Homeostasis: Mechanisms and Regulation

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What is the primary function of homeostatic mechanisms?

To regulate the external environment
To maintain a relatively constant internal environment (correct)
To disrupt the optimal functioning of cells
To drastically change the internal environment

At what levels do negative feedback mechanisms operate?

Only at the molecular level
At various levels, including molecular, cellular, and systemic (correct)
Only at the systemic level
Only at the cellular level

What is an example of negative feedback at the molecular level?

Depolarization and repolarization in neurons
Regulation of blood pressure set point
The end product regulates its own concentration by inhibiting the enzyme responsible for its production (correct)
Regulation of plasma glucose level by insulin hormone

What is the role of insulin in negative feedback at the systemic level?

Regulation of plasma glucose level (B) Signup and view all the answers

What is the result of depolarization in neurons?

Repolarization and return to resting potential (C) Signup and view all the answers

What is the set point in negative feedback mechanisms?

The normal value of a physiological parameter (A) Signup and view all the answers

What is the main purpose of homeostasis in the body?

To regulate the internal environment for optimal cell function (B) Signup and view all the answers

What is the term for the internal environment of the cells in the body?

Interstitial fluid (D) Signup and view all the answers

What is the term for the regulation of body temperature to maintain optimal conditions for cell function?

Temperature homeostasis (B) Signup and view all the answers

What is the primary reason why homeostasis is essential for the body?

To ensure optimal functioning and survival of cells (A) Signup and view all the answers

What is the term for the relatively constant internal environment of the body?

Internal environment (D) Signup and view all the answers

What is the main consequence of homeostasis?

Optimal functioning and survival of cells (C) Signup and view all the answers

What is the primary function of the negative feedback mechanism in the regulation of thyroxine (T4) production?

To inhibit the production of T4 (A) Signup and view all the answers

What is the characteristic of the response in a negative feedback mechanism?

It is not accurate and usually overshoots the set point (D) Signup and view all the answers

What is the role of the nervous system in homeostatic mechanisms?

It provides a quick response to changes in the body (D) Signup and view all the answers

What is an example of a positive feedback mechanism?

Blood clotting process (A) Signup and view all the answers

What is the outcome of a series of stimuli and responses in a negative feedback mechanism?

Oscillations of the system occur (A) Signup and view all the answers

What is an example of a behavioural response that helps in temperature homeostasis?

Curling up and wearing warm clothes (B) Signup and view all the answers

What is the primary function of positive feedback mechanisms?

To facilitate rapid changes in physiological processes (D) Signup and view all the answers

In which of the following processes does positive feedback play a role?

Generation of an action potential (C) Signup and view all the answers

What is the role of circadian rhythms in homeostasis?

To provide a 'Feed Forward Component' to homeostasis (A) Signup and view all the answers

Homeostasis: Mechanisms and Regulation

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