Erasmus

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Question 1 of 10

1. Question
Our nervous system is organized in various subdivisions. Which two main subdivisions consist our nervous system of?
- The central and the peripheral nervous system
- The peripheral nervous system and the brain
- The brain and nerves
- The sympathetic and parasympathetic nervous system
Question 2 of 10

2. Question
In the central nervous system (CNS) we have ependymal cells. What is their function?
- They generate nerve impulses
- They are the immune apparatus of the CNS
- They produce cerebrospinal fluid
- They make myelin
Question 3 of 10

3. Question
In which part of the nerve cells are the nerve impulses / the action potential generated and transmitted?
- The dendrites
- The cell body
- The axon
- All above is correct
Question 4 of 10

4. Question
Axons are often (but not always) covered with a myelin sheet (MS). What is the function of the MS?
- MS supply energy
- MS regulate the action potential speed
- MS regulate nerve cell growth
- MS isolate the axon increase the speed of nerve impulses compared with unmyelinated axons.
Question 5 of 10

5. Question
Which two ions are most important regarding to generating and transmitting the nerve signal (action potential)?
- Sodium and potassium ions
- Magnesium and chlorines
- Magnesium and calcium ions
- Calcium and zinc ions
Question 6 of 10

6. Question
The membrane potential of cells is about -70mV (millivolts). This tells us that there is more negative charge inside the cell compared to the outside of the cell. The main factors that regulate the membrane potential is the distribution of sodium (Na+), potassium (K+) and proteins (which on average is negatively charged) inside and outside of the cell. If we open an ion channel for Na+, what happens?
- K+ flows out of the cell
- K+ flows into the cell
- Na+ flows into the cell
- Na+ flows out of the cell
Question 7 of 10

7. Question
Which description of depolarisation is correct?
- The membrane potential becomes unstable
- The membrane potential rises toward zero
- The membrane potential drops toward -100mV
- The membrane potential ceases
Question 8 of 10

8. Question
What is a synapse?
- The cell body of a nerve cell
- The attachment point for the axon to its own cell body
- The location where two neurons meets and nerve signals can be transmitted from one to the other
- The physical connections between dendrites of different nerve cells
Question 9 of 10

9. Question
What is a neurotransmitter substance?
- A molecule that is secreted from an axon and acts on neighboring neuron and thereby forwarding or inhibiting a nerve impulse to the next nerve cell.
- A molecule that is secreted from dendrites
- An enzyme that blocks the signal transmission over a synapse
- A protein increasing the speed of a nerve impulse in an axon
Question 10 of 10

10. Question
In a synapse where the presynaptic neuron secretes a neurotransmitter substance that opens Na+-channels on the postsynaptic neuron, which of the following explanation is correct?
- Na+ flows into the postsynaptic nerve and increases the likelihood that this nerve cell will generate a nerve impulse
- Na+ flows out of the postsynaptic nerve and increases the likelihood that this will generate a nerve impulse
- K+ flows into the postsynaptic nerve and increases the likelihood that this will pass on a nerve signal
- K+ flows out of the postsynaptic nerve and increases the likelihood that this will pass on nerve signal

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