What is the main function of kidneys?

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

(i) Identify the system.

(ii) Label the parts marked 2 and 4. Mention the function of part 5.

(iii) Name the structural and functional units of the part marked 1.

(iv) What is the fluid that accumulates in part 3? Which is the main nitrogenous waste present in it?

(v) Draw a neat, labelled diagram showing the longitudinal section of part 1.

Choose the correct answer from the four options given below:

The structural and functional units of excretion in the human kidney is the:

The figure given below shows a part of a nephron.

Answer the questions that follow:

(i) In which region of the kidney is the above structure present?

(ii) Label the parts numbered 1 to 4.

(iii) What is the technical term for the process that occurs in part 3?

(iv) Why is fluid X not called urine? Justify your answer.

(v) Draw a neat, labelled diagram of the urinary system of man.

Differentiate between the following pairs on the basis of what is indicated in the brackets.

 Ureter and Urethra [function]

Draw excretory system in human beings and label the following organs of the excretory system which performs the following functions:

(i) form urine.
(ii) is a long tube that collects urine from the kidney.
(iii) store urine until it is passed out.

i) Draw the diagram of the human excretory system and label:
a) urinary bladder
b) urethra.

ii) Name two major components of normal human urine.