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Chapter 17: Problem 9

Knowing what you do about the feedback effects of testosterone on the anterior pituitary gland, explain the reason that male athletes who take anabolic steroids become temporarily sterile (anabolic steroids are steroids that mimic some actions of testoeterone).

Short Answer

Expert verified
Anabolic steroids mimic testosterone and when taken in large amounts, the body responds by decreasing natural testosterone production through hormonal feedback mechanisms. Since testosterone is necessary for sperm production, reduced production due to steroid use can result in temporary sterility.

Step by step solution

01

Understand Hormonal Feedback Mechanisms

The human body uses hormonal feedback mechanisms to keep internal systems balanced. When the level of a certain hormone in the body is high, the brain responds by reducing the production of that hormone. This relationship is usually governed by the hypothalamus and the pituitary gland in the brain. In the context of testosterone, when the levels are high, the hypothalamus inhibits the secretion of gonadotropin-releasing hormone (GnRH), which, in turn, reduces the production of luteinizing hormone (LH) by the pituitary gland.
02

Understand Role of Testosterone in Feedback Mechanism

LH stimulates the release of testosterone by the testes. So, as levels of testosterone rise, the anterior pituitary gland receives feedback to decrease LH production, subsequently, decreasing testosterone production. This feedback loop is crucial for maintaining the appropriate level of testosterone needed for sperm production.
03

Understand the Impact of Anabolic Steroids

Anabolic steroids mimic the effects of testosterone. When taken in high amounts by male athletes, the body reacts to the increased level of 'testosterone' by triggering the feedback mechanism to reduce testosterone production. This effectively decreases the amount of natural testosterone produced by the body and subsequently, sperm production, thus leading to temporary sterility.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Anterior Pituitary Gland
The anterior pituitary gland plays a pivotal role in the hormonal orchestra of the human body. Think of it as a master conductor, controlling various biological functions by secreting essential hormones.

One of its key roles involves regulating reproductive activities. It secretes luteinizing hormone (LH), which is crucial for testosterone production in males. The pituitary gland's activity is part of a delicate system maintained by hormonal feedback loops, ensuring that hormone levels remain within a balanced range.
Testosterone
Testosterone is the principal male sex hormone, strutting through the body with several responsibilities. It fosters characteristics like muscle mass, deep voice, and facial hair; beyond these, it's vital for producing sperm.

When testosterone levels are high, the body cleverly adjusts to keep its internal environment stable. This involves sending a signal to the anterior pituitary gland to throttle back LH production, effectively reigning in testosterone levels and maintaining balance.
Anabolic Steroids
Anabolic steroids are synthetic variations of testosterone designed to promote muscle growth and enhance athletic performance. Imagine someone turning up the volume on testosterone's effects.

This increase in manufactured muscle-building heroes tricks the feedback mechanism into thinking that testosterone levels are sufficiently high, which instructs the anterior pituitary gland to pump the brakes on natural testosterone secretion, ironically causing a decrease in sperm production.
Gonadotropin-releasing Hormone (GnRH)
The gonadotropin-releasing hormone (GnRH) is like a director that prompts the anterior pituitary gland when to 'take action'. Naturally produced by the hypothalamus, GnRH kickstarts the production of LH.

In this complex hormonal dance, whenever there's too much testosterone showing off, GnRH takes a step back, lowering the production of LH, and as a result, the production of testosterone itself. It's the body's way of maintaining a hormonal equilibrium.
Luteinizing Hormone (LH)
Luteinizing hormone acts as a key to unlocking testosterone production in the testes. It's essentially given the task to head down to the testes and say, 'Hey, let's get some testosterone going!'

Fluctuations in LH directly influence the testes' ability to pump out testosterone. When LH is dialed down due to the feedback loop process, testosterone production slows, impacting the entire reproductive system, including sperm production.
Sperm Production
To understand the road to temporary sterility, it's crucial to unpack sperm production. Testosterone isn't just about bulging muscles and deep voices; it's a fundamental cogs in the machine of sperm generation.

The balance of testosterone is vital for healthy sperm production. If any component of the hormonal feedback loop that regulates testosterone is thrown off鈥攕ay, by an influx of anabolic steroids鈥攕perm production can come to a screeching halt, ushering in temporary sterility.
Temporary Sterility
Temporary sterility in the context of anabolic steroid use is a bit like a hormonal circuit breaker. When fake testosterone enters the scene, the feedback loop interprets it as an excess and tells the body to stop making its own jazz.

This results in a reduction of natural testosterone and, by extension, a drop in sperm production. It's a paradoxical moment where athletes seeking strength inadvertently flick off the switch on their fertility, albeit temporarily until the hormonal balance is restored.

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Most popular questions from this chapter

Ovulation in mammals occurs in response to a surge of luteinizing hormone (LH). whether it is incluced or spontanecus. Compare and contrast the ways the LH surge is generated in induced and spontanecus onulators.

In discussions of feedback in biological systems, negative feedback is typically emphasized, and positive feedback is often treated as an anomaly. In fact, positive feedback is common in reproductive physiology. List two or three examples of positive feedback. Explain how positive feedback functions to advantage in each case. If possible, discuss whether homeostasis is always ideal.

Aromatase inhibitors are a new generation of drugs used to treat women who have estrogen-sensitive breast cancers (cancers that grow most rapidly when estrogen is present). Explain why aromatase inhibitors are useful in these cases.

Consider a species, such as a lizard, in which females produce sets of eggs with large, heavy quantities of yolk. Suppose you hypothesize that one of the costs of reproduction is that females cannot run as fast or escape predators as well when they are in the process of producing such eggs. Describe a manipulative experiment you could carry out to test your hy pothesis, and explain how you would interpret your results. (For an example, see the paper by Miles et al. in the References.)

In discussions of feedback in biclogical systems, negative feedback is typically emphasized, and positive feedback is often treated as an anomaly. In fact, positive feedback is common in reproductive physiology. List two of three examples of pooitive feedback. Explain how positive feedback functions to advantage in each case. If possible, discuss whether homeostasis is always ideal.
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