homeostasis and negative feedback

Question 1

functioning

Answer 1

• for proper functioning, internal environment must remain constant
• this is homeostasis

Question 2

how

Answer 2

• detects any change and counteracts it

- negative feedback

Question 3

negative feedback

Answer 3

• control mechanisms that returns certain deviations and changes in the internal environment, bringing them back in the opposite (negative) direction
• receptor (detects the change, usually brain)
• control centre (processes the information and activates the right and certain mechanisms to correct the change sending them to the effector)
• effector (responds and corrects the change / deviation returning the conditions to their original states)
• negative feedback = receptors > control centre > effectors

Question 4

regulation of glucose

Answer 4

• beta cells detect change
• release insulin
• makes cells (liver and muscle) more permeable to glucose and can therefore convert more into glycogen
• detected by insulin secreting cells when blood sugar is lowered and they stop secretion
• alpha cells detect a change
• release glucagon
• glycogen converted back into glucose
• receptor : pancreatic cells
• message via glucagon / insulin
• effector : liver