Coordination And Control: Blood Glucose Control
14.6 Blood Glucose Control
Need For Control
- Cells need steady glucose supply for respiration.
- Too much glucose → damages tissues, osmotic imbalance.
- Too little glucose → not enough energy, fainting.
Organs Involved
- Pancreas → produces insulin and glucagon.
- Liver → stores glucose as glycogen, or breaks glycogen down to glucose.
Hormones And Actions
| Hormone | Released When | Action | Effect |
|---|---|---|---|
| Insulin | Blood glucose too high | Converts glucose → glycogen (in liver & muscle) | Lowers blood glucose |
| Glucagon | Blood glucose too low | Converts glycogen → glucose (in liver) | Raises blood glucose |
Written And Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions And 11 World Records For Educate A Change O Level And IGCSE Biology Full Scale Course
Diabetes (Type 1)
- Caused by failure of pancreas to produce insulin.
- Symptoms: high blood glucose, glucose in urine.
- Treatment: insulin injections, controlled diet.
Key Points
- Blood glucose controlled by negative feedback.
- Insulin and glucagon act as antagonistic hormones.
- Healthy range must be maintained for normal metabolism.
Written And Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions And 11 World Records For Educate A Change O Level And IGCSE Biology Full Scale Course