Notes prepared by: N Ngabaza
Life sciences tutor: 068 341 2728...
HOMEOSTASIS
Is the tendency of living organisms to maintain a constant composition of their
internal environment within the narrow limits.
This is where internal tissue fluids are bathed.
The tissue fluids affected by the internal environment include water regulation, pH,
oxygen and carbon dioxide content, temperature and glucose concentration
All these factors have to be kept constant, and if it's not maintained, the functioning of
the body is negatively affected, and the imbalance will have to be corrected in a
process called negative feedback mechanism.
A negative feedback mechanism is the mechanism used to oppose the imbalance
when conditions in the tissue fluid rise or fall below normal
MAINTAINING THE BLOOD GLUCOSE LEVEL
Normal level of glucose
When the Glucose level rise
above normal When glucose level drops below normal
The pancrease will secrete the The pancrease will secrete the hormone
hormone insulin which will Glucagon, which will increase the amount of
decrease the glucose level in glucose found in the blood by
the blood by converting
glucose into glycogen and Converting previously stored glycogen in
storing it in liver and muscles liver and muscles to glucose. The glucose
to be used during cellular respiration level will rise back to normal
The glucose level decreases
back to normal
Life sciences tutor: 068 341 2728...
HOMEOSTASIS
Is the tendency of living organisms to maintain a constant composition of their
internal environment within the narrow limits.
This is where internal tissue fluids are bathed.
The tissue fluids affected by the internal environment include water regulation, pH,
oxygen and carbon dioxide content, temperature and glucose concentration
All these factors have to be kept constant, and if it's not maintained, the functioning of
the body is negatively affected, and the imbalance will have to be corrected in a
process called negative feedback mechanism.
A negative feedback mechanism is the mechanism used to oppose the imbalance
when conditions in the tissue fluid rise or fall below normal
MAINTAINING THE BLOOD GLUCOSE LEVEL
Normal level of glucose
When the Glucose level rise
above normal When glucose level drops below normal
The pancrease will secrete the The pancrease will secrete the hormone
hormone insulin which will Glucagon, which will increase the amount of
decrease the glucose level in glucose found in the blood by
the blood by converting
glucose into glycogen and Converting previously stored glycogen in
storing it in liver and muscles liver and muscles to glucose. The glucose
to be used during cellular respiration level will rise back to normal
The glucose level decreases
back to normal
