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IB Biology SL C3.1.13 Hypothalamus and Pituitary Control Questions

Explore how hypothalamic inputs regulate pituitary hormones and how endocrine signals control appetite, gonads, adrenals and mammary glands in IB Biology SL C3.1.13.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how hypothalamic hormone signals regulate appetite and homeostasis, using leptin or ghrelin evidence.
  • Identify pituitary hormones such as FSH and explain their regulation of gonadal function through feedback.

IB Biology SL C3.1.13 Hypothalamus and Pituitary Control Questions question 1

[Maximum number: 3]

The graph below shows the levels of hormones during the menstrual cycle.

Figure for Question IB Biology SL C3.1.13 Hypothalamus and Pituitary Control Questions question 1 — IB Biology SL

Question (a)

(a)

Outline the roles of FSH in the menstrual cycle.

[ 2 ]

Question (b)

(b)

FSH is secreted by the pituitary gland. During pregnancy, FSH secretion is inhibited. Suggest how FSH secretion could be inhibited during pregnancy.

[ 1 ]
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