#2.80
understand how organisms are able to respond to changes in their environment
#2.81
understand that homeostasis is the maintenance of a constant internal environment,and that body water content and body temperature are both examples of homeostasis
#2.82
understand that a co-ordinated response requires a stimulus, a receptor and an effector
#2.83
understand that plants respond to stimuli
#2.84
describe the geotropic and phototropic responses of roots and stems
#2.85
understand the role of auxin in the phototropic response of stems
#2.86
describe how nervous and hormonal communication control responses and understand the differences between the two systems
#2.87
understand that the central nervous system consists of the brain and spinal cord and is linked to sense organs by nerves
#2.88
understand that stimulation of receptors in the sense organs sends electrical impulses along nerves into and out of the central nervous system, resulting in rapid responses
#2.89
understand the role of neurotransmitters at synapses
#2.90
describe the structure and functioning of a simple reflex arc illustrated by the withdrawal of a finger from a hot object
#2.91
describe the structure and function of the eye as a receptor
#2.92
understand the function of the eye in focusing on near and distant objects, and in responding to changes in light intensity
#2.93
describe the role of the skin in temperature regulation, with reference to sweating, vasoconstriction and vasodilation
#2.94
understand the sources, roles and effects of the following hormones: adrenaline, insulin, testosterone, progesterone and oestrogen
#2.95B
understand the sources, roles and effects of the following hormones: ADH, FSH and LH