Human Physiology - Excretory Products
Q. What is the main function of the nephron in the kidneys? (2019)
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A.
Filtration of blood
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B.
Production of hormones
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C.
Storage of urine
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D.
Regulation of blood pressure
Solution
The nephron is the functional unit of the kidney responsible for the filtration of blood and the formation of urine.
Correct Answer: A — Filtration of blood
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Q. What is the main function of the renal pelvis? (2022)
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A.
Filtration of blood
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B.
Storage of urine
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C.
Transport of urine to the bladder
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D.
Production of urine
Solution
The renal pelvis collects urine from the collecting ducts and transports it to the ureter.
Correct Answer: C — Transport of urine to the bladder
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Q. What is the main nitrogenous waste product in birds and reptiles? (2022)
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A.
Urea
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B.
Uric acid
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C.
Ammonia
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D.
Creatinine
Solution
Birds and reptiles primarily excrete uric acid, which is less toxic and conserves water compared to urea.
Correct Answer: B — Uric acid
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Q. What is the normal pH range of human urine? (2022)
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A.
4.5 - 5.5
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B.
6.0 - 7.0
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C.
7.5 - 8.0
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D.
9.0 - 10.0
Solution
The normal pH range of human urine is typically between 6.0 and 7.0, indicating it is slightly acidic.
Correct Answer: B — 6.0 - 7.0
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Q. What is the primary excretory product of human metabolism? (2021)
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A.
Urea
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B.
Creatinine
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C.
Uric acid
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D.
Ammonia
Solution
Urea is the primary excretory product formed from the breakdown of proteins in the liver and is excreted by the kidneys.
Correct Answer: A — Urea
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Q. What is the primary function of the renal pelvis? (2022)
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A.
Filtration of blood
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B.
Storage of urine
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C.
Transport of urine to the bladder
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D.
Production of urine
Solution
The renal pelvis collects urine from the collecting ducts and transports it to the ureter.
Correct Answer: C — Transport of urine to the bladder
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Q. What is the role of the loop of Henle in the nephron? (2023)
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A.
Reabsorption of water
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B.
Secretion of urea
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C.
Filtration of blood
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D.
Regulation of pH
Solution
The loop of Henle plays a crucial role in the reabsorption of water and salts, helping to concentrate urine.
Correct Answer: A — Reabsorption of water
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Q. What is the term for the process of urine formation? (2020)
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A.
Filtration
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B.
Reabsorption
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C.
Secretion
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D.
All of the above
Solution
Urine formation involves filtration, reabsorption, and secretion processes in the nephron.
Correct Answer: D — All of the above
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Q. Which hormone regulates the reabsorption of water in the kidneys? (2021)
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A.
Aldosterone
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B.
Antidiuretic hormone (ADH)
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C.
Insulin
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D.
Cortisol
Solution
Antidiuretic hormone (ADH) regulates the reabsorption of water in the kidneys, reducing urine output.
Correct Answer: B — Antidiuretic hormone (ADH)
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Q. Which of the following conditions can lead to the presence of protein in urine? (2023)
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A.
Dehydration
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B.
Kidney disease
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C.
High protein diet
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D.
All of the above
Solution
All of the above conditions can lead to proteinuria, which is the presence of protein in urine, indicating possible kidney issues.
Correct Answer: D — All of the above
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Q. Which of the following is a waste product of protein metabolism? (2019)
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A.
Glucose
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B.
Urea
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C.
Lactate
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D.
Glycogen
Solution
Urea is a waste product formed from the breakdown of proteins and is excreted in urine.
Correct Answer: B — Urea
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Q. Which of the following substances is NOT typically found in urine? (2022)
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A.
Urea
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B.
Glucose
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C.
Creatinine
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D.
Uric acid
Solution
Glucose is not typically found in urine unless there is a condition such as diabetes mellitus.
Correct Answer: B — Glucose
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Q. Which organ is primarily responsible for the excretion of urea? (2020)
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A.
Liver
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B.
Kidneys
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C.
Lungs
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D.
Skin
Solution
The kidneys are primarily responsible for filtering blood and excreting urea in urine.
Correct Answer: B — Kidneys
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Q. Which part of the nephron is responsible for the filtration of blood? (2023)
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A.
Glomerulus
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B.
Proximal convoluted tubule
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C.
Loop of Henle
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D.
Distal convoluted tubule
Solution
The glomerulus is the part of the nephron where blood filtration occurs, leading to the formation of filtrate.
Correct Answer: A — Glomerulus
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Q. Which part of the nephron is responsible for the majority of reabsorption? (2023)
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A.
Glomerulus
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B.
Proximal convoluted tubule
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C.
Loop of Henle
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D.
Distal convoluted tubule
Solution
The proximal convoluted tubule is responsible for the majority of reabsorption of water, ions, and nutrients.
Correct Answer: B — Proximal convoluted tubule
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