DAT EXAM SCRIPT UPDATED COMPLETE
QUESTIONS AND ANSWERS EXPERT
REVIEWED
●● Dendrites
Answer: Cytoplasmic extensions that receive information and transport
it to the cell body (soma).
●● Soma
Answer: The cell body of a neuron.
●● Axon
Answer: Long cellular extension that transmits impulses away from the
cell body.
●● Myelin
Answer: Insulating substance that sheaths axons, allowing them to
conduct impulses faster.
●● Synaptic terminal
Answer: Swellings at the end of an axon in which neurotransmitter
molecules are released.
, ●● Synapse
Answer: The gap between the the synaptic terminals of one neuron and
the dendrites or cell body of another neuron or cell.
●● Resting potential of a neuron
Answer: Cell membrane is selectively permeable to K+ but not Na+.
Higher concentration of K inside and higher concentration of Na outside.
K can diffuse down its concentration gradient and go out of the cell
while Na cant get it. This leads to the inside of the cell having a net
negative charge and the outside a net positive charge.
●● Na+/K+ pump
Answer: K+ diffuses down its gradient and gets pumped back into cell
via this protein while Na gets pumped out, maintaining the resting
potential.
●● Voltage gated ion channel
Answer: An ion channel that is opened or closed based on the electrical
potential across the plasma membrane. Once opened, the channel allows
ions to cross the membrane according to their concentration gradients.
Examples are the Na+ and K+ voltage-gated channels involved in the
action potential of neurons.
●● Action potential
QUESTIONS AND ANSWERS EXPERT
REVIEWED
●● Dendrites
Answer: Cytoplasmic extensions that receive information and transport
it to the cell body (soma).
●● Soma
Answer: The cell body of a neuron.
●● Axon
Answer: Long cellular extension that transmits impulses away from the
cell body.
●● Myelin
Answer: Insulating substance that sheaths axons, allowing them to
conduct impulses faster.
●● Synaptic terminal
Answer: Swellings at the end of an axon in which neurotransmitter
molecules are released.
, ●● Synapse
Answer: The gap between the the synaptic terminals of one neuron and
the dendrites or cell body of another neuron or cell.
●● Resting potential of a neuron
Answer: Cell membrane is selectively permeable to K+ but not Na+.
Higher concentration of K inside and higher concentration of Na outside.
K can diffuse down its concentration gradient and go out of the cell
while Na cant get it. This leads to the inside of the cell having a net
negative charge and the outside a net positive charge.
●● Na+/K+ pump
Answer: K+ diffuses down its gradient and gets pumped back into cell
via this protein while Na gets pumped out, maintaining the resting
potential.
●● Voltage gated ion channel
Answer: An ion channel that is opened or closed based on the electrical
potential across the plasma membrane. Once opened, the channel allows
ions to cross the membrane according to their concentration gradients.
Examples are the Na+ and K+ voltage-gated channels involved in the
action potential of neurons.
●● Action potential
