Ch. 16 - The Endocrine SystemSee all chapters
All Chapters
Ch. 1 - Introduction to Physiology
Ch. 2 - Molecules and Molecular Interactions
Ch. 3 - Cells and Tissues
Ch. 4 - Cell Metabolism: Bioenergetics, Enzymes, and Respiration
Ch. 5 - Membrane Dynamics
Ch. 6 - Cell Communication
Ch. 7 - Integumentary System
Ch. 8 - Bone and Cartilage
Ch. 9 - Skeletal System
Ch. 10 - Joints
Ch. 11 - Muscles
Ch. 12 - The Nervous System I: Neurons and Neuronal Networks
Ch. 13 - The Nervous System II: The Central Nervous System
Ch. 14 - The Autonomic Nervous System
Ch. 15 - Sensory Physiology
Ch. 16 - The Endocrine System
Ch. 17 - Cardiovascular Physiology I: The Heart
Ch. 18 - Cardiovascular Physiology II: Blood, Blood Vessels, Circulation, and Exchange
Ch. 19 - The Urinary System
Ch. 20 - Respiratory Physiology
Ch. 21 - Acid-Base Balance-- Controlling Blood pH
Ch. 22 - Introduction to the Immune System
Ch. 23 The Lymphatic System
Ch. 23 - The Digestive System
Ch. 24 - Regulation of Metabolism and Energy Balance
Ch. 25 - Human Sexual Reproduction and Development

Hormone Classification and Mechanism of Action

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Concept #1: Structural Classifications of Hormones

Concept #2: Mechanism of Action of Catecholamines and Proteins

Concept #3: Mechanism of Action of Steroids and Thyroid Hormone

Practice: A 20-year-old college student looks across a lecture hall and makes eye contact with a beautiful girl. She smiles at him—a stunning, luminous, mesmeric smile. Time slows. He falls in love immediately. During this brief period of excitement, his heart rate increases. Which of the following class of hormones likely mediated this sudden increase in heart rate?

Practice: A 12-year-old male notices that his body is changing. Specifically, he’s noticed that, over the past year or so he’s started growing hair under his arms, around his genitals, and on his upper lip. Over the coming year he notices that his voice deepens and that he has a tendency to get sudden, often unwanted erections. Which of the following class of hormones is likely mediating this steady cascade of changes in his physiology?

Practice: Anti-Diuretic hormone (ADH) is a hormone released from the anterior pituitary. It binds to receptors on the surface of kidney collecting duct cells. Which of the following correctly identifies both the likely hormone class to which ADH belongs and the time course on which it acts?

Practice: Cortisol is a hormone released from the adrenal cortex. It binds to intracellular receptors in cells throughout the body. Which of the following correctly identifies both the likely hormone class to which cortisol belongs and the time course on which it acts?