Problem 137 - Objective Biology for NEET

Question

Assertion: Adrenal cortex can be removed without causing death. Reason: Adrenal cortex is not vital for survival.

Step-by-Step Solution

Answer

The assertion that the adrenal cortex can be removed without causing death is true with medical intervention. However, the reason stating it is not vital for survival is partially correct as the absence of adrenal cortex needs medical compensation.

Step 1: Understand the Functions of Adrenal Cortex

The adrenal cortex, located on top of the kidneys, has numerous essential roles in the body. It produces vital hormones such as cortisol, which aids in stress responses, and aldosterone, which assists in controlling blood pressure and electrolyte balance.

Step 2: Analyzing the Importance of the Adrenal Cortex

While life can be sustained without an adrenal cortex, the lack of these essential hormones will require lifelong hormone replacement therapy. Therefore, it is not completely correct to say that the adrenal cortex is not vital for survival.

Step 3: Conclusion Based on Analysis

The statement that the adrenal cortex can be removed without causing death is true, but with conditions. It requires hormone replacement therapy to compensate for the loss of vital hormones. The reason given that the adrenal cortex is not vital for survival is partially correct, as life without it is complex and requires medical intervention.

Key Concepts

Cortisol

Located in the adrenal cortex, cortisol plays a crucial role in managing stress in the body. When you're stressed, your adrenal cortex releases cortisol to help your body react to the situation. It boosts energy by releasing stored glucose, so you have the fuel you need for your fight-or-flight response.
Additionally, cortisol helps regulate metabolism, reduce inflammation, and control blood sugar levels. It works together with other hormones to keep your body's internal balance constant, also known as homeostasis.
The levels of cortisol in your body aren't constant. They fluctuate throughout the day, usually peaking in the morning to help you wake up and gradually decreasing by evening. This daily cycle is called your circadian rhythm.

• Stress response regulator
• Influences metabolism and glucose release
• Supports immune function by managing inflammation

Understanding cortisol is essential because an imbalance, either too much or too little, can lead to problems such as Cushing's syndrome or Addison's disease. Adequate hormone replacement therapy can address these issues if your adrenal cortex can't produce enough cortisol naturally.

Aldosterone

Aldosterone is another hormone secreted by the adrenal cortex. It mainly helps maintain your blood pressure by balancing sodium and potassium in your blood. This hormone signals the kidneys to absorb more sodium and water, which increases blood volume and subsequently raises blood pressure.
Maintaining blood pressure is crucial for making sure all your organs get the oxygen they need through blood circulation. Aldosterone also helps maintain the right pH balance in your blood by managing electrolytes. If your body lacks aldosterone, you might experience low blood pressure and an imbalance of key minerals.

• Regulates sodium and potassium levels
• Crucial for maintaining blood pressure
• Supports overall electrolyte balance

Just like with cortisol, inadequate production of aldosterone will mean resorting to hormone replacement therapy to maintain essential bodily functions.

Hormone Replacement Therapy

When the adrenal cortex is removed or fails to produce necessary hormones, hormone replacement therapy (HRT) becomes a life-saver. Through HRT, synthetic hormones can be taken to replace what the adrenal cortex naturally produces.
This therapy is personalized based on the specific hormones that aren't naturally being produced and is often long-term. For cortisol, the replacement might be in the form of hydrocortisone or another synthetic glucocorticoid. For aldosterone, the therapy often involves fludrocortisone, a synthetic mineralocorticoid.
It's vital for people undergoing this therapy to have regular medical check-ups to ensure the hormone levels remain balanced. Monitoring involves adjusting doses based on stress levels, physical activity, and other factors that affect hormone needs.

• Compensates for lack of natural hormone production
• Is personalized and often long-term
• Requires regular medical monitoring

Hormone replacement therapy makes survival possible without an adrenal cortex by replicating its key functions, proving that while the cortex might not be essential, its hormonal functions certainly are critical for a normal life.