Identify the variable and deviation, trace receptor and effector responses back toward the set range and distinguish amplification when the response reinforces change.
The scientific article you have studied is adapted from an article in Clinical Nutrition entitled Muscle tissue changes with aging (July 2004). Use the information from the scientific article and your own knowledge to answer the following questions.
Insulin control of blood glucose is an example of a negative feedback loop (paragraph 7). Explain how negative feedback can maintain a system within a narrow limit.
An explanation that includes the following points:
- change in condition is detected by a receptor (1)
- stimulating an effector that counteracts the change (1)
e.g. \{high / low\} blood glucose levels detected by (chemo)receptor
e.g.
pancreas stimulated to release insulin which results in \{lower blood glucose / glucose being converted to glycogen\}
insulin released which results in \{lower blood glucose / glucose being converted to glycogen\}
pancreas releases glucagon which results in \{increase in blood glucose\} / glycogen being converted to glucose\}
glucagon released\} which results in \{increase in blood glucose\} / glycogen being converted to glucose\}