Describe how the nervous system is involved in the maintenance of a constant body temperature.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.

1. [6] (a) hypothalamus ; reference to detecting blood temperature; receptors; in skin; detect temperature + of surroundings AW ; impulse; sensory neurone ; to central nervous system / brain / spinal cord ; motor neurone ; effector; named effector ; shiver/vasoconstriction or vasodilation / sweat increase or decrease; reference to negative feedback;
2. [4] (b) correct named situation; target organ / named ; (any two effects from) glycogen to glucose / sugar; increased (heart) rate; pupils dilate; dry mouth; breathing rate change; diversion of blood to muscle / from gut;