Co-ordination Flashcards
What is Homeostasis?
Homeostasis is the control or regulation of the internal conditions of a cell or organism
Why is Homeostasis important?
It maintains optimal conditions for enzyme action and all cell function - ensuring that reactions in the body calls can function.
What controls body temperature?
Thermoregulatory center
What processes are carried out in ever y co-ordinated response?
A stimulus
A receptor
A coordination center
An effector
What is tropism?
Directional growth responses made by plants. Towards the stimulus is positive tropism and away from the stimulus is negative tropism.
what is phototropism?
Growth towards or away from the direction of the lights source
What is Geotropism?
Growth towards or away from the source of gravity
What are Auxins in phototropism?
Plant growth regulators, to coordinate and control the directional growth responses such as phototropism and geotropism
What do Auxins do?
It stimulates cells in the region to grow and elongate
What are the two different control systems in humans?
The nervous system
The endocrine system - hormonal system
What is the nervous system?
Information sent through electrical impulses - which travel very fast along neurons. This allows rapid response to stimuli. The nervous system coordinates the activities of sensory receptors, decision-making centers in the CNS, and effector like muscles. Used when instant responses are needed.
What is the endocrine system?
Informations sent through a system of chemical substances known as hormones. These chemicals are carried by blood and circulate around the whole body. Information transmitted form one part of the body to another, effect the target organs. These hormones are used to control functions not instant responses. Produced by endocrine glands
Summarise the nervous system pathway?
Stimulus —>sensory neurons —>relay neuron —>
Motor neurons —> effector—> response
How is an impulse passes across a synapse/ synaptic cleft?
Electrical signal travels along the axon of the first neuron.
Triggers the end of the presynaptic neurons to release neurotransmitters from vesicles.
The neurotransmitters defuse across the synaptic cleft and bind to the receptor molecules.
Stimulates the second neurons to generate nad impulse
The neurotransmitters are then destroyed to prevent continued stimulation.
