Embed Size (px)
Citation preview
Big Bang Theory
https://www.youtube.com/watch?v=9RLnlXNlfdk
Homeostasis
Homeostasis
Homeostasis
Homeostasis—maintenance of a stable internal environment A dynamic state of equilibrium
Homeostasis is necessary for normal body functioning and to sustain life
Communication within the body is essential Nervous and endocrine system (nerves and hormones)
Feedback Loop Terms
Receptor: a sensory organ
Stimulus: an action that evokes a response
Effector: an organ that acts in response
Response: the caused action of the effector
Control Center: determines the level at which a variable is to maintained, analyzes info, determines response
Figure 1.4, step 1a
Variable(in homeostasis)
Figure 1.4, step 1b
Stimulus:Produceschangein variable
Variable(in homeostasis)
Imbalance
Imbalance
Figure 1.4, step 2
Changedetectedby receptor
Stimulus:Produceschangein variable
Receptor (sensor)
Variable(in homeostasis)
Imbalance
Imbalance
Figure 1.4, step 3
Changedetectedby receptor
Stimulus:Produceschangein variable
Input:Informationsent alongafferentpathway to
Receptor (sensor)
Variable(in homeostasis)
Controlcenter
Imbalance
Imbalance
Figure 1.4, step 4
Changedetectedby receptor
Stimulus:Produceschangein variable
Input:Informationsent alongafferentpathway to
Receptor (sensor) Effector
Variable(in homeostasis)
Output:Information sentalong efferentpathway to activate
Controlcenter
Imbalance
Imbalance
Figure 1.4, step 5
Changedetectedby receptor
Stimulus:Produceschangein variable
Input:Informationsent alongafferentpathway to
Receptor (sensor) Effector
Variable(in homeostasis)
Response ofeffector feedsback toinfluencemagnitude ofstimulus andreturns variableto homeostasis
Output:Information sentalong efferentpathway to activate
Controlcenter
Imbalance
Imbalance
Feedback Loop Receptor: a sensory organ
Stimulus: an action that evokes a response
Effector: an organ that acts in response
Response: the caused action of the effector
Feedback Loop Practice (speed sign)
Receptor: a sensory organ
Stimulus: an action that evokes a response
Effector: an organ that acts in response
Response: the caused action of the effector
Feedback Loop Practice (thermostat)
Receptor: a sensory organ
Stimulus: an action that evokes a response
Effector: an organ that acts in response
Response: the caused action of the effector
Feedback Loop Practice (thermostat)
Receptor: a sensory organ
Stimulus: an action that evokes a response
Effector: an organ that acts in response
Response: the caused action of the effector
Thermoregulation
Thermoregulation
CapillariesSweat Glands
MusclesCapillariesBody Hair
Cells….Tissues….Organs (Shivering)
Muscles Cells: ions move in and out to trigger contraction
Cells….Tissues….Organs (Shivering)
Muscles Cells: ions move in and out to trigger contraction
Individual muscle cells contract
Active transport of ions on a cellular level
Cells….Tissues….Organs (Shivering)
Muscles Tissue: Chemicals move from one cell to another to contract many cells
Cells….Tissues….Organs (Shivering)
Muscles Tissue: Chemicals move from one cell to another to contract many cells
Acetylcholine (Ach)
Binds to receptors on cells
Cells….Tissues….Organs (Shivering)
Whole Muscle (Ex. Bicep): Once at the level of tissue contraction it is a chain reaction and the whole muscle will contract and relax repeatedly. OVER AND OVER AGAIN
Blood Glucose
Read the article titled Insulin and Glucagon
Work in a groups of 2-3 to construct a negative feedback loop like we practiced
Identify receptor, effectors, stimuli, and responses
Draw and label a negative feedback loop
Blood Glucose
Body CellsLiver
Liver
Blood Glucose
Body CellsLiver
Liver
Insulin(Beta Cells)
Blood Glucose
Body CellsLiver
Liver
Insulin(Beta Cells)
Glucagon(Alpha Cells)
Positive Feedback Mechanisms
Positive feedback Increases the original stimulus to push the variable farther In the body this only occurs in blood clotting and during
the birth of a baby Or when a person goes into shock which
https://www.youtube.com/watch?v=heWOEkjutHc
HOMEOSTASIS LAB
