Distinct microvilli are present on all of the following except:

The portion of the nephron which is relatively impermeable to water is:

What is the primary role of cortical nephrons?

Cuboidal epithelium with brush border of microvilli is found in:

Glucose,$Na^+$,and amino acids are actively transported substances,because

Which of the following statement$(s)$ is/are true?
$(1)$ Urine is hypertonic in the distal convoluted tubule.
$(2)$ When the urine passes into the collecting tubule,it becomes hypotonic.
$(3)$ Urine is isotonic in the proximal convoluted tubule.
$(4)$ Urine becomes more and more hypotonic as it passes through Henle's loop.