ANATOMY AND PHYSIOLOGY questions

Question 4:
Martha is a healthy 25 year old, is very concerned about global warming. She, therefore, has decided to leave her car at home and walk as much as possible.

B)Describe what would happen to the amount and type of urine that Martha would produce if she walks 2.5 km to the shops on a hot summer day and forgets to take any fluids with her. Explain the mechanisms involved.