Homeostasis Flashcards

Flashcards about Homeostasis

Homeostasis

The condition in which the body’s internal environment remains relatively constant within physiological limits.

Nervous System

Detects imbalances and sends messages in the form of nerve impulses to organs that can correct the imbalance.

Endocrine System

Corrects imbalances by secreting molecules, called hormones, into the bloodstream.

Receptors

Detect changes in a controlled condition and send information to the control centre.

Control Centre

Sets the range for a particular ‘controlled condition’, evaluates input received from receptors, and generates output commands.

Effectors

Receive output from the Control Centre and produce a response that changes the controlled condition.

Negative Feedback

Occurs when a response to a stimulus reverses or eliminates the change in a controlled condition.

Regulation of Blood Pressure

Stimuli increase BP and pressure sensitive receptors detect higher BP and homeostasis is restored.

Regulation of Blood Glucose

Fluctuations occur constantly throughout the body, stimulates glucose uptake and stimulates glycogen formation.

Positive Feedback

Occurs when the response to a change in a controlled condition strengthens or enhances the change.