Buy Cells and Action Potential Discussion

Buy Cells and Action Potential Discussion
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Buy Cells and Action Potential Discussion
1. Which word correctly completes the statement: “All motor neurons are…”?
A. Interneurons
B. Multipolar
C. Bipolar
D. Unipolar
2. In the peripheral nervous system, which cells form the myelin sheath?
A. Ependymal cells
B. Schwann cells
C. Astrocytes
D. Oligodendrocytes
Buy Cells and Action Potential Discussion
3. A difference in the amount and type of ions between the two sides of a plasma
membrane or a charge difference that occurs when ions move along a membrane
is called an “electrical potential”. What does the term “action potential” refer to?
A. The distribution of ions that results in the inside of the cell being at
about –70 mV compared to outside the cell
B. A movement of sodium ions into the cell following a stimulus and the ions
spreading out along the inside of the cell membrane
C. The rapid movement of sodium ions into the cell followed by potassium ions
moving out of the cell, with the movement being repeated along the length of
the neuron
D. Sodium ions being pumped out of the cell, while potassium ions are moved
into the cell
4. What is the gap between the plasma membranes of a neuron that conducts an
incoming signal and the cell that is going to receive the signal called?
A. Neuromuscular junction
B. Intercellular cleft
C. Synaptic cleft
D. Intercalated disc
5. Which of the following substances CANNOT pass through the “blood-brain
barrier”?
A. Steroid hormones
B. O2 molecules
C. Alcohol
D. Potassium ions
6. What name is given to the cells in the nervous system that produce nerve
impulses?
A. Neurotransmitters
B. Nerves
C. Neurons
D. Neuroglia
Answer is C: Neurons produce nerve impulses. Nerves are bundles of neurones.
Neuroglia are cells that support and protect neurones.
7. Which structure carries incoming impulses towards the nerve cell body?
A. Axon hillock
B. Axon
C. Dendrite
D. Synaptic knobs
cell body. An axon transmits a nerve impulse away from the neurone cell body.
8. Which neurons are unipolar?
A. Neurons in the central nervous system
B. Neurons in the retina
C. Sensory neurons
D. Motor neurons
9. Which glial cells are responsible for forming the myelin sheath around peripheral nerve cells?
A. Astrocytes
B. Schwann cells
C. Satellite cells
D. Oligodendrocytes
14.1 Cells and Action Potential
10. Inactive muscle and nerve cells maintain a resting membrane potential. This
potential results in:
A. The outside of the cell being negative
B. The inside of the cell being positive
C. The inside and outside of the cell having the same charge
D. The inside of the cell being negative