All Human Anatomy and Physiology Resources
Example Questions
Example Question #11 : Help With Hormone Origins And Targets
Steroid hormones are synthesized from which molecule?
Cholesterol
Deoxyribose
Tyrosine
Cortisol
Cyclooxygenase
Cholesterol
Steroid hormones are synthesized from cholesterol. The amine hormones are synthesized from the amino acid tyrosine. Cortisol is an example of a steroid hormone, and is not a precursor for the synthesis of other steroid hormones.
Example Question #12 : Help With Hormone Origins And Targets
Match the following adrenal layer to the correct secretory product.
Medulla; androgens
Zona fasciculata; aldosterone
Zona glomerulosa; aldosterone
Zona reticularis; catecholamines
Medulla; aldosterone
Zona glomerulosa; aldosterone
The following are appropriate matches of adrenal layers to their corresponding secretory products: zona glomerulosa; aldosterone, zona fasciculata; cortisol and minor amount of androgens, zona reticularis; androgens, medulla; catecholamines. The layers of the adrenal glands, from superficial to deep are: capsule, zona glomerulosa, zona fasciculata, zona reticularis, medulla.
Example Question #13 : Help With Hormone Origins And Targets
Which of the following is not a response due to increased levels of parathyroid hormone?
Increased calcium absorption in the intestines
Increased production of 25-hydroxyvitamin D3
Decreased levels of calcium in the blood
Increased osteoclast activity
Increased absorption of calcium in the renal tubule
Decreased levels of calcium in the blood
Parathyroid hormone (PTH) is released when blood calcium levels are low, and functions to raise blood calcium levels via a negative feedback mechanism. It does this by increasing osteoclast activity and degrading bone to release calcium into the blood. It also increases absorption of calcium in the renal tubule, increases production of 25-hydroxyvitamin D3, and increases absorption of calcium in the intestines.
Certified Tutor
Certified Tutor
All Human Anatomy and Physiology Resources
![Learning Tools by Varsity Tutors](https://vt-vtwa-app-assets.varsitytutors.com/assets/problems/og_image_practice_problems-9cd7cd1b01009043c4576617bc620d0d5f9d58294f59b6d6556fd8365f7440cf.jpg)