Homeostasis and feedback mechanisms

Homeostasis

The existence and maintenance of a relatively constant environment within the body, regardless of external conditions.

Feedback Mechanisms

Regulatory processes that adjust one component's function based on another's conditions, crucial for maintaining homeostasis.

Negative Feedback

A mechanism that resists or diminishes any deviation from the normal setpoint, maintaining stability and homeostasis.

Positive Feedback

A rare mechanism that amplifies deviations from the normal setpoint, usually leading to an unhealthy outcome.

Thermoregulation

A negative feedback example where sweating cools the body when temperature rises.

Blood Glucose Regulation

A negative feedback example where insulin lowers high blood glucose and glucagon raises low levels.

Childbirth

A positive feedback example where oxytocin increases contractions, leading to more oxytocin release until delivery.

Blood Clotting

A positive feedback example where activated platelets recruit more platelets to an injury site.

Set Point

The level or range of levels at which a variable is to be maintained.

Normal Range

The optimal and stable range of values for a variable.

Stimulus

A change in the variable that produces a response.

Receptor

A sensor that monitors the environment and sends information to the control center.

Control Center

The component that processes sensor information and determines the response.

Afferent Pathway

The pathway that approaches the control center.

Efferent Pathway

The pathway that exits the control center to the effector.

Effector

The component that executes the response to restore balance or amplify a process.

Response

The reaction to a stimulus.