it reflect hydrogen ion concentration (acidosis or alkalosis)? c. Why is pH important to enzymes? d. Explain the importance of blood pH regulation. e. Identify 3 regulatory mechanisms for blood pH. f. The respiratory system regulates blood pH by controlling the amount of carbon dioxide in the blood. Explain g. Describe how the tubular cells of the PCT and collecting ducts (tubules) alter blood pH.
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Identify what aldosterone regulates, and explain how it is stimulated. a. Aldosterone regulates the amount of water excreted by the kidneys and causes direct water reabsorption from the kidney tubules. It is stimulated by decreased water concentration in blood, or increased amounts of blood potassium. b. Aldosterone regulates sodium concentrations in urine, sweat, the pancreas, and saliva. It is stimulated by decreased blood sodium ion concentrations, blood volume, or blood pressure, or increased amounts of blood potassium. c. Aldosterone regulates calcium concentrations in urine, saliva and the pancreas. It is stimulated by decreased blood calcium ion concentrations, blood pressure, blood volume, or increased amounts of blood potassium. d. Aldosterone regulates blood glucose levels by stimulating the breakdown of glycogen to glucose. It is stimulated by decreased concentrations of glucose levels in blood, blood volume, or blood pressure.
12. Consider the following circumstances and decide whether each would cause an individual to produce concentrated urine or dilute urine. Check the correct choice. How would the body maintain homeostasis in each situation? * Working outside all day in 98°F weather * How would the body maintain homeostasis? * Drinking a large volume of water in a 24-hour period * How would the body maintain homeostasis? * Donating blood and therefore experiencing a loss in blood volume * How would the body maintain homeostasis? 13. When the body is dehydrated, are the following items increased or decreased? * Body water: * Blood osmolarity: * ADH release from posterior pituitary: * Water permeability of the collecting ducts: * Water reabsorption: * Urine volume: * Urine concentration:
Adi S.
Match the following structures of the nephron with the correct functions: Impermeable to water; reabsorption of Na+, K+, Cl- from filtrate into medullary interstitium and blood reabsorption of most components of filtrate- glucose, ions, water reabsorption of water ADH dependent; reabsorption of Na+ and urea to maintain osmotic gradient of medulla permeable to water only; reabsorption of water through aquaporin channels filtration of small solutes, glucose, and water to create filtrate ADH dependent reabsorption of water; Aldosterone dependent reabsorption of Na+/secretion of K+ secretion of excesses, wastes, and drugs; PTH dependent reabsorption of Ca++
Sri K.
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