Homeostasis and Feedback Mechanisms Practice

Front

What is homeostasis?

Back

Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions.

Front

What is a feedback loop?

Back

A feedback loop is a biological mechanism in which the output of a system influences its own operation, often to maintain homeostasis.

Front

What is negative feedback?

Back

Negative feedback is a process that counteracts a change in a system, helping to return it to its set point or normal range.

Front

What is positive feedback?

Back

Positive feedback is a process that amplifies a change in a system, leading to an even greater change, often until a specific event occurs.

Front

Give an example of negative feedback in the human body.

Back

An example of negative feedback is the regulation of blood glucose levels: when blood sugar rises, insulin is released to lower it.

Front

Give an example of positive feedback in the human body.

Back

An example of positive feedback is childbirth: the release of oxytocin increases contractions, which leads to more oxytocin being released.

Front

What role do receptors play in feedback mechanisms?

Back

Receptors detect changes in the environment and send signals to the control center to initiate a response.

Front

What is the control center in a feedback loop?

Back

The control center processes information received from receptors and determines the appropriate response to maintain homeostasis.

Front

What is an effector in a feedback loop?

Back

An effector is a component that carries out the response determined by the control center to restore balance.

Front

How does the body respond to high blood calcium levels?

Back

When blood calcium levels are high, the thyroid gland releases calcitonin, which helps lower calcium levels by promoting bone storage.