To solve the question regarding which statement is correct, we will analyze each option step by step based on the information provided in the video transcript.
### Step-by-Step Solution:
1. **Understanding the Nephron Structure**:
- The nephron is the functional unit of the kidney, consisting of several parts: the glomerulus, Bowman’s capsule, proximal convoluted tubule (PCT), loop of Henle (which includes descending and ascending limbs), distal convoluted tubule (DCT), and collecting duct.
**Hint**: Remember the order of nephron parts and their functions for better clarity.
2. **Analyzing Option 1**:
- The statement claims that the distal convoluted tubule (DCT) is responsible for the reabsorption of potassium ions.
- In reality, the DCT primarily reabsorbs sodium and water, while it is involved in the selective secretion of potassium and hydrogen ions. Therefore, this statement is incorrect.
**Hint**: Focus on the functions of the DCT, particularly its role in secretion versus reabsorption.
3. **Analyzing Option 2**:
- This option states that the afferent arteriole carries blood away from the glomerulus.
- However, the afferent arteriole brings blood into the glomerulus, while the efferent arteriole carries blood away. Thus, this statement is also incorrect.
**Hint**: Visualize the blood flow in the nephron to distinguish between afferent and efferent arterioles.
4. **Analyzing Option 3**:
- The statement mentions that podocytes create minute slit pores for filtration.
- This is correct. Podocytes are specialized cells in the Bowman’s capsule that have foot-like extensions creating filtration slits, allowing for the filtration of blood.
**Hint**: Remember the role of podocytes in filtration and their anatomical structure.
5. **Analyzing Option 4**:
- This option claims that Henle's loop is responsible for the maximum reabsorption of major substances.
- In actuality, the majority of reabsorption occurs in the proximal convoluted tubule (PCT), not in the loop of Henle. Therefore, this statement is incorrect.
**Hint**: Recall the primary sites of reabsorption in the nephron to evaluate this statement accurately.
### Conclusion:
After analyzing all the options, the correct statement is **Option 3**: "Podocytes create minute slit pores for filtration."
