Biology Practice: Endocrine System (Mock Test 3 - Advanced Mechanisms)
1. The 'Feedback Mechanism' of the body ensures that hormones are secreted in precise quantities. If blood sugar levels rise, which sequence occurs?
2. Which hormone acts on the renal tubules to increase the reabsorption of water, thereby concentrating the urine?
3. Why is the Pancreas referred to as a 'Dual Gland' or 'Heterocrine Gland'?
4. The condition 'Diabetes Insipidus' is marked by huge loss of water in urine. This is caused by the deficiency of:
5. Which hormone is responsible for the 'calcium-stripping' effect from bones to increase blood calcium levels?
6. 'Addison's Disease' is characterized by skin pigmentation and low blood pressure. It is caused by the hyposecretion of:
7. The 'LH Surge' (Luteinizing Hormone) is critical in the female reproductive cycle because it directly triggers:
8. What is the metabolic function of 'Glucagon' secreted by the Alpha cells of the Pancreas?
9. Which of the following is a symptom of 'Cretinism' in infants?
10. The 'Adrenal Medulla' is considered an extension of the sympathetic nervous system because it secretes:
11. A woman has difficulty in lactating (producing milk) after childbirth. Which pituitary hormone might be deficient?
12. Why does a deficiency of Thyroxine cause a person to feel cold and lethargic?
13. The hormone 'Aldosterone' helps in maintaining the 'Salt-Water' balance by reabsorbing ________ ions from kidney tubules.
14. Which gland acts as the link between the 'Nervous System' and the 'Endocrine System' by controlling the Pituitary gland?
15. The 'Acromegaly' condition, characterized by overgrowth of bones in the face, hands, and feet, occurs when Growth Hormone is over-secreted in:
16. Which hormone is the antagonist (acts opposite) to Parathormone (PTH)?
17. In the 'Islets of Langerhans', Delta cells secrete Somatostatin which functions to:
18. 'Tetany' (sustained muscle contraction) is a clinical condition resulting from the deficiency of:
19. Why does the 'Thymus' gland gradually decrease in size after puberty?
20. The 'Posterior Lobe' of the Pituitary gland does not actually produce hormones; it only stores and releases those made by the:
