Endocrine System Fundamentals

From the study guide

Endine System Revision Sheet

1. 📌 Essentials

  • The endocrine system regulates physiological functions via hormone secretion into the blood.
  • Endocrine tissues include glands (thyroid, hypophysis cell clusters (Leydig, Langerhans), and diffuse neuroendocrine cells.
  • Hormones are classified as hydrophilic (proteins, peptides, amines) or hydrophobic (steroids, thyroid hormones).
  • Peptide hormones are synthesized as preprohormones, processed in ER and Golgi, stored in granules, secreted by exocytosis.
  • Steroid hormones derive from cholesterol, are not stored, diffuse freely into target cells.
  • Hormone secretion is regulated by hormonal, humoral, neural stimuli, often via negative feedback.
  • Hormone secretion exhibits circadian, pulsatile, or complex rhythms.
  • Receptors: membrane-bound (G-protein, enzyme-linked, ion channels) or intracellular (cytoplasmic, nuclear).
  • Hydrophilic hormones trigger intracellular cascades; lipophilic hormones modulate gene transcription.
  • Disorders include hyposecretion and hypersecretion, primary or secondary.

2. 🧩 Key Structures & Components

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Practice quiz preview

1. What is the primary function of the endocrine system?

2. Which of the following best describes the synthesis and storage of peptide hormones?

3. How do lipophilic hormones such as steroids exert their effects on target cells?

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Flashcard preview

Endocrine epithelia — role?

Vascularized hormone-secreting cell groups.

Hydrophilic hormones — example?

Proteins, peptides, amines like insulin.

Steroid hormones — origin?

Derived from cholesterol, diffuse freely.

Endocrine system — function?

Regulates physiological functions via hormones.

Hydrophilic vs hydrophobic hormones — difference?

Hydrophilic are water-soluble; hydrophobic are fat-soluble.

Peptide hormone synthesis — process?

Synthesized as preprohormones; processed in ER and Golgi.

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The practice quiz has 10 multiple-choice questions, each with an explanation. Use it to check what you know and find your gaps.

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