Its all printed in the Appendix of the course booklet p51,59 . Pills and supplements are a significant factor . Vitamin includes the word 'organic' in its definition. To demonstrate your understanding state that in the sudden exposure to cold, the skin will be cooler but the core temp. Therefore the physiological response must be stimulated by the peripheral thermoreceptors.
Impulses pass through sensory sytem to both hypothalamus and cerebral cortex.
Thyroid not involved. Non-shivering thermogenesis is small in adults. If you choose to answer this type of 'vague' question, then you must produce a well constructed essay which is written in good English. Random jottings and 'short notes' get you little credit. Ca induced Ca release is really an amplification process, not true feedback.