Question

2. The structures, present in kidney, which act as
(d) None of the above
filters are
(b) Nephrons
(a) Alveoli
(c) Villi
3. The urinary bladder opens into
(a) Urethra
(c) Ureter
(d) Neuron
(b) Nephron​

Answer 1

Answer:

1.Internally, the kidney has three regions—an outer cortex, a medulla in the middle, and the renal pelvis in the region called the hilum of the kidney. The hilum is the concave part of the bean-shape where blood vessels and nerves enter and exit the kidney; it is also the point of exit for the ureters.

2.Two of the openings are from the ureters and form the base of the trigone. Small flaps of mucosa cover these openings and act as valves that allow urine to enter the bladder but prevent it from backing up from the bladder into the ureters. The third opening, at the apex of the trigone, is the opening into the urethra.