Notes On Homeostasis 8/23/16
Notes On Homeostasis 8/23/16 2210
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This 2 page Class Notes was uploaded by The EIU Scientist on Friday September 9, 2016. The Class Notes belongs to 2210 at Eastern Illinois University taught by Dr. Nida Elmuti in Fall 2016. Since its upload, it has received 5 views. For similar materials see Anatomy and Physiology 1 in Biology at Eastern Illinois University.
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Date Created: 09/09/16
Notes Chapter 1 8/23/16 Homeostasis (to stay the same) Autoregulation- quick but short lived (automatic) Extrinsic- two main systems- nervous and endocrine that control it (outside infected organ) Ex of Auto: blood to muscles when in need of O2 and glucose Receptor- receives the stimulus Control Center- processes the signals and send instructions to.. Effector- carries out the instructions given by the Control Center Negative and Positive Feedback Negative = oppose, opposite- feedback loop a It opposes the stimulus, does the opposite of the stimulus Positive- amplifies the stimulus a Labor or clotting of cut b Oxytocin makes you have contractions in labor Reasons for Positive or Negative Feedback 1 Body Temperature 2 PH (blood) 3 Ions 4 Heart rate and blood pressure 5 Blood sugar 6 Oxygen and CO2 7 The amount of waste in the blood stream Some Examples of Negative feedback within the Body 1 Body Temperature High Temperature (Fever) a Sensory in body - thermoreceptor and sends it through neurotransmitters to the... b Control Center- goes to the brain (nervous system regulation )Homeostasis c Effector Organ (skin) Vasodilates, opens pores and releases heat and sweat Results in Body temperature dropping until it reaches normal and homeostasis is restored. 1 Cold Temperature (When you are cold) a Senor- thermoreceptor and sends it through neurotransmitters b Control Center- Brain c Effector Organ- Skeletal muscles Shivers by muscles with increases body heat and raises temperature until normal and then homeostasis is restored. 1 Blood PH -PH- Hydrogen and Alkaline Ions Acid (H+) ----7---- Alkaline (Base OH-) Blood PH show stay from 7.35-7.43 If the blood pH goes below 7.35 and is not corrected by the brain, respiratory system, etc. If it does get restored, you go into a comma and then die from Acidosis Exercising too much is a leading factor due to the build up of lactic acid. Cancer cells thrive in acid environments If the blood pH increases above 7.43 and is not corrected by the brain, respiratory system, etc. You die from Alkalosis because this causes over stimulation of the nervous system. Causes spasms, cardiac arrest and death. Blood Pressure Average 120/80 (magic #) Top number = systolic # Bottom number = diastolic # The blood force against a vessel's wall (artery or vein ) Hypertension- any # that is above 140/90 If you have hypertension, your body: a Detected by sensor= Baroreceptor (found in major arteries) a Sent to the BRAIN by neurotransmitters a Brain sends a message to the heart and blood vessels to 1 Vasodilate the blood vessles 1 Slow down the heart's beat Until the blood pressure returns to normal and homeostasis is restored Hypotension- Blood Pressure is too low (80/50-60) If this happens… a Sensor detects this by the Baroreceptor b Sent to the BRAIN by neurotransmitters c Brain tells the heart and blood vessels 1 Blood vessels vasoconstrict which increases the blood pressure by making the blood vessels smalller Until the blood pressure returns to normal and homeostasis is restored Blood Sugar If your blood sugar is too high… a You eat which rises blood sugar which causes hyperglycemia b This message is sent to the PANCREAS than to the BRAIN that releases the hormone Insulin a Insulin takes the excess glucose out of the blood stream and into your cells to be stored or be used in the mitochondria. b This makes the blood sugar go down and restore to homeostasis
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