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Which one can pass easily through cell m...

Which one can pass easily through cell membrane of target cells and bind to internal receptors

A

Thyroxine, insulin

B

Somatostatin, Oxytocin

C

Insulin, glucagon

D

Cortisol, testosterone.

Text Solution

AI Generated Solution

The correct Answer is:
To determine which substances can easily pass through the cell membrane of target cells and bind to internal receptors, we need to analyze the properties of the hormones mentioned in the options. Here’s a step-by-step breakdown of the solution: ### Step 1: Understand the Question The question asks which substances can easily pass through the cell membrane and bind to internal receptors. This typically refers to lipid-soluble hormones, as they can diffuse through the lipid bilayer of the cell membrane. ### Step 2: Analyze the Options We have four pairs of hormones to evaluate: 1. Thyroxine and Insulin 2. Somatostatin and Oxytocin 3. Insulin and Glucagon 4. Cortisol and Testosterone ### Step 3: Identify Lipid-Soluble vs. Water-Soluble Hormones - **Lipid-Soluble Hormones**: These can pass through the lipid bilayer of the cell membrane. Examples include steroid hormones like cortisol and testosterone. - **Water-Soluble Hormones**: These cannot easily pass through the lipid bilayer and usually bind to receptors on the cell surface. Examples include insulin, glucagon, somatostatin, and oxytocin. ### Step 4: Evaluate Each Option 1. **Thyroxine and Insulin**: Thyroxine is lipid-soluble, but insulin is water-soluble. Not both. 2. **Somatostatin and Oxytocin**: Both are water-soluble hormones. Not lipid-soluble. 3. **Insulin and Glucagon**: Both are water-soluble hormones. Not lipid-soluble. 4. **Cortisol and Testosterone**: Both are lipid-soluble hormones. They can easily pass through the cell membrane and bind to internal receptors. ### Step 5: Conclusion Based on the analysis, the correct answer is **Cortisol and Testosterone** (Option D), as they are lipid-soluble hormones that can easily pass through the cell membrane and bind to internal receptors. ### Final Answer **Option D: Cortisol and Testosterone** ---
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