5.1.1: Communication And Homeostasis Flashcards
What is homeostasis?
The maintenance of a constant internal environment via physiological control systems.
What parameters are kept within set limits by homeostasis?
Body temperature, blood pH, blood glucose, and blood water potential.
What types of feedback loops are involved in homeostasis?
Negative and positive feedback loops.
What is negative feedback?
A mechanism that restores conditions back within set limits after a deviation is detected.
What triggers negative feedback in the body?
A deviation from set limits detected by a receptor.
Give an example of a negative feedback mechanism in the body.
The release of insulin in response to a rise in blood glucose levels.
What is the role of the nervous system in negative feedback?
It is involved in detecting deviations and coordinating responses.
What is the stimulus in the negative feedback loop for body temperature regulation?
Body temperature exceeds 37°C.
What sensors are involved in temperature regulation?
Nerve cells in the skin and brain.
What is the control center for temperature regulation in the body?
The temperature regulatory center in the brain.
What is the effector in the negative feedback loop for body temperature?
Sweat glands throughout the body.
What is positive feedback?
A response that increases the deviation from set limits.
Give an example of positive feedback in the body.
The release of oxytocin during childbirth when the baby’s head presses on the cervix.
True or False: Positive feedback systems are common in the body.
False.
What effect does oxytocin have during childbirth?
It causes the uterus to contract.
What is the result of uterine contractions during childbirth?
The release of even more oxytocin.
