International A Level Biology / Control of the internal environment

ADH and the control of plasma concentration revision notes

Edexcel International A Level Biology (YBI11), chapter 22: Control of the internal environment, specification point 7.21. Part of the full course.

Watch the video lesson · International A Level Biology past papers

ADH helps keep the water potential of blood plasma near normal by changing how much water the collecting ducts reabsorb. This is controlled by negative feedback, so the response reduces the original change.

More lessons in Control of the internal environment

• How hormones switch genes on and off
• The gross and microscopic structure of the kidney
• Urea production and ultrafiltration
• Selective reabsorption in the proximal tubule
• The loop of Henle as a countercurrent multiplier
• Homeostasis and thermoregulation during exercise