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Response to change (Heart rate (Myogenic = Can initiate its own…
Response to change
Heart rate
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Supplied with nerves from the medulla oblongata (Nerves can affect the frequency of the contractions)
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Layer of insulation exists between the atria and ventricles to prevent the first wave of impulse from the SAN from travelling all the way down
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Taxes
Simple response whose direction is determined by the direction of the stimulus - moving its whole body either towards a favourable stimulus or away from the stimulus
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Some species of bacteria will move towards a region where glucose is more highly concentrated (positive chemotaxis)
Kinesis
Form of response in which the organism doesn’t move towards or away from a stimulus - it changes the speed at which it moves and the rate at which it changes direction
Eg woodlice lose water from their bodies in dry conditions, when they move from a damp area to a dry one, they move more rapidly and change direction often, increasing the chance of going back to a damp area
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Receptors
Pacinian corpuscle
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Deformation of stretch-mediated sodium ion channels leads to the establishment of a generator potential
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Human's retinas
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Fourth layer have axons of ganglion cells, which form the optic nerve, which sends signals to the brain
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Blood Pressure
If blood pressure rises too high, signals are sent to the cardiovascular centre
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Blood Glucose
Blood travels through the pancreas, detected by alpha cells
Beta cells release insulin, binds with glycoproteins
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