Principles Of Homeostasis Flashcards
Learn principles
What is homeostasis?
The maintenence of an internal environment within restricted limits in organisms.
What does homeostasis ensure?
That the cells of the body are in an environment that meets their requirements and allows them to function.
What does homeostasis occur around?
An optimun point. Homeostasis is the ability to return to that optimum point and so maintain organisms in a balenced equilibrium.
Why is homeostasis important?
Enzymes and proteins like channel proteins are sensitive to changes in temperature and pH. We don’t want them to denature.
Water potential of the blood and tissue fluids need to stay at an optimum because if they don’t cells can drink or expand and we need a const
Why is homeostasis important?
Enzymes and proteins like channel proteins are sensitive to changes in temperature and pH. We don’t want them to denature.
Water potential of the blood and tissue fluids need to stay at an optimum because if they don’t cells can drink or expand and we need a const
Why is homeostasis important?
Enzymes and proteins like channel proteins are sensitive to changes in temperature and pH. We don’t want them to denature.
Water potential of the blood and tissue fluids need to stay at an optimum because if they don’t cells can drink or expand and we need a const
What is the cause of type 1 diabetes?
In type 1 diabetes, the immune system attacks the beta cells in the islets of langerhans so they can’t produce any insulin. Type 1 diabetes is treated with insulin therapy.
What is type 2 diabetes?
It occurs when the beta cells don’t produce enough insulin or when the body’s cells don’t respond to insulin.
Why don’t the receptor cells in someone who is type 2 diabetic respond to the insulin they create?
Glycoprotein receptors on body cells are lost or loosing their responsiveness. So their are less receptors on cell membrain so their is fewer glucose transport proteins and less glucose can enter the cell meaning less glucose gets converted into glycogen so when the blood glucose is to high the body can not lower it.
Suggest one way in which the insulin receptor cells might be abnormal
Different shape or tertiary structure
Explain how the kidneys normaly prevent glucose appearing in the urine of a non diabetic person
Glucose is reabsorbed into the blood from the proximal tubule via active transport
Where is adrenaline produced
The adrenal glands
What does GLUCAGON cause?
gluCAgon causes liver cells to convert glyCOgen to glucose. The glucagon was realised by the a cells after wtheir receptors detected the drop in glucose levels.
Describe the role of the hormone glucagon in the control of blood glucose control
Glucagon is released by alpha cells in the islets of langerhans. Glucagon binds to the specific receptors on the liver /muscle and activates enzymes that cause the hydrolosis of glycogen into glucose. Facilitated diffusion of glucose out of he liver into the blood causes the blood glucose levels to increase.
Explain the shape of the curve in the loop of henle?
The consentration rises at the descending limb because sodium ions are entering and water is moving out of the limb. In the as sending limb the consentration decreases because the sodium is being actively removed and the water isn’t able to move out of the limb because the as sending limb is inpermuabe to water.
