motor neurone (Carried impulse from CNS to effector)
effector (muscle or gland)
response (releasing hormone or moving muscle)
What is a reflex?
fast, involuntary response that does not require conscious thought
what are the 2 simple responses?
Taxes, when an organism moves it whole body towards or away from a stimulus
kinesis, the rate or speed an organism moves towards a stimuli, if an organism move from a positive to negative environment it will increase the rate it changes direction to return to a positive stimuli. If it is already in a negative stimuli it will decrease the rate at which it changed direction and remain in a straight line to reach a posiitve stimuli sooner
What is the Pacinian corpuscle and what does it do?
A pressure receptor in the skin
A sensory neurone wrapped in plasma membrane
It has stretch mediated channel proteins
When pressure is applied sodium ions enter to reach action potential
What are rod cells and what do they do?
Rods are photoreceptors in the eye that process black and white images
To reach generator potential rhodopsin pigment must be broken down by light energy
These can detect very low levels of light
Many rod cells connect to one sensory neurone (retinal convergence)
Low visual acuity so it is hard to distinguish between seperate light sources
Found further away from fovea
what are cone cells and what do they do?
cone cells are photoreceptors in the retina that are responsible for colour and high visual acuity
To reach generator potential, iodopsin pigment needs to be broken down in high light intensity
This is because only one cone cell is connected to one sensory neurone
