Communication and Homeostasis (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
Which type of feedback is most commonly used in homeostatic systems throughout the body?
Which type of feedback is most commonly used in homeostatic systems throughout the body?
Negative feedback
What does negative feedback do when a deviation from normal occurs?
What does negative feedback do when a deviation from normal occurs?
Triggers responses that counteract it
What does negative feedback automatically lead to?
What does negative feedback automatically lead to?
Control and stabilisation
What does positive feedback cause in a physiological system?
What does positive feedback cause in a physiological system?
Amplification rather than regulation
Is positive feedback involved in maintaining homeostasis?
Is positive feedback involved in maintaining homeostasis?
No, it is not involved
How do positive feedback loops terminate?
How do positive feedback loops terminate?
An external factor stops them
What does oxytocin do during childbirth?
What does oxytocin do during childbirth?
Intensifies uterine contractions
What terminates the oxytocin positive feedback loop during childbirth?
What terminates the oxytocin positive feedback loop during childbirth?
Birth itself
Why is positive feedback unsuitable for homeostasis?
Why is positive feedback unsuitable for homeostasis?
It creates instability not stability
In the thyroid control system, what do thyroid hormones inhibit?
In the thyroid control system, what do thyroid hormones inhibit?
TRH production in hypothalamus