Introduction :
The excretory system consists of the kidneys, ureters, bladder, and urethra. The aim of the system is to eliminate waste from the body in form of urine, regulate blood volume and blood pressure, management levels of electrolytes and metabolites, and regulate blood pH scale.

Answer to Problem 1E
Correct answer :
Option (b) is correct.
Explanation of Solution
Explanation/justification for the correct answer :
Option (b) Bladder. The kidneys are the main organs of the excretory system and it filters the blood to form urine. The urine formed in the kidney is transferred through the ureters, which is a tube-like structure. The ureter carries the urine to the urinary bladder, where the urine is stored before it is released to the external environment through the urethra. Hence, option (b) is correct.
Explanation for incorrect answer :
Option (a) Kidneys: The first function of the urinary organ is the filtration of blood and thereby controls the ionic composition, osmolarity, volume, and pH of plasma. The kidneys are concerned with the elimination of
Option (c) Ureter. The ureter is a tube-like structure, which transfers the urine from the kidney to the urinary bladder. It cannot store the urine. Hence, this option is incorrect.
Option (d) Urethra: It is a channel like a tube that transports the urine from the bladder to outside of the body. Hence, this option is incorrect.
Option (e) Gallbladder: The gall bladder is the site for the storage of bile juices secreted by the liver. The bile juice helps in the digestion of fats. Hence, this option is incorrect.
The urinary bladder is the site of the storage of the urine. Hence, option (b) is correct.
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Chapter 18 Solutions
EBK PRINCIPLES OF HUMAN PHYSIOLOGY
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