Big Bang Theory https www youtube comwatch v9
Big Bang Theory https: //www. youtube. com/watch? v=9 RLnl. XNlfdk
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
Variable (in homeostasis) Figure 1. 4, step 1 a
Stimulus: Produces change in variable Imb ala nce Variable (in homeostasis) Imb ala nce Figure 1. 4, step 1 b
Receptor (sensor) Change detected by receptor Stimulus: Produces change in variable Imb ala nce Variable (in homeostasis) Imb ala nce Figure 1. 4, step 2
Input: Information sent along afferent pathway to Control center Receptor (sensor) Change detected by receptor Stimulus: Produces change in variable Imb ala nce Variable (in homeostasis) Imb ala nce Figure 1. 4, step 3
Input: Information sent along afferent pathway to Control center Output: Information sent along efferent pathway to activate Effector Receptor (sensor) Change detected by receptor Stimulus: Produces change in variable Imb ala nce Variable (in homeostasis) Imb ala nce Figure 1. 4, step 4
Input: Information sent along afferent pathway to Control center Output: Information sent along efferent pathway to activate Effector Receptor (sensor) Change detected by receptor Stimulus: Produces change in variable Imb ala nce Variable (in homeostasis) Imb ala nce Response of effector feeds back to influence magnitude of stimulus and returns variable to homeostasis Figure 1. 4, step 5
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 Capillaries Sweat Glands Muscles Capillaries Body 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 Cells Liver
Blood Glucose Body Cells Liver Insulin (Beta Cells) Liver
Blood Glucose Body Cells Liver Insulin (Beta Cells) Glucagon (Alpha Cells) Liver
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=he. WOEkjut. Hc
HOMEOSTASIS LAB
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