Download Chapter 48 Worksheet

Vocabulary Box.
-Glia Cells
-Oligodendrocytes
Distinguish between the central and peripheral nervous systems. -Schwann
-Resting Potential
-Ligand-Gated Channel
-Voltage-Gated Channel
Distinguish between the sensory and motor neurons.
-Stretch-Gated Channel
-neurotransmitters
Chapter 48 Worksheet
Label the following parts of a neuron.
Signal Transduction.
1. Resting Potential:
2. Stimulus:
3. Depolarization: influx of Na+ in.
4. Repolarization
Outline the main steps taking
place in this picture:
What part of the nerve are we looking at?
What is an example of a neurotransmitter?
1. The part of a neuron that carries nerve impulses toward the cell body is called _____.
a. a nerve
b. white matter
c. a neurotransmitter
d. a dendrite
e. an axon
2. Which one of the following statements is not true about the resting potential?
a. The neuron's plasma membrane is much more permeable to potassium than to
sodium.
b. The concentration of sodium is much higher inside the cell than outside.
c. The sodium-potassium pump plays a role in maintaining the resting potential.
d. Inside the cell, the concentration of potassium is much higher than the concentration
of sodium.
e. All of these are true statements.
3. Which one of the following statements about the transmission across a typical
chemical synapse is not true?
a. Neurotransmitter molecules are stored in vesicles in the synaptic terminal.
b. Action potentials trigger chemical changes that make the neurotransmitter vesicles
fuse with the plasma membrane of the transmitting cell.
c. Vesicles containing neurotransmitter molecules diffuse to the receiving cell's plasma
membrane.
d. Neurotransmitter molecules bind to receptors in the receiving cell's plasma
membrane.
e. The binding of neurotransmitter molecules to receptors transmits an impulse across a
synapse.
4. A drug that causes potassium to leak out of a neuron, increasing the positive charge
on the outside, would _____.
a. make it easier to trigger action potentials in the neuron
b. cause the cell to release its neurotransmitter
c. speed up nerve signals traveling the length of the cell
d. act as a stimulant
e. inhibit transmission of nerve signals by the neuron
4. A physician friend of yours tells you about a patient with a head injury who suddenly
stopped breathing during the examination. What portion of the brain was probably
injured?
a. medulla oblongata
b. cerebrum
c. cerebellum
d. hypothalamus
e. pituitary