The hormone that stimulates the reabsorption of water in the collecting duct is:
A. Aldosterone
B. Renin
C. Atrial natriuretic peptide
D. Antidiuretic hormone (ADH)
Answer: Option D
Solution (By JKSSB Mock Tests)
ADH (vasopressin) increases water permeability of the collecting duct cells by inserting aquaporins, reducing urine volume. Aldosterone increases sodium reabsorption, renin is an enzyme, ANP promotes sodium excretion.
Explanation:
DNA fingerprinting (DNA profiling) is a technique used to identify individuals based on their unique DNA patterns. It primarily relies on the analysis of Variable Number Tandem Repeats (VNTRs) or Short Tandem Repeats (STRs), which are highly polymorphic, non-coding, repetitive DNA sequences that vary greatly in length and number between individuals.
Explanation:
The hepatic portal system directs nutrient-rich blood from intestines to liver. Blood pressure is highest in arteries; fish have two-chambered heart; foramen ovale is a fetal structure that closes after birth.
Explanation:
The liver is the primary site of glycogen storage and releases glucose into the blood between meals (glycogenolysis) to maintain blood sugar. Muscles also store glycogen but for local use. The pancreas regulates blood sugar via insulin/glucagon, spleen stores blood and recycles iron, kidneys excrete waste.
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