Question

After a long, hot soccer practice, Joy is thirsty so she grabs her water bottle and takes a long drink. What type of feedback loop is occurring in Joy's body as the water quenches her thirst?
A. A positive loop that regulates thirst with hydration balance
B. A positive loop that reduces urine production
C. A negative loop that regulates water levels in the blood
D. A negative loop that regulates sweat and hydration balance

Answer 1

C. This is a negative feedback loop — osmolarity/volume sensors in the hypothalamus trigger thirst when blood water is low, drinking restores water balance and reduces the thirst signal.