Biology 0.0 / 5 ? BiologyNervous system, hormones and behaviourGCSEEdexcel Created by: c.h.a.rrrCreated on: 22-03-16 14:15 How do the pupils get smaller and why? Circular muscles contract and radial muscles relax so the retina is not damaged by bright light 1 of 13 How is body temperature controlled by vasoconstriction? Arterioles get narrower, blood flow in skin capillaries decreases and heat loss from skin is reduced 2 of 13 Where is the thermoregulatory center? Hypothalamus 3 of 13 How is body temperature controlled by vasodilation? Blood vessels supplying capillary loops dilate so more blood flows near skin surface and heat is radiated away 4 of 13 What is body temperature? 37oC 5 of 13 What is ADH and what does it do? Anti-diuretic hormone-> makes collecting duct more permeable to water so more is reabsorbed and less lost in urine 6 of 13 What is accommodation? changes that take place to allow us to see objects at different distances 7 of 13 What is the amount of light entering the eye controlled by? size of pupil changes due to muscles in the iris 8 of 13 What do effectors do? Produce a response to a detected stimulus 9 of 13 What is the reflex arc? Stimulus, receptor, sensory neurone, relay neurone, motor neurone, effector, response 10 of 13 What is another term for nerve cells? Neuone 11 of 13 What is the CNS and what does it stand for? Central Nervous System, brain and spinal cord 12 of 13 What do receptors do? Detect a stimulus 13 of 13
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