Homeostasis

Description

GCSE Biology Core (Topic 2, Responding to change) Mind Map on Homeostasis, created by daniifarrell on 22/12/2013.
daniifarrell
Mind Map by daniifarrell, updated more than 1 year ago
daniifarrell
Created by daniifarrell over 10 years ago
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Resource summary

Homeostasis
  1. Thermoregulation
    1. Controlled by the Hypothalamus
      1. contains receptors which are sensitive to blood tempreture in brain
        1. When change is sensed it causes a response in the Dermis
          1. When too hot:
            1. Erector muscles relax so hairs lie flat
              1. Sweat evaporates to transfer heat
                1. Vasodilation
                  1. blood vessels widen so more blood flows near the surface
                2. When too cold:
                  1. Erector muscles contract so hairs stand up to trap a layer of air
                    1. vasoconstriction
                      1. The blood vessels narrow so less blood can flow near the surface so less heat is lost
              2. Osmoregulation
                1. sending signals to the brain carrying information about water content in blood
                  1. The brain processes the information and sends signals to the kidneys regulating the water in the urine.
                    1. The signal is a hormone produced by the pituitary gland in the brain. The blood carries the hormone to the kidneys.
                      1. water content of the blood it high less hormone is released.
                        1. less hormone means more water passes through the kidneys.
                          1. Kidneys produce more urine
                        2. water content of the blood is too low, more hormone is released
                          1. more hormone means less water passes through
                            1. kidneys produce a small volume of urine
                  2. Blood Glucose
                    1. This is controlled to provide cells with a constant supply of energy. The blood sugar level is controlled by the release and storage of glucose, which is in turn controlled by a hormone called insulin
                      1. Glucose too high
                        1. insulin secreted into the blood
                          1. liver converts glucose into glycogen
                            1. Glucose level goes down
                        2. Glucose too low
                          1. insulin not secreted into the blood
                            1. liver does not convert glucose into glycogen
                        3. The normal level of glucose in the blood is about 90mg per 10cm3 of blood
                          1. The pancreas releases glucagon when sugar levels fall This causes the cells in the liver to turn glycogen back into glucose which can then be released into the blood.
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