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Ch. 45 - Hormones and the Endocrine System
Campbell - Campbell Biology 12th Edition
Urry12th EditionCampbell BiologyISBN: 9785794169850Not the one you use?Change textbook
All textbooksUrry 12th EditionCh. 45 - Hormones and the Endocrine SystemProblem 7
Chapter 45, Problem 7

The relationship between the insect hormones ecdysteroid and PTTH is an example of
a. An interaction of the endocrine and nervous systems.
b. Homeostasis achieved by positive feedback.
c. Homeostasis maintained by antagonistic hormones.
d. Competitive inhibition of a hormone receptor.

Verified step by step guidance
1
Identify the roles of ecdysteroid and PTTH in insect physiology. Ecdysteroid is a hormone that promotes molting and metamorphosis in insects, while PTTH (prothoracicotropic hormone) stimulates the production of ecdysteroid.
Understand the interaction between the endocrine and nervous systems. The nervous system can influence the endocrine system by releasing hormones like PTTH, which in turn affects the production of other hormones such as ecdysteroid.
Consider the concept of homeostasis and how it is maintained in biological systems. Homeostasis involves maintaining a stable internal environment, often through feedback mechanisms.
Evaluate the types of feedback mechanisms: positive feedback amplifies changes, while negative feedback reduces them. Determine if the interaction between ecdysteroid and PTTH fits either of these descriptions.
Analyze the options given: a) interaction of the endocrine and nervous systems, b) positive feedback, c) antagonistic hormones, and d) competitive inhibition. Consider which option best describes the relationship between ecdysteroid and PTTH based on their roles and interactions.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Endocrine and Nervous System Interaction

The endocrine and nervous systems interact to regulate physiological processes. The nervous system can trigger hormone release, while hormones can affect neural activity. This interaction is crucial for coordinating complex body functions, such as growth and stress responses, by integrating signals from both systems.
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Endocrine System

Homeostasis and Feedback Mechanisms

Homeostasis refers to the maintenance of a stable internal environment in an organism. Feedback mechanisms, such as positive and negative feedback, are essential for homeostasis. Positive feedback amplifies changes, while negative feedback counteracts them, ensuring that physiological parameters remain within a narrow range.
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Antagonistic Hormones

Antagonistic hormones are pairs of hormones that have opposite effects on physiological processes. This balance helps maintain homeostasis. For example, insulin and glucagon are antagonistic hormones that regulate blood glucose levels, with insulin lowering and glucagon raising glucose concentrations in the blood.
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Related Practice
Textbook Question

What do steroid and peptide hormones typically have in common?

a. Their solubility in cell membranes

b. Their requirement for travel through the bloodstream

c. The location of their receptors

d. Their reliance on signal transduction in the cell

Textbook Question

Which hormone is correctly paired with its action?

a. Oxytocin — stimulates uterine contractions during childbirth

b. Thyroxine — inhibits metabolic processes

c. ACTH — inhibits the release of glucocorticoids by the adrenal cortex

d. Melatonin — raises blood calcium level

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Textbook Question

DRAW IT In mammals, the production of the hormone IGF-1 by the liver is controlled by growth hormone (GH) and GH-releasing hormone. Draw a simple sketch of this pathway, including glands, tissues, hormones, routes for hormone movement, and effects.

Textbook Question

Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal?

a. Greater production of T3 than of T4

b. Hyposecretion of TSH

c. Hypersecretion of MSH

d. A decrease in the thyroid secretion of calcitonin