Identify the incorrect statement regarding the gastric secretions in humans:

Options

A. Probably the only life saving function of humans is secretion of Castle's intrinsic factor
B. Human stomach also produces a small amount of lipase
C. HCI secreted by oxyntic (parietal] cells coverts pepsinogen into pepsin
D. Gastric secretion are regulated by the diencephalon

Answer

To identify the incorrect statement regarding gastric secretions in humans, let's analyze each option step by step.

**Step 1: Analyze Option 1**
- Option 1 states that the secretion of intrinsic factor is a life-saving function of humans.
- This statement is correct because intrinsic factor is essential for the absorption of vitamin B12, which is crucial for red blood cell formation and neurological function.

**Step 2: Analyze Option 2**
- Option 2 mentions that the human stomach produces a small amount of lipase.
- This statement is also correct. Although the stomach primarily secretes pepsin for protein digestion, it does produce a small amount of gastric lipase, which aids in the digestion of fats.

**Step 3: Analyze Option 3**
- Option 3 states that the acid secreted by parietal cells converts pepsinogen into pepsin.
- This statement is correct. The acidic environment in the stomach activates pepsinogen (the inactive form) into pepsin (the active form), which is necessary for protein digestion.

**Step 4: Analyze Option 4**
- Option 4 claims that gastric secretions are regulated by the diencephalon.
- This statement is incorrect. Gastric secretions are primarily regulated by the medulla oblongata, which is part of the brainstem, not the diencephalon.

**Conclusion:**
The incorrect statement regarding gastric secretions in humans is Option 4.

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