Week 3 Lectorial Questions

Negative feedback systems are a critical component to maintaining the body’s internal environment stable.

• Q1. Explain negative feedback. (50 words or less) (1 mark)

• Q2. State the hormone that controls blood glucose and where is it produced. (1 mark)

• Q3. State the hormone that regulates breast milk and its production (1 mark)

• Q4. Explain the basic mechanism by which membrane impermeable hormones communicate with the cell interior (1 mark)

One of your friends is preparing for an extreme orienteering competition. They are training on an unexpectedly hot humid day in the local reserve when they have to stop and lie down in the shade. They are sweating profusely, complaining of extreme thirst and passing very small volume of dark coloured urine.

• Q5. Why is you friend sweating? Reference homeostasis in your answer. (100 words) (2 marks)

• Q6. Describe physiological mechanism that is making them thirsty. (100 words or less) (2 marks)

• Q7. Describe the physiological mechanism that underlies small volume of dark urine (100 words or less) (2 marks)