Which of the following statements concerning hormonal transport is true?
Correct answer: B. Pancreatic hormones are able to move freely through the bloodstream
- A. The thyroid hormones are able to move freely in the bloodstream
- B. Pancreatic hormones are able to move freely through the bloodstream
- C. All hormones require chylomicrons in order to move through the bloodstream
- D. Steroid hormones are able to move freely through the bloodstream
Explanation
The correct answer is B) Pancreatic hormones are able to move freely through the bloodstream, specifically referring to Insulin and Glucagon, which are water-soluble (peptide) hormones that do not require carrier proteins to be transported through the water-based blood plasma. Options A and D are wrong because thyroid hormones and steroid hormones are lipid-soluble and are mostly (over 99% for thyroid hormones) bound to transport proteins like globulins and albumin in the blood, with only a small "free" fraction being biologically active. Option C is also wrong, as chylomicrons primarily transport dietary lipids like triglycerides, not all hormones.
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About Chemical Coordination and Hormones
Chemical coordination uses hormones released by endocrine glands and carried in blood to specific target cells. Coverage includes the pituitary, thyroid, pancreas, adrenal glands, ovaries and testes, feedback control, and the contrast between slower, longer-lasting hormonal responses and rapid nervous coordination.
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