Problem 2 - Campbell Biology Concepts & Connections

Question

Which correctly matches a hormone to the gland from which it is produced and to its effect on target cells? a. thyroid hormone: anterior pituitary, regulates metabolism b. prolactin: anterior pituitary, raises blood calcium levels c. androgens: thyroid, promotes male characteristics d. None of the choices are correct.

Step-by-Step Solution

Answer

d. None of the choices are correct.

Step 1: Analyze Option a

Check if the thyroid hormone is produced by the anterior pituitary and if it regulates metabolism. Thyroid hormones (T3 and T4) are actually produced by the thyroid gland, not the anterior pituitary, and they do regulate metabolism. Hence, this option is incorrect on the gland part.

Step 2: Analyze Option b

Check if prolactin is produced by the anterior pituitary and if it raises blood calcium levels. Prolactin is indeed produced by the anterior pituitary, but its primary function is to promote milk production in mammals, not to raise blood calcium levels. Thus, this option is incorrect with respect to its effect on target cells.

Step 3: Analyze Option c

Check if androgens are produced by the thyroid and if they promote male characteristics. Androgens are actually produced by the adrenal glands and the testes, not the thyroid gland. Their function is to promote male characteristics. Therefore, this option is incorrect on the gland part.

Step 4: Evaluate Option d

Since none of the first three options are correct, the only remaining possibility is that none of the choices provided are correct.

Key Concepts

hormones

Hormones are the body's chemical messengers. They travel through the bloodstream to tissues and organs, affecting various bodily functions such as growth, metabolism, and mood. Hormones are produced by glands, which are part of the endocrine system. Each hormone has a specific function and targets certain cells or organs. For example, thyroid hormones (T3 and T4) regulate metabolism, while insulin controls blood sugar levels. Understanding hormones is crucial because they play a vital role in maintaining homeostasis, or balance, within the body.

glands

Glands are specialized organs that produce and release hormones. There are several types of glands in the endocrine system, each with its own unique functions.
The key endocrine glands include:

• Thyroid Gland: Produces hormones that regulate metabolism, such as T3 and T4.
• Anterior Pituitary: Produces a variety of hormones, including prolactin, which promotes milk production.
• Adrenal Glands: Produce androgens, which promote male characteristics, as well as other hormones like cortisol.
• Testes: Produce testosterone, another hormone crucial for male characteristics.

Each gland works together with others to ensure the body functions smoothly. Misunderstanding the function and origin of these hormones can lead to incorrect assumptions about their effects on the body, as seen in the exercise.

metabolism

Metabolism refers to the chemical processes that occur within a living organism to maintain life. These processes include converting food to energy, building and repairing tissues, and removing waste products. Hormones play a significant role in regulating metabolism. For example, thyroid hormones (T3 and T4) are critical for controlling the rate at which your body uses energy.
Key points about metabolism include:

• Anabolism: The process of building up complex molecules from simpler ones, often requiring energy.
• Catabolism: The breakdown of complex molecules into simpler ones, releasing energy.
• Basal Metabolic Rate (BMR): The rate at which the body uses energy while at rest to keep vital functions going, such as breathing and keeping warm.

Understanding metabolism is essential for comprehending how the body utilizes food and nutrients to support life and maintain health.