biol 72 physio exam 1 Test Questions with 100% correct answers|Verified|Rated A+
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Course
Biol 72 physio
Institution
Biol 72 Physio
Homeostasis definition - ANSWER-dynamic constancy of the internal environment that is maintained by
the body's organ systems
why does internal environment need to be kept constant? - ANSWER-so the body's cells can live
what does dynamic constancy mean? - ANSWER-a way of describing homeostasis th...
biol 72 physio exam 1 Test Questions with
100% correct answers|Verified|Rated A+
Homeostasis definition - ANSWER-dynamic constancy of the internal environment that is maintained by
the body's organ systems
why does internal environment need to be kept constant? - ANSWER-so the body's cells can live
what does dynamic constancy mean? - ANSWER-a way of describing homeostasis that includes the idea
that a variable such as blood glucose may vary in the short term but is stable and predictable when
averaged over the long term; NOT absolute constancy since adjustments have to be made as things
change to keep body parameters within narrow limits that support life
How do cells organize into tissues, organs and system support living? - ANSWER-they all maintain
homeostasis of the body and body cells
how does the human come about in terms of movement, vision, thought, or breathing? - ANSWER-by
activities of the cells
What are the examples of regulated variables? - ANSWER-body temperature, blood pH/O2/glucose, salt
and water balance
What do regulated variables do? - ANSWER-keep the body within narrow limits despite fluctuation in
intake, loss, or use
In diagnostic procedures, what does increased body temperature mean? why? - ANSWER-infection from
viruses or bacteria. they contain/trigger pyrogen, which the brain senses as a substance that cause fever
in the bloodstream
in diagnostic procedure, what does increased WBC mean? Why? - ANSWER-infection in the body. the
immune system is working to destroy the infection when one is sick by releasing WBC. WBC help fight
infection by destroying foreign virus, fungus, or bacteria.
, in diagnostic procedure, what does it mean when there is an increased in blood glucose? why? -
ANSWER-diabetes. blood glucose is high because the cells are unable to uptake glucose b/c insulin is not
working properly.
how does the body maintain homeostasis? example - ANSWER-negative feedback loops within the
body's organ system, which is able to detect small changes in the body and produce proper adjustment.
glucose and insulin work together.
negative feedback - ANSWER-a mechanism of response in which a stimulus initiates reactions that
reduce/opposite to the stimulus; feeds back to a sensor in the system that monitors the variable
how does household furnace work as a negative feedback system? - ANSWER-household furnace is a
device used to heat houses when room temperature is dropped below set point, which is detected by a
thermometer. this increase the thermostat to increase furnace, which releases heat output. once the
room reaches the set point, it feeds back to stop the thermometer and stop producing heat overall
how does a toilet tank float work as a negative feedback system? - ANSWER-the device that recognize
the level of water in the tank notices once the tank is flushed, there is low water. it needs to bring the
water back up, which the water inlet valve opens and allow water to flow in. the float then rises and
closes the inlet valve once the level of the water is back to its set point.
stimulus - ANSWER-any event or situation that evokes a response; input into the system
Receptor (sensor) - ANSWER-monitors environment and responds to stimuli such as blood glucose or pH
ex: thermoreceptors, chemoreceptors, etc..
integrator - ANSWER-receives input from many sources and controls effector tissue ex:
brain/hypothalamus
effector - ANSWER-an organ or cell that acts in response to a stimulus, normally a muscle or a gland
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