Covp Science Flashcards
At resting potential the inside of the neutron is ? Compared to the outside
Negative
What is the proper sequence of action potential events?
1) threshold voltage is reached
2) Na+ gates begin to open
3) membrane is depolarised
4) K+ gates begin to open
5) membrane repolarization begins
The action potential is measured in millivolts (mV) and is ranged from
-70mV to +30mV
A neuron undergoes depolarisation ( I.e the downward swing of a measured action potential) when
Potassium ions move out of the axon
A refractory period is
A brief time when a neuron is unable to conduct an impulse
What are action potentials
All or nothing events
The main function of the cerebellum is
Posture and balance
The brain and spinal cord are protected by membranes known as the
Meninges
Neuroglial cells support and provide nutrition for the?
Neurons
What are parts of a neuron
Dentrite,axon and cell body
Which lobe contains the primary visual cortex?
The occipital lobe
What is the general name that describes the pons, medulla and midbrain
The brain stem
What occurs sequentially when the nerve impulse is transmitted from the synapse of one neuron to postsynaptic neuron?
The synaptic vesicles release neurotransmitters into the synaptic cleft by exocytosis.
Transmission across a synapse is achieved mainly by a?
Diffusion of neurotransmitter across synaptic cleft
Acetylcholine and norepinephrine are two well known?
Neurotransmitters
Acetylcholine and norepinephrine act because of their affect on receptors at the ? Membrane?
Postsynaptic
GABA (gamma - aminobutyric acid) is normally found at
Inhibitory synapses
The neurotransmitter at neuromuscular junctions is
Acetylcholine