Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 41, Problem 27CTQ
How does the renin-angiotensin-aldosterone mechanism function? Why is it controlled by the kidneys?
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Renin is secreted in response to hypovolemia or to an increase in the osmolality of the blood. Provide three possible mechanisms by which these conditions may stimulate rennin secretion. What are the consequences of increased rennin secretion that lead to increased aldosterone secretion? Present this sequence of events. Why are angiotensin converting enzyme inhibitors (ACEIs) used as a common therapy for hypertension? How do they influence blood pressure? Are plasma levels of renin elevated or depressed in a patient with Conn’s disease? Why?
Diagram/flow chart the reactions and interactions of the renin-angiotensin-aldosterone pathway. What conditiion is the primary stimulus for its activation? What would hapen to renin secretion in a patient with chronic kidney failure?
Describe the renin-angiotensin-aldosterone pathway.
Chapter 41 Solutions
Biology 2e
Ch. 41 - Figure 41.5 Which of the following statements...Ch. 41 - Figure 41.6 Which of the following statements...Ch. 41 - Figure 41.8 Loop diuretics are drugs sometimes...Ch. 41 - When a dehydrated human patient needs to be given...Ch. 41 - The sodium ion is at the highest concentration in:...Ch. 41 - Cells in a hypertonic solution tend to: shrink due...Ch. 41 - The macula densa is/are: present in the renal...Ch. 41 - The osmolarity of body fluids is maintained at...Ch. 41 - The gland located at the top of the kidney is the...Ch. 41 - Active transport of K+ in Malpighian tubules...
Ch. 41 - Contractile vacuoles in microorganisms:...Ch. 41 - Flame cells are primitive excretory organs found...Ch. 41 - BUN is. blood urea nitrogen blood uric acid...Ch. 41 - Human beings accumulate ____before____ excreting...Ch. 41 - Renin is made by. granular cells of the...Ch. 41 - Patients with Addison's disease retain water...Ch. 41 - Which hormone elicits the 'fight or flight”...Ch. 41 - Why is excretion important in order to achieve...Ch. 41 - Why do electrolyte ions move across membranes by...Ch. 41 - Why are the loop of Henle and vasa recta important...Ch. 41 - Describe the structure of the kidney.Ch. 41 - Why might specialized organs have evolved for...Ch. 41 - Explain two different excretory systems other than...Ch. 41 - In terms of evolution, why might the urea cycle...Ch. 41 - Compare and contrast the formation of urea and...Ch. 41 - Describe how hormones regulate blood pressure,...Ch. 41 - How does the renin-angiotensin-aldosterone...
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- Define renin-angiotensin-aldosterone mechanismarrow_forwardOne type of diuretic given to people with high blood pressure, renal disease and congestive heart failure are thiazide-type diuretics. These drugs inhibit sodium ion reabsorption by inhibiting the transport in the ascending limb of the loop of Henle. A) What does it mean to inhibit the transport of sodium ions in the loop of Henle? B) Explain how this inhibition of sodium ions in the loop of Henle could help increase urine production.arrow_forwardPlease help me with these questions, more than one answer may be correct for each:1) Which of the following statements are true about the renin-angiotensin-aldosterone axis? A) Angiotensin II stimulates production of aldosterone, which increases sodium reabsorption B) Renin converts angiotensinogen to angotensin I C) Angiotensin II stimulates production of vasopressin, which increases aquaporins in the collecting duct D) Vasopressin decreases thirst E) Renin lowers GFR 2) The purpose of excretion is to A) maintain internal pH B) remove harmful substances C) maintain plasma volume D) maintain osmotic balance E) maintain internal solute concentrationarrow_forward
- ANP (atrial natriuretic peptide) can be considered to act against (in opposition to) the reninangiotensin-aldosterone-system (RAAS). What then does ANP try to achieve?arrow_forwardDescribe the response of the renin-angiotensinaldosterone hormone mechanism to a decrease in bloodpressure. How are extracellular fluid volume and urinevolume affected?arrow_forwardthere is a known cause of high blood pressure that occurs because of a reduced fluid flow that triggers RAAS and Na+ reaborption with increased blood volume and pressure. what is it?arrow_forward
- Why does evaporation of water have such a powerfulcooling effect?arrow_forwardWhat effect does atrial natriuretic hormone (ANH) haveon extracellular fluid volume?arrow_forwardWhat are the main actions of the renin–angiotensin– aldosterone pathway? Compare the actions of this pathway with the actions of ANP.arrow_forward
- Drugs that increase urine flow (diuretic drugs) are often employed in the treatment of hypertension (high blood pressure) or other disease states. Three physiological categories of such drugs are ones that (i) function as loop diuretics, (ii) inhibit the action of aldosterone, and (iii) block Na+ channels in the collecting ducts. Explain why each of these categories would be expected to increase Na+ excretion and urine flow.arrow_forwardWhy are more phosphate ions required in the ICF than inthe ECF? How does this affect the distribution of calciumions between these fluid compartments?arrow_forwardWhy is excretion important in order to achieve osmotic balance?arrow_forward
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