Response 2 Stimuli and Reflex Arc Flashcards
Why is Kinesis advantageous ?
Advantageous to avoid predators and competition
increase chance of finding/staying in favourable conditions
Define Stimulus
detectable change in the internal/external environment
of an organism that leads to a response
Why are responses 2 stimuli advantageous?
Due to selection pressure
Increase the chance of survival
increase chance to raise offspring and pass alleles to the next generation
Put these in order
Stimulus/effector/response/cordinator/receptor
Stimulus Receptor coordinator effector response
Define taxis
Simple directional response where the direction is determined by the direction of the stimulus
What image is a reminder to the definition of taxis?
Taxi
What are the two different types of taxis and how to they differ?
Positive Taxis= move towards stimulus
Negative taxis = move away from stimulus
Name three types of taxis
phototaxis
chemotaxis
hydrotaxis
Define Kinesis
A response where the speed of movement and the rate at which is changes directionis changed
Where are woodlice studied?
In choice chambers
Define tropism
grwoth of a plant in respose to a directional stimulus can be + or -
Why are animals left in the new condition b4 the expermient ?
To allow conditions to be established
2 allow animal 2 adapt to new condition
Which movement indicates kinesis?
random movement
Name the sequence of the reflex arc
Stimulus Receptor Sensory Neurone Co-ordinator Motor neurone Effector Response
Describe the reflex reponse (4)
Rapid
Localised
Involuntry
Short lived
Why is the Reflex Arc important (4)
Reflex Arc protects body from harm
present from birth so doesn’t have tp be learnt
Fast with few synapses
Involuntary so brain is not overloaded
Where does the Motor Nervous system send elecrtical waves?
From the central Nervous System to the effector
Where does the Sensory Nervous System send elecrtical waves?
From receptors to the central Nervous System
What makes up the Motor Nervous System?
Voluntary Nervous System
and Autonomic Nervous System
How do you determine is the lamp is the stimulus for certain?
How do you eliminate temp and gravity?
use a heat filter on the lamp to eliminate the temp
rotate the box
