Homeostasis Flashcards
Homeostasis is the body’s ability to maintain _____.
a relatively stable internal condition
What is the term used for body conditions, such as temperature and blood pressure, that must remain within a narrow range and also can change?
Variable
The control centre compares input from a receptor with the ideal normal value for a condition. This ideal normal value is known as the ______.
set point
Negative feedback is a mechanism that ______.
reverses the change and maintains homeostasis
What portion of a feedback mechanism carries out a response to change a body variable?
Effector
The tendency of a living body to maintain relatively stable internal conditions in spite of greater changes in its external environment is known as ______.
homeostasis
Identify the function of the control centre within a feedback mechanism.
Receives and processes information
In a feedback mechanism a stimulus is detected by a(n) ______.
receptor
The part of the feedback mechanism that receives and processes information, relates it to other information, and makes a decision of action to be carried out by the effector is the ______.
control centre
Sweating in response to an increase in body temperature is part of a __ feedback mechanism to lower body temperature.
negative
Baroreceptors in the aorta detect an increase in blood pressure. Nerves send information to the brain. The brain compares the value of the blood pressure to a set point. Nerves send information to the heart. The heart beats slower. Blood pressure decreases. In this example the effector is the ______.
heart
A structure, molecule or cell that detects a stimulus (or change in body variable) is called a(n)
receptor or receptors
True or false: During some situations, there are beneficial deviations from body set points.
True
Reason: This statement is true. Sometimes deviations are beneficial, such as the changes in heart rate and blood pressure seen in exercise.
