Mark the following statements as true or false. If a statement is false, correct it to make a true statement.


b. The distal tubule reabsorbs sodium ions and secretes potassium and hydrogen ions in response to ADH.

Verified step by step guidance

1. Step 1: Understand the role of the distal tubule in the nephron. The distal tubule is involved in the reabsorption and secretion of various ions, which is crucial for maintaining electrolyte and acid-base balance.
2. Step 2: Identify the hormones that influence the distal tubule. The primary hormones affecting the distal tubule are aldosterone and antidiuretic hormone (ADH).
3. Step 3: Clarify the role of ADH. ADH primarily acts on the collecting ducts to increase water reabsorption, not directly on the distal tubule for ion exchange.
4. Step 4: Recognize the role of aldosterone. Aldosterone stimulates the distal tubule to reabsorb sodium ions and secrete potassium and hydrogen ions.
5. Step 5: Correct the statement. The distal tubule reabsorbs sodium ions and secretes potassium and hydrogen ions in response to aldosterone, not ADH.

Key Concepts

Distal Tubule Function

The distal tubule is a segment of the nephron in the kidney responsible for the reabsorption of sodium ions and the secretion of potassium and hydrogen ions. This process is crucial for maintaining electrolyte balance and regulating blood pressure. The distal tubule's activity is influenced by hormones, particularly aldosterone, rather than antidiuretic hormone (ADH).

Role of ADH

Antidiuretic hormone (ADH), also known as vasopressin, primarily regulates water reabsorption in the kidneys. It acts on the collecting ducts to increase their permeability to water, allowing more water to be reabsorbed back into the bloodstream. While ADH does not directly affect sodium or potassium ion transport in the distal tubule, it plays a critical role in overall fluid balance.

Aldosterone's Influence

Aldosterone is a steroid hormone produced by the adrenal glands that promotes sodium reabsorption and potassium secretion in the distal tubule. It helps regulate blood pressure and fluid balance by increasing sodium retention, which in turn influences water retention. Understanding aldosterone's role is essential for comprehending the mechanisms of electrolyte balance in the kidneys.