[14.1] survival and response Flashcards
1
Q
describe the sequence of events in stimulus and response
A
- stimulus
- receptor
- coordinator
- effector
- response
2
Q
what is a stimulus?
A
a detectable change in the internal or external environment of an organism that leads to a response
3
Q
what is a receptor?
A
- detects stimuli
- specific to one type of stimulus
- eg. photoreceptor, thermoreceptor, chemoreceptor etc.
4
Q
what is a coordinator?
A
- mediator between receptor and effector
- determines what the response will be and tells the effector
- eg. CNS
5
Q
what is an effector?
A
- brings about the response
- eg. secretion of hormones from gland, movement of muscle
6
Q
what is a response?
A
- result of the change
- eg. trees losing leaves
7
Q
where do sensory, relay, and motor neurons fit into the sequence of events?
A
- sensory: between receptor and coordinator
- relay: coordinator
- motor: between coordinator and effector
8
Q
what is sensitivity?
A
the capacity to detect internal or external stimuli and to then respond appropriately
9
Q
what does an endocrine gland do?
A
produces material and secretes it via the bloodstream
10
Q
what does an exocrine gland do?
A
- produces material and secretes it via a duct
- eg. pancreatic duct secretes amylase
11
Q
what is taxis?
A
- directional movement based response to a specific stimulus
- positive = towards, negative = away
12
Q
what is kinesis?
A
- random movement based response to a specific stimulus
- changes speed and rate at which it changes direction
13
Q
what is the aim of tactic and kinetic responses?
A
for the organism to get itself into a favourable environment
