Question

(d) Define excretion.
(b) Why does the cortex
of the kidney show a
dotted appearance ?
(C) Why does the medulla of the kidney show a striped
appearance ?​

Answer 1

Answer:

the process of eliminating or expelling waste matte

Explanation:

The Cortex of the kidney shows a dotted appearance because there are several complex structures in kidney which are known as Nephrons. All these Nephrons are microscopic; hence they cannot be seen by naked eyes.

The medulla consists of a number of medullary pyramids, named because of their triangular shape. These are striped in appearance because they contain microscopic coiled tubes called nephrons, the functional unit of the kidney . ... The collecting ducts merge at the base of the pyramids to form the renal papilla.

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Answer 2

D.(in living organisms and cells) the process of eliminating or expelling waste matter.

C.The medulla consists of a number of medullary pyramids, named because of their triangular shape. These are striped in appearance because they contain microscopic coiled tubes called nephrons, the functional unit of the kidney . ... The collecting ducts merge at the base of the pyramids to form the renal papilla

B.The cortex of Kidney appears dotted due to presence of Nephrons (also known as units of Kidney which help in urine formation). ... These Nephrons consist many tubules (like proximal convulated tubule and distal convulated tubule), thus giving the cortex a dotted appearance.

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