BIOD 102 Exam 3 | Questions and Answers Latest
Updated (Graded A+)- Portage Learning
1. What are the three main types of
neurons? Sensory neurons,
interneurons, motor neurons
2. What is the function of the sensory neuron?
Sensory neurons receive information from an
organisms external and internal environment and
transmit the information to the brain
3. What is the function of interneurons?
Interneurons are connecting neurons that are
usually part of a circuit. Interneurons have the role
of integrating information to that a response can
occur.
4. What is the function of motor neurons?
Motor neurons are outgoing messengers.
Specifically, these neurons transmit messages from
the brain to muscle fibers or glands to elicit a desired
response
5. At what part of the neuron does the cell body
meet the axon? Axon hillock
6. What part of the neuron are responsible for
receiving signals from other neurons?
Cell body and dendrites
7. What part of the neuron are branched extensions
extending outward? Dendrites
8. What part of the neuron serves at the highway for
the transport of action potentials?
Axon
9. What part of the neuron contains the
cellular organelles? Cell body
, 10. What part of the neuron forms a junction with
the next neuron or target tissue and contains
neurotransmitters that will be released at the
synapse?
Synaptic terminals
11. Positive ions leaving the cell or negative ions
flowing into the cell through voltage-gated ion
channels
Hyperpolarization
12. Positive ions flow into the cell or negative ions
flow out -> the cell becomes more negative
Depolarization
13. What is the order of the phases of an action
potential
1) Resting phase
2) Depolarization
3) Rising phase
4) Falling phase
5) Undershoot
14. Describe the resting phase of an action
potential
During the resting phase, the gated Na+ and K+
channels are both closed, and the membrane
potential is around -70 mv
15. Describe the depolarization phase of an action
potential
A stimulus arrives at the dendrites and causes na+
channels to open, which allows na+ ions to flow into
the cell down their gradient (from high to low
concentration). Notice k+ channels remain closed. A
depolarization occurs causing the membrane
potential to reach the threshold
16. Describe the rising phase of an action potential
Positive feedback causes the opening of more na+
Updated (Graded A+)- Portage Learning
1. What are the three main types of
neurons? Sensory neurons,
interneurons, motor neurons
2. What is the function of the sensory neuron?
Sensory neurons receive information from an
organisms external and internal environment and
transmit the information to the brain
3. What is the function of interneurons?
Interneurons are connecting neurons that are
usually part of a circuit. Interneurons have the role
of integrating information to that a response can
occur.
4. What is the function of motor neurons?
Motor neurons are outgoing messengers.
Specifically, these neurons transmit messages from
the brain to muscle fibers or glands to elicit a desired
response
5. At what part of the neuron does the cell body
meet the axon? Axon hillock
6. What part of the neuron are responsible for
receiving signals from other neurons?
Cell body and dendrites
7. What part of the neuron are branched extensions
extending outward? Dendrites
8. What part of the neuron serves at the highway for
the transport of action potentials?
Axon
9. What part of the neuron contains the
cellular organelles? Cell body
, 10. What part of the neuron forms a junction with
the next neuron or target tissue and contains
neurotransmitters that will be released at the
synapse?
Synaptic terminals
11. Positive ions leaving the cell or negative ions
flowing into the cell through voltage-gated ion
channels
Hyperpolarization
12. Positive ions flow into the cell or negative ions
flow out -> the cell becomes more negative
Depolarization
13. What is the order of the phases of an action
potential
1) Resting phase
2) Depolarization
3) Rising phase
4) Falling phase
5) Undershoot
14. Describe the resting phase of an action
potential
During the resting phase, the gated Na+ and K+
channels are both closed, and the membrane
potential is around -70 mv
15. Describe the depolarization phase of an action
potential
A stimulus arrives at the dendrites and causes na+
channels to open, which allows na+ ions to flow into
the cell down their gradient (from high to low
concentration). Notice k+ channels remain closed. A
depolarization occurs causing the membrane
potential to reach the threshold
16. Describe the rising phase of an action potential
Positive feedback causes the opening of more na+
