Transcript Homeostasis - Daphne

Additional Concepts:
• The internal environment of the
organism
Additional Concepts:
• The internal environment of the
organism: mostly composed of
the extracellular fluid
Additional Concepts:
• The internal environment of the
organism: mostly composed of
the extracellular fluid
• The ECF includes
Additional Concepts:
• The internal environment of the
organism: mostly composed of
the extracellular fluid
• The ECF includes
– plasma
Additional Concepts:
• The internal environment of the
organism: mostly composed of
the extracellular fluid
• The ECF includes
– plasma
– interstitial fluid
How does the organism stay
alive?
How does the organism stay
alive?
• Organ systems work together
How does the organism stay
alive?
• Organ systems work together to
maintain a relatively constant
internal environment
How does the organism stay
alive?
• Organ systems work together to
maintain a relatively constant
internal environment to which the
cells are exposed
How does the organism stay
alive?
• Organ systems work together to
maintain a relatively constant
internal environment to which the
cells are exposed
• In other words: the organ systems
carry out
How does the organism stay
alive?
• Organ systems work together to
maintain a relatively constant
internal environment to which the
cells are exposed
• In other words: the organ systems
carry out
homeostasis
Homeostasis:
Homeostasis:
the maintenance of a
relatively constant
internal
environment
Examples of homeostasis
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
body temperature over time
37.5 °
body temperature over time
37.5 °
36.5 °
body temperature over time
37.5 °
36.5 °
body temperature over time
37.5 °
36.5 °
37.0 °
body temperature over time
37.5 °
36.5 °
37.0 °
(set point)
Components of a homeostatic
mechanism
Components of a homeostatic
mechanism
Stimulus
Components of a homeostatic
mechanism
Stimulus
Components of a homeostatic
mechanism
Stimulus
Receptors
Components of a homeostatic
mechanism
Stimulus
Receptors
Components of a homeostatic
mechanism
Stimulus
Receptors
Control
Center
Components of a homeostatic
mechanism
Stimulus
Receptors
Control
Center
Components of a homeostatic
mechanism
Stimulus
Receptors
Control
Center
Effectors
Components of a homeostatic
mechanism
Stimulus
Receptors
Control
Center
Effectors
Components of a homeostatic
mechanism
Stimulus
Receptors
Control
Center
Response
Effectors
Regulation of Body Temp.
Stimulus
Receptors
Control
Center
Response
Effectors
Regulation of Body Temp.
Stimulus
Temp
Receptors
Control
Center
Response
Effectors
Regulation of Body Temp.
Stimulus
Temp
(Various
Receptors
Neurons)
Control
Center
Response
Effectors
Regulation of Body Temp.
Stimulus
Temp
(Various
Receptors
Neurons)
(HypoControl
thalamus)
Center
Response
Effectors
Regulation of Body Temp.
Stimulus
Temp
(Various
Receptors
Neurons)
(HypoControl
thalamus)
Center
Response
(Sweat
Effectors glands,
etc.)
Regulation of Body Temp.
Stimulus
Temp
(Various
Receptors
Neurons)
(HypoControl
thalamus)
Center
Response
Temp
(Sweat
Effectors glands,
etc.)
Regulation of Body Temp.
Stimulus
Temp
(Various
Receptors
Neurons)
(HypoControl
thalamus)
Center
Response
Temp
(Sweat
Effectors glands,
etc.)
blood pH over time
7.4
blood glucose over time
100 dl/ml
Tissues