Which type of hormone usually binds to a receptor on the cell membrane and activates a second-messenger system?
Correct answer: A. Peptide hormone
- A. Peptide hormone
- B. Steroid hormone
- C. Thyroid hormone
- D. Adrenal cortical hormone
Explanation
Peptide hormones are water soluble and usually cannot cross the lipid cell membrane, so they act through membrane receptors and second messengers. Steroid and thyroid hormones generally enter cells and act through intracellular receptors.
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About Endocrine System
The endocrine system covers hormone-producing glands including the pituitary, thyroid, parathyroids, adrenals, pancreas, pineal gland, ovaries and testes. It explains hormone classes, target-cell responses, feedback control, and the functions of hormones such as insulin, thyroxine, cortisol, growth hormone and ADH, which is often confused with a kidney-produced substance.
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