Homeostasis, endocrine system, nervous system
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Definition of homeostasis
Regulation of the internal condition of an organism to maintain optimum conditions for enzymes to work properly
What is an effector
Muscles or glands that bring out responses
What is cordination Centre
Receives processes information and coordinates responses
What is a stimulus
Change in the environment
What is a receptor
Detects change in the environment
What is the CNS
Central nerve system
What are the two main parts of a nervous system
A series of nerves and the CNS
How is the information sent in the nervous system
As an electrical impulse
What does an electrical impulse pass through
The sensory receptor along the sensory neuron to the CNS then passes along a relay neuron in the spinal cord and straight back down along a motor neuron from that the impulse arrives in the sector organ usually a muscle and brings about a contraction we call this a reflex arc
What is a reflex arc
One in electrical impulse passes from the sensory receptor along the sensory neuron to the CNS then pass it along a relay neuron usually found in the spinal cord and straight back down along and motor neuron from there the impulse arrives at an affecter on organ usually a muscle and brings about a contraction
Why is it so important that the impulses do not go to the conscious brain
Because the brain does not process these reflexes quick enough
What is the function of a sensory neuron
Carries the electrical impulses from the receptor and passes through cells called neurons to the CNS
What is the function of a motor neuron
Carries electrical impulses from the CNS to the effector
What is the function of a relay neuron
It carries the electrical pulse from the sensory nerve cell to the motor nerve of cell
How does an electrical impulse passes through a gap between two neurons
An electrical impulse arrives hits the sacs containing chemicals chemicals go through to the receptor they attach to the receptor a new electrical impulses generated a new one is passed through
Examples of homeostasis
Controlling blood glucose Controlling body temp Controlling water levels
What is the negative feedback loop
Stimulus Sensor Control Effector
What is the body temp regulation loop
Body temp exceeds 37^c Nerve cells in skin and brain Temp regulatory centre in brain Sweet glands throughout body
What is the control system
Stimulus Receptor Coordination Efrector Response
What are the parts of a nerve cell
Dendrite Cell body Nucleus Axon
What are the three different types of neurones and there functions
Sensory neurone: carries nerve impulses from receptor to coordinator Relay neurone: carries nerve impulses in coordinator Motor neurone: carries nerve impulses from coordinator to effector
What are the parts of the synapses
Synaptic cleft Vesicles contains neurotransmitter Presynaptic membrane Postsynaptic membrane Neurotransmitter receptor molecules
What can drugs do to neurotransmitter
Can bind to them triggering impulses in different regions of the brain
What can frequent drug use lead to
Leads to overstimulating of neurones, leading to loss of function or overstimulation of different regions of the body