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Assertion :- Proximal convoluted tubule ...

Assertion `:-` Proximal convoluted tubule is lined by brush-bordered cuboidal epithelium.
Reason `:-` PCT is main site of selective reabsorption of useful material from nephric filtrate.

A

If both Assertion and Reason are true and Reason is correct explanation of the Assertion.

B

If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.

C

If Assertion is true but Reason is false.

D

If both Assertion and Reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
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Which of theses statements about proximal convoluted tubule is/are true? I. it is lined by simple columnar brush border epithelium which increases the surface area for reabsorption. II Nearly all of the essential nutrients and 70%-80% of electrolytes and water are reabsorbed by this segment. III. It selectively secretes hydrogen ions, ammonia and potassium ions into the filtrate. IV. It is the most convoluted part of the nephron and is present in the medullary region of the kidney.

Assertion :- Simple cuboidal brush bordered epthelium is found in PCT of nephrons Reason :- Maximum reabsorption of substances takses place in PCT of nepthrons.

Assertion (A) : The main excretory unit of kidney is nephron. Reason (R) : It carries out filtration, selective absorption and tubular secretion to from urine in kidney.

Assertion (A): Malpighian capsule completely separates the waste material from the nutrients present in the bloodstream. Reason (R): Selective reabsorption, secretion and transportation of urine are the functions of renal tubule.

Consider the following four statements (i) - (iv) and select the correct option stating which ones are true (T) and which ones are false (F). (i) The epithelium of proximal convoluted tubule (PCT) of nephron in the kideney has microvilli. (ii) Simple epithelium covers the dry surface of the skin, the moist surface of buccal cavity, pharynx, inner lining of ducts of salivary glands and of pancreatic ducts. (iii) The wall of internal organs such as the blood vessels, stomach and intestine contains skeletal muscle. (iv) The earthworm nervous system is basically represented paired nerve cord.

Assertion :- In PCT all of the essential nutrient and 70-80 percent of electrolytes and water are reabsorbed. Reason :- PCT is lined by simple cuboidal brush border epithelium which increases the surface , are for reabsorption.

Consider the following four statements (i) - (iv) and select the correct option stating which ones are true (T) and which ones are false (F) (i) The epithelium of proximal convoluted tobule (PCT) of nephron in the kidney has microvilli (ii) Simple epithelium covers the dry surface of the skin, the moist surface of buccal cavity, pharynx, inner lining of salivary glands and of pancreatic ducts (iii) The wall of internal organs such as the blood vessels, stomach and intestine contains skeletal muscle (iv) Bone marrow in some bones is the site of production of blood cells.