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 11RQ
Contractile vacuoles in microorganisms:
- exclusively perform an excretory function
- can perform many functions, one of which is excretion of
metabolic wastes - originate from the cell membrane
- both b and c
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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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- As the text noted, two-thirds of the water and solutes that the body reclaims by reabsorption in nephrons occurs in the proximal tubule. Proximal tubule cells have large numbers of mitochondria and demand a great deal of oxygen. Explain why.arrow_forwardFatty tissue holds the kidneys in place. Extremely rapid weight loss may cause this tissue to shrink so that the kidneys slip from their normal position. On rare occasions, the slippage can put a kink in one or both ureters and block urine flow. Suggest what might then happen to the kidneys.arrow_forwardExcretory systems produce a final excreted product through A. vesicular packaging of nitrogenous wastes. B. proteolytic cleavage of amino acids. C. filtration of lymphatic fluids. D. de novo synthesis in the nephron of urea or uric acid. E. some combination of filtration, secretion and reabsorption.arrow_forward
- Trace the pathway of a metabolic waste from glomerulus to urethra. Be certain to state anatomical landmarks and physiological actions during the route.arrow_forwardActive transport requires the use of ATP. Identify two ions that require active transport to be selectively reabsorbed.arrow_forwardThe renal handling of a novel drug is being studied. When the drug is present in the blood, it is filtered into the Bowman’s capsule and secreted via transport proteins in the renal tubules, but it is NOT reabsorbed. The lines on the following graph represent filtration, secretion and excretion rates of this drug at various plasma concentrations. For the three lines shown (labeled A-C) identify which line represents filtration, which line represents secretion, and which line represents excretion Explain how you determined this.arrow_forward
- Reabsorption of most solute molecules from the proximal convolutedtubule is linked to the active transport of Na+ across thea. apical membrane and out of the cell.b. apical membrane and into the cell.c. basal membrane and out of the cell.d. basal membrane and into the cell.arrow_forwardAnalysis of urine is routinely used in medical screening. The presence of glucose in the urine is normally a sign of concern. Why is glucose normally NOT found in urine? A. Glucose is too large to be included in the glomerular filtrate. B. Glucose is too small to be included in the glomerular filtrate. C. Glucose is reabsorbed in the cortex of the kidney. D. Glucose is secreted in the cortex of the kidney.arrow_forwardThe image for activity below reinforces the location of glucose transports within the epithelial cells forming the wall of the Choose from the following: (A) Bowman's capsule (B) glomerular capillaries (C) proximal convoluted tubule (D) nephron loop (E) distal convoluted tubule (F) collecting ductarrow_forward
- A bird just flew overhead and bird droppings landed on your car. The droppings are a white paste. What are the primary components of this excrement? Compare/contrast excretion of ammonia, urea, and uric acid relative to source, energy needed to produce, and toxicity.arrow_forwardWhich of the following is TRUE concerning glucose transport across the proximal convoluted tubule (PCT)? Group of answer choices must choose one answer Glucose is usually absorbed approximately 70% here and the remainder of the absorption is under hormonal control in the distal convoluted tubule (DCT). Glucose moves by paracellular transport. Glucose moves across the apical membrane by secondary active transport via co-transport with sodium. Glucose transport is passive, requiring facilitated diffusion across both the apical and basolateral membranes.arrow_forwardDiscuss the formation of urine by the kidneys at the molecular level (ammonia to urea).arrow_forward
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