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Ch. 45 - Hormones and the Endocrine System
Chapter 45, Problem 4

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
Table listing hormones and their functions in the endocrine system for biology course.

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Key Concepts

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

Hormonal Functions

Hormones are chemical messengers produced by glands in the endocrine system that regulate various physiological processes in the body. Each hormone has specific functions, such as regulating metabolism, growth, and reproductive processes. Understanding the role of each hormone is crucial for identifying their correct actions and interactions within the body.
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Oxytocin

Oxytocin is a hormone produced by the hypothalamus and released by the posterior pituitary gland. It plays a significant role in childbirth by stimulating uterine contractions during labor. Additionally, oxytocin is involved in social bonding and emotional responses, making it essential for maternal behaviors and attachment.
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Endocrine Feedback Mechanisms

The endocrine system operates through feedback mechanisms that regulate hormone levels and maintain homeostasis. For instance, the release of hormones can be stimulated or inhibited based on the body's needs, such as stress or metabolic demands. Understanding these feedback loops is vital for comprehending how hormones like ACTH and thyroxine function in the body.
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Related Practice
Textbook Question
Which statement is accurate? (A) Hormones that differ in effect reach their target cells by different routes through the body. (B) Pairs of hormones that have the same effect are said to have antagonistic functions. (C) Hormones are often regulated through feedback loops. (D) Hormones of the same chemical class usually have the same function
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Textbook Question

The hypothalamus a. synthesizes all of the hormones produced by the pituitary gland. b. influences the function of only one lobe of the pituitary gland. c. produces only inhibitory hormones. d. regulates both reproduction and body temperature.

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Textbook Question

Growth factors are local regulators that a. are produced by the anterior pituitary. b. are modified fatty acids that stimulate bone and cartilage growth. c. are found on the surface of cancer cells and stimulate abnormal cell division. d. bind to cell-surface receptors and stimulate growth and development of target cells.

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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

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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

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Textbook Question

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.

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