Anita Akweshie-
internal conditions of an organism must be kept
constant
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what is homeostasis
the regulation of the internal conditions of a cell or organism to maintain optimum conditions for function, in response to internal and external changes
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why is homeostasis critically important for organisms
ensures maintenance of optimal conditions for enzyme action and cell function
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which cells detect information about the conditions inside and outside the body
sensory cells
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examples of physiological factors controlled by homeostasis in mammals
core body temperature
metabolic waste
blood pH
concentration of glucose in the blood
water potential of the blood
concentration of respiratory gases in the blood
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what do majority of homeostatic control mechanisms in organisms use to maintain homeostatic balance
negative feedback
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what is homeostatic balance
to keep certain physiological factors within certain limits
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what do negative feedback loops involve
a receptor (sensor)
a coordination system (nervous system and endocrine system)
an effector (muscles and glands)
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in a negative feedback control loop what is a receptor used for
to detect a stimulus that is involved with a condition/physiological factor
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in a negative feedback loop, what is a coordination system used for
to transfer information between different parts of the body
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in a negative feedback loop, what is an effector used for
to carry out a response
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what are the outcomes of a negative feedback loop
the factor/stimulus is continuously monitored
if factor increased ,the body responds to make it decrease
if factor decreased, the body responds to make it increase
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homeostasis in mammals relies the two different coordination systems to transfer information
nervous system & endocrine system
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for homeostasis in mammals, in the nervous system
information is transmitted as electrical impulses that travel along neurones
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for homeostasis in mammals, in the endocrine system
information is transmitted as chemical messengers called hormones that travel in blood
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what kind of responses is the nervous system usually required for in homeostasis
fast but short-lived
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what kind of responses is the endocrine system usually required for in homeostasis
slower but long-lasting although
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true/false
the endocrine system is always used for slower but long-lasting responses
false
