Free Chemical Coordination and Hormones MCQs with Answers
14 Chemical Coordination and Hormones MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
14 questions · page 2 of 2
11. Steroid hormones act by
- A. Binding cell surface receptors
- B. Binding intracellular receptors
- C. Opening ion channels
- D. Activating second messengers
Explanation: Steroid hormones (lipid-soluble) diffuse through membranes and bind intracellular receptors that regulate gene transcription.
Correct answer: Binding intracellular receptors12. Type 1 diabetes is caused by
- A. Insulin resistance
- B. Autoimmune destruction of beta cells
- C. Excess insulin
- D. Pituitary tumor
Explanation: Type 1 diabetes is an autoimmune disease where beta cells are destroyed, requiring insulin injections.
Correct answer: Autoimmune destruction of beta cells13. Calcitonin lowers blood calcium by
- A. Increasing bone resorption
- B. Decreasing bone resorption
- C. Increasing calcium absorption
- D. Decreasing calcium excretion
Explanation: Calcitonin from the thyroid inhibits osteoclasts, decreasing bone resorption and lowering blood calcium.
Correct answer: Decreasing bone resorption14. The stress hormone adrenaline causes all EXCEPT
- A. Increased heart rate
- B. Bronchodilation
- C. Glycogenolysis
- D. Decreased blood pressure
Explanation: Adrenaline increases (not decreases) blood pressure through vasoconstriction and increased cardiac output.
Correct answer: Decreased blood pressure