which of the following forms a hormone receptor complex on the cell membrane ?

Options

A. Cortisol
B. Testosterone
C. Insulin
D. Progesterane

Answer

To answer the question "Which of the following forms a hormone receptor complex on the cell membrane?" we need to analyze the options provided: cortisol, testosterone, insulin, and progesterone.

### Step-by-Step Solution:

1. **Understanding Hormone Types**:
- Hormones can be classified into three main types: lipid-derived (steroid hormones), amino acid-derived, and peptide hormones.
- Lipid-derived hormones (like cortisol, testosterone, and progesterone) are typically hydrophobic and can easily pass through the cell membrane.

2. **Analyzing the Options**:
- **Cortisol**: A steroid hormone that can easily pass through the cell membrane and does not require a receptor on the membrane to exert its effects.
- **Testosterone**: Also a steroid hormone, similar to cortisol, and can pass through the cell membrane without needing a membrane receptor.
- **Progesterone**: Another steroid hormone that can diffuse through the cell membrane and does not bind to membrane receptors.
- **Insulin**: A peptide hormone that is hydrophilic and cannot pass through the cell membrane. Instead, it binds to specific receptors on the cell membrane to form a hormone-receptor complex.

3. **Conclusion**:
- Among the options, insulin is the only hormone that forms a hormone receptor complex on the cell membrane. It binds to its receptor, initiating a signaling cascade that leads to its physiological effects, such as regulating glucose metabolism.

### Final Answer:
**Insulin** forms a hormone receptor complex on the cell membrane.

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