18 terms



Terms in this set (...)

stimulus, sensor, control center, and effector
Both negative and positive have the same components of a
negative feedback loops
work to prevent an excessive response to the stimulus,
positive feedback loops
intensify the response until an end point is reached
the activity of cells throughout the body to maintain the physiological state within a narrow range that is compatible with life.
positive feedback loops.
Homeostasis is regulated much less frequently, by ______________.
Negative feedback
is a mechanism that reverses a deviation from the set point, and in turn, maintains body parameters within their normal range.
a________________also referred to a receptor, monitors a physiological value, which is then reported to the control center.
control center
The _____________ compares the value to the normal range.
activates an effector
If the value deviates too much from the set point, then the control center _________________.
An _______________causes a change to reverse the situation and return the value to the normal range.
Positive feedback
___________________ intensifies a change in the body's physiological condition rather than reversing it
examples of positive feedback loops
Childbirth and the body's response to blood loss are two_____________________________ that are normal but are activated only when needed.
A control center
After you eat lunch, nerve cells in your stomach respond to the distension (the stimulus) resulting from the food. They relay this information to ________.
set point
A ________ is the physiological value around which the normal range fluctuates.
A negative feedback loop
What reverses the initial stimulus in order to maintain homeostasis?
Temperature-sensitive cells in the skin and brain
• Jon's body temperature increased after working outside in hot weather.
• Temperature-sensitive cells in the skin and brain detected the decrease in body temperature and sent a message to the brain.
• The thermoregulatory center in the brain received this information, processed it, and conveyed a message to the sweat glands of the skin.
• The sweat glands caused the body to perspire (sweat).
• The evaporation of sweat caused Jon's body temperature to decrease.
Question: What is the receptor (sensor)?
Epithelial tissue, muscle tissue, connective tissue, and nervous tissue
What are the four principle tissues of the human body?
Respiratory and cardiovascular systems: the respiratory system causes inhalation of oxygen. Oxygen diffuses into the blood and is delivered to individual body cells.
Example of two different organ systems interacting with one another to maintain homeostasis