Read the given statements regarding human excretory system...

Read the given statements regarding human excretory system and select the correct ones. (i) Presence of glucose in urine is known as uremia. (ii) Distal convoluted tubule (DCT) selectively secretes hydrogen ions, ammonia and potassium ions into the filtrate. (iii) Macula densa formed by cellular modifications in the their contact location. (iv) Atrial natriuretic factor (ANF) can cause vasoconstriction when blood flow is low to the atria of the heart. (a) (i) and (ii) (b) (i) and (iii) (c) (ii) and (iii) (d) (iii) and (iv)

Read the given statements regarding human excretory system and select the correct ones.
(i) Presence of glucose in urine is known as uremia.
(ii) Distal convoluted tubule (DCT) selectively secretes hydrogen ions, ammonia and potassium ions into the filtrate.
(iii) Macula densa formed by cellular modifications in the their contact location.
(iv) Atrial natriuretic factor (ANF) can cause vasoconstriction when blood flow is low to the atria of the heart.
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (iii) and (iv)

Key Concepts

Distal Convoluted Tubule Secretion

The distal convoluted tubule (DCT) is a critical segment of the nephron responsible for the fine regulation of electrolyte and acid?base balance. It selectively secretes ions such as hydrogen, ammonia, and potassium into the filtrate, contributing to overall homeostasis. This process is an essential aspect of renal tubular function where hormones and local factors finely tune ion levels.

Atrial Natriuretic Factor (ANF)

Atrial natriuretic factor (ANF) is a cardiac hormone released by atrial cells in response to increased blood volume and pressure. Its primary actions include vasodilation, natriuresis, and diuresis, which help reduce blood volume and lower blood pressure. ANF works to counterbalance the effects of systems that cause vasoconstriction, thereby playing a key regulatory role in cardiovascular and renal physiology.

Glucosuria vs Uremia

In renal physiology, the presence of glucose in urine is termed glucosuria, which is typically a sign of hyperglycemia or impaired renal tubular reabsorption. Uremia, on the other hand, refers to the buildup of urea and other nitrogenous waste products in the blood, usually resulting from renal failure. Understanding the difference between these conditions is essential for interpreting urinary findings accurately.

Macula Densa Function

The macula densa is a specialized group of cells located in the juxtaglomerular apparatus, lining the portion of the distal tubule adjacent to the glomerulus. These cells play a crucial role in sensing the sodium chloride concentration of the tubular fluid and thus help regulate glomerular filtration rate and blood pressure through tubuloglomerular feedback. Their function is vital for maintaining fluid and electrolyte balance.

Please give Ace some feedback