Font size
WorksheetsFIVIZZ: WEEK 5 - BIOLOGY 3
Total questions: 10
Worksheet time: 9mins
All action potentials are of the same amplitude i.e. after threshold is reached, the size of the action potential produced remain constant & is independent of the intensity of stimulus.
(a)
An information that passes along the axon & changes the potential difference across the membrane & generates action potential.
(a)
Which is/are true about Resting Potential?
Also called as Polarization
Inner membrane is positively charged while outer membrane is negatively charged
The potential difference which exists across the axon membrane when neurone is conducting an impulse or is not at rest
Caused by unequal distribution of charged ion inside & outside the neurone membrane
What are the similarities between Pyramid cell, purkinje cells & motor neurone?
Multi-polar
Unipolar
Bipolar
None of the above
There are 3 types of ions that play significant roles to determine resting potentials: Sodium, Potassium and organic molecules. Different concentration of these ions are maintained by an interplay of several factors. What are they?
internal cations
active transport across the axon membrane
voltage-gated Na+/K+ are both open
diffusion
Which is/are NOT true about excitatory psychoactive drugs?
They interfere with normal enzyme breakdown of a neurotransmitter
They prevent the release of a neurotransmitter
To amplify synaptic transmission
One of the drugs is Organophosphate insecticides
What are the similarities between amphetamines, barbiturates, alcohol, narcotic analgesics and antidepressants?
(a)
Which is/are true about inhibitory drugs?
To decrease synaptic transmission
They prevent the release of a neurotransmitter
Curare is an artificial poison that blocks the action of acetylcholine at neuromuscular junctions
They block the action of a neurotransmitter at the receptors on presynaptic membrane
Which of the following is/are NOT the functions of synapse?
Transmit information between neurones
Filter out low-level stimuli of limited importance
Transmit nerve impulses in any directions
Protect the receptors from damage by overstimulation
Which of the followings is/are the main neurotransmitter(s) used in vertebrate nervous system?
Acetylcholine
Dopamine
Nonadrenalin
Norepinephrine
