Homeostasis~

• Homeostasis is the maintenance of a constant internal environment to keep conditions at an optimum.
• The two conditions inside the body that must be carefully controlled to ensure the body's metabolism works properly are temperature and pH.
• Hormones are chemical messengers that are produced in the endocrine glands.
• Hormones are a chemical messenger.

  They are carried by the blood.

  Their speed of transmission are slow.
• Nervous system is an electrical impulse.

  They are carried by the Neurones.

  They are fast.
• All hormones go to the liver.
• The hormone that regulates blood sugar levels is insulin.
• Our body cells need glucose sugar for aerobic respiration.
• The endocrine gland that produces insulin is the pancreas.
• The blood glucose levels rise when we eat.
• The part of the body that absorbs glucose is the liver.
• When our blood sugar levels rise the pancreas detects this.
• When the pancreas detects that the blood sugar has risen too high, it will secrete insulin and it will travel in the blood to the liver.
• When the insulin gets to the liver, the liver will convert the excess glucose and convert it into insoluble glycogen and store it.
• When the liver has done this the pancreas will stop secreting insulin.
• The pancreas will detect if the blood sugar levels have dropped too low and will release glucagon.
• The glucagon will then travel through the blood to the liver. Then, the liver will convert the insoluble glycogen back into glucose.
• When the blood sugar levels have risen back up to normal, the pancreas will stop secreting glucagon.
• The type of feedback mechanism that this is an example of is negative feedback.