Biology
Human Excretion and Kidney Physiology
1,152 Questions
Human excretion and kidney physiology questions test your understanding of the excretory system, including the role of renal tubules and glomerular filtration. You will also find topics on urine formation, body water absorption, and excretory products. This section is vital for medical and general science exam preparation.
Glomerular filtrationRenal tubule absorptionExcretory productsRole of sodium ionsHuman excretory system
Human Excretion and Kidney Physiology Questions
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potassium
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glucose
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urea
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water
D
Correct answer
Explanation
Loop of Henle refers to the absorption of water. The kidneys produce concentrated urine by a complex sequence of events which is known as the counter-current multiplier system. This system resides in the loop of Henle, which is a hairpin loop interposed between the proximal and distal tubules of a nephron.
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Neuron
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Nephron
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Glomerulus
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Cochlea
B
Correct answer
Explanation
The nephron is the functional unit of the kidney, responsible for filtering blood and producing urine. Neurons transmit nerve signals, glomerulus is part of the nephron, and cochlea is in the ear.
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renal veins
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renal arteries
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efferent arterioles
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afferent arterioles
D
Correct answer
Explanation
Blood vessels leading into Bowman's capsule are called afferent arterioles and discharge blood into an efferent arteriole. Because the calibre of the efferent arteriole is smaller than that of the afferent arteriole, a resistance to blood flow out of the golmeruli is developed. As a result, a golmerular hydrostatic pressure builds up in the glomerulus.
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Only 1
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Only 2
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Only 3
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Only 1 and 2
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Only 2 and 3
B
Correct answer
Explanation
This option is correct. Renal cell carcinoma is a cancer of the kidney that originates in the lining of the proximal convoluted tubule.
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bronchitis
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liver trouble
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kidney trouble
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heart trouble
C
Correct answer
Explanation
Dialysis is a medical procedure that acts as an artificial replacement for lost kidney function in people with kidney failure. It filters waste products and excess water from the blood, a task normally performed by healthy kidneys.
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urethra
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ureter
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collecting duct
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renal vein
B
Correct answer
Explanation
The ureter is the tube that transports urine from the renal pelvis of the kidney to the urinary bladder. The urethra is the tube that carries urine from the bladder to the outside of the body. Therefore, urine leaves the kidney specifically through the ureter.
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Vasa recta
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Collecting duct
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Bowman's capsule
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Tubular part of nephron
C
Correct answer
Explanation
Filtration occurs in the glomerulus, which is a network of capillaries enclosed by the Bowman's capsule. This structure filters water and small solutes out of the blood while retaining larger proteins and cells. The subsequent tubular parts of the nephron are primarily involved in reabsorption and secretion.
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ureters
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urethera
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vena cava
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aorta
A
Correct answer
Explanation
The ureters are the two tubes that connect the kidneys to the urinary bladder, allowing urine to flow downward for storage. The urethra is the single tube that eventually drains the bladder to the outside of the body. Vena cava and aorta are major blood vessels, not part of the urinary drainage system.
A
Correct answer
Explanation
Hemodialysis is a medical procedure used to filter waste products and excess water from the blood when the kidneys are no longer able to perform these functions. It essentially serves as an external, mechanical replacement for kidney function. This process helps maintain the body's chemical balance and blood pressure.
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Aorta
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Renal artery
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Renal vein
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Vena cava
B
Correct answer
Explanation
The renal artery branches off from the aorta to deliver blood containing nitrogenous wastes to the kidneys for filtration. Once filtered, the blood leaves through the renal vein. The aorta and vena cava are the main systemic vessels that connect to these renal branches.
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Calcitonin
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Antidiuretic hormone
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Insulin
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Relaxin
B
Correct answer
Explanation
Antidiuretic hormone (ADH), also known as vasopressin, is released by the pituitary gland. It increases the permeability of the collecting ducts in the nephron, allowing more water to be reabsorbed into the bloodstream.
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Heart
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Lungs
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Kidneys
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Intestines
C
Correct answer
Explanation
The kidneys are the primary organs responsible for filtering waste products from the blood and producing urine.
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Urea
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Sugar
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lactic acid
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Uric acid
B
Correct answer
Explanation
Diabetes mellitus is characterized by hyperglycemia, which leads to the presence of excess glucose (sugar) in the urine, a condition known as glycosuria.
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mesonephros
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metanephros
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pronephros
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archinephros
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all of the above
B
Correct answer
Explanation
It is a functional kidney of higher vertebrates or amniotes.
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Haemodialysis
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Chemodialysis
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Kidney transplant
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Haemotransplant
A
Correct answer
Explanation
Haemodialysis is the most common procedure used to filter waste products from the blood when the kidneys are no longer functioning properly.