NEETZoologyExcretory Products and their Elimination
What is the excretory system in humans comprised of?
Options
- AOne pair of kidneys and a urethra
- BOne pair of kidneys, a pair of ureters, a urinary bladder and a urethra
- COne pair of kidneys and a urinary bladder
- DOne pair of kidneys and a pair of ureters
Correct answer
B. One pair of kidneys, a pair of ureters, a urinary bladder and a urethra
Step-by-step solution
In humans, the excretory system consists of a pair of kidneys, one pair of ureters, a urinary bladder and a urethra (Figure 16.1). Kidneys are reddish brown, bean shaped structures situated between the levels of last thoracic and third lumbar vertebra close to the dorsal inner wall of the abdominal cavity. Each kidney of an adult human measures 10-12 cm in length, 5-7 cm in width, 2-3 cm in thickness with an average weight of 120- 170 g. Towards the centre of the inner concave surface of the kidney is a notch calle