Question

The diagram given alongside represents an organ system in the human body. Study the same and answer the questions that follow:

1. Identify the system
2. Label the parts marked 2 and 4. Mention the function of part 5.
3. Name the structural and functional units of the part marked 1.
4. What is the fluid that accumulates in part 3?
   Which is the main nitrogenous waste present in it?
5. Draw a neat, labelled diagram showing the longitudinal section of part 1.

Answer 1

1. The diagram shows the urinary (excretory) system.
2. 2: Ureter
   4: Sphincter muscle
   Part 5 is the urethra. Its function is to expel urine from the urinary bladder to the outside of the body during urination (micturition).
3. The structural and functional units of the kidneys are nephrons.
4. Fluid that accumulates is urine. The main nitrogenous waste present in it is urea.
5.