Homeostasis Regulation Mechanisms

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What is the primary focus of homeostatic mechanisms?

To facilitate information transfer in physiological systems

To regulate the internal environment within a range of values compatible with life (correct)

To enhance cognitive functions

To maintain the external environment

What is a key characteristic of a regulated variable?

It is unrelated to physiological systems

It is kept within a limited range by physiological mechanisms (correct)

It is constantly changing

It is always in a state of equilibrium

What is the normal range of arterial PO2?

50-70 mmHg

75-100 mmHg (correct)

120-150 mmHg

100-120 mmHg

What is NOT an example of a homeostatic mechanism?

The ballistic system used by the nervous system for throwing a ball Signup and view all the answers

Which organ is responsible for sensing changes in Ca2+ concentration?

Parathyroid gland Signup and view all the answers

Who is credited with introducing a control systems theory approach in physiology textbooks?

Arthur Guyton Signup and view all the answers

What is the effector response to changes in blood glucose concentration in the fed state?

Change in pancreatic secretion Signup and view all the answers

What is the purpose of distinguishing between regulated and nonregulated variables?

To emphasize the stabilizing process in homeostatic mechanisms Signup and view all the answers

What is the normal range of blood osmolality?

280-296 mosM/kg Signup and view all the answers

What is an additional function of homeostatic mechanisms, as suggested by recent research?

To facilitate information transfer in physiological systems Signup and view all the answers

Which sensor is responsible for detecting changes in core body temperature?

Thermosensors Signup and view all the answers

What is the effect of changes in mean arterial pressure on the heart?

Change in heart rate Signup and view all the answers

What is the primary function of feedforward control mechanisms in maintaining homeostasis?

To predict and initiate responses to changes in the physiology of the organism Signup and view all the answers

Why is the definition of homeostasis being broadened to include anticipatory mechanisms?

To include a range of mechanisms that can help maintain homeostasis Signup and view all the answers

What is the primary purpose of the model of a homeostatic regulatory system illustrated in Fig. 1?

To help faculty members teach and students learn the core concept of homeostasis Signup and view all the answers

What is the result of anticipatory increases in breathing frequency during exercise?

Reduced time course of the response to exercise-induced hypoxia Signup and view all the answers

What is the primary mechanism illustrated in the model of a homeostatic regulatory system in Fig. 1?

Negative feedback mechanism Signup and view all the answers

What is the purpose of negative feedback mechanisms in maintaining homeostasis?

To minimize the error signal Signup and view all the answers

Homeostasis Regulation Mechanisms

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