BIG BANG THEORY https www youtube comwatch v9

BIG BANG THEORY https: //www. youtube. com/watch? v=9 RLnl. XNlfdk

HOMEOSTASIS

HOMEOSTASIS • Maintenance of a stable internal environment • A dynamic state of equilibrium • Homeostasis is necessary for normal body functioning • Communication within the body • 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

NEGATIVE 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

NEGATIVE 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

THERMOREGULATION

THERMOREGULATION Capillaries Sweat Glands Muscles Capillaries Body Hair

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 • 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 • https: //www. youtube. com/watch? v=he. WOEkjut. Hc

HOMEOSTASIS LAB