By Mr Gary Skinner;Mr Robin Harbord;Mr Ed Lees
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Kaposi's sa rcoma) and opportunistic infections such as TB and pneumon1a. H1�spel{:ific re�poit&ses to infection In order to fight a disease the body can react in a number of ways. The following responses are non-specific: infla mma tion lysozyme action interferon phagocytosis Damaged white cells An enzyme founc in A chemical released White blood cells engulf, digest release histamines that tears, sweat and the from cells stops protei n and destroy bacteria an d foreign cause artenoles to dilate nose destroys bacte ria synt hesis in viruses.
The slidmg filament theory of muscle contraction · as cs o ast-tw· · c· 'Btch muscle ibres specialised for slower, sustained contraction and can cope with long periods of exercise many mitochondria- ATP comes from aerobic I specialised to prod��e r �pi d, intense contractions in short bursts few mitochondria- ATP comes from respiration (electron transport chain) anaerobic respiration (glycolysis) lots of myoglobin (dark red pigment) to store little myoglobin and few capillaries The 02 and lots of ca pilla r es to supply 02.
A Conditions controlled by homeostasis fluctuate around the norm value. Negative feedback is t h e key to und erstanding homeostatic responses. Just remember- if o n e t h i n g goes up, the body responds to bring it back down, or v i c e versa. -�-<=--=-�-==--- The con dition is controlled by rise above norm norm value fall below norm response. n�gative feedback. ��-- �,, change from norm detected effectors act to return the co n d i t io n to the set point � Time - _L � � ------- � A summary of the role of negative feedback in maintaining body systems within narrow limits.