An example could be glucose levels in the blood. If they rise, you will negatively feedback and lower them to normal levels thus maintaining homeostasis. Another example of negative feedback is the thermostat in a house. If it gets too cold, the heater will negatively feedback and warm the house. Malfunctions of the Endocrine system Go Here Plants Plants do not have a nervous system but regulate metabolism through the secretion of hormones.
Tropisms are the ability to grow toward or away from some specific stimulus.
This elongates the dark side of the stem of the plant and allows it to grow bending toward the light. See pages 57-59 in your review book for some really good pictures. Open Ended Questions 1. List two pancreatic hormones. List two similarities between the nervous and endocrine systems.