Bio 226 Chapter 11 questions with verified
answers
Also called a nerve impulse transmitted by axons Ans✓✓✓ Action
potential
An action potential is regarded as an example of a positive feedback.
Which of the following examples below best illustrates the positive
feedback aspect of an action potential? Ans✓✓✓ A threshold stimulus
will cause the opening of voltage gated sodium ion channels that will
cause further depolarizing stimulus. This stimulus will open still more
voltage gated sodium ion channels.
An exceptionally strong stimulus can trigger a response Ans✓✓✓
Relative refractory period
An insufficient stimulus Ans✓✓✓ Subthreshold stimulus
Any stimulus below this
intensity will result in no
response in a neuron. Ans✓✓✓ Threshold stimulus
Area where nerve impulses are generated Ans✓✓✓ trigger zone
Axon terminals release neurotransmitters. Ans✓✓✓ Secretory Zone
, Bacteria in the blood can be prevented entry to the fluids surrounding
the brain. Which cells are most responsible for preventing bacteria
from entering the fluids of the brain? Ans✓✓✓ Astrocytes
Cranial nerve II, the optic nerve sends nerve impulses to the brain
carrying information about the things we see. These nerve fibers most
likely belong to which division of the nervous system? Ans✓✓✓
sensory (afferent) division
Different types of sensory input can have the same ultimate effect.
Ans✓✓✓ Converging Circuit
During the relative refractory period of an action potential, a larger
than normal stimulus is needed to cause another action potential. This
is due to the fact that _____. Ans✓✓✓ The voltage gated potassium
ion channels remain open long enough to hyperpolarize the axon
membrane
If a post synaptic cell is stimulated to threshold by temporal summation
this implies that Ans✓✓✓ A presynaptic neuron is sending frequent
EPSP
If a post synaptic neuron is stimulated to threshold by spatial
summation this implies that ________________. Ans✓✓✓ The
postsynatpic cell has many synapses with many presynaptic neurons
answers
Also called a nerve impulse transmitted by axons Ans✓✓✓ Action
potential
An action potential is regarded as an example of a positive feedback.
Which of the following examples below best illustrates the positive
feedback aspect of an action potential? Ans✓✓✓ A threshold stimulus
will cause the opening of voltage gated sodium ion channels that will
cause further depolarizing stimulus. This stimulus will open still more
voltage gated sodium ion channels.
An exceptionally strong stimulus can trigger a response Ans✓✓✓
Relative refractory period
An insufficient stimulus Ans✓✓✓ Subthreshold stimulus
Any stimulus below this
intensity will result in no
response in a neuron. Ans✓✓✓ Threshold stimulus
Area where nerve impulses are generated Ans✓✓✓ trigger zone
Axon terminals release neurotransmitters. Ans✓✓✓ Secretory Zone
, Bacteria in the blood can be prevented entry to the fluids surrounding
the brain. Which cells are most responsible for preventing bacteria
from entering the fluids of the brain? Ans✓✓✓ Astrocytes
Cranial nerve II, the optic nerve sends nerve impulses to the brain
carrying information about the things we see. These nerve fibers most
likely belong to which division of the nervous system? Ans✓✓✓
sensory (afferent) division
Different types of sensory input can have the same ultimate effect.
Ans✓✓✓ Converging Circuit
During the relative refractory period of an action potential, a larger
than normal stimulus is needed to cause another action potential. This
is due to the fact that _____. Ans✓✓✓ The voltage gated potassium
ion channels remain open long enough to hyperpolarize the axon
membrane
If a post synaptic cell is stimulated to threshold by temporal summation
this implies that Ans✓✓✓ A presynaptic neuron is sending frequent
EPSP
If a post synaptic neuron is stimulated to threshold by spatial
summation this implies that ________________. Ans✓✓✓ The
postsynatpic cell has many synapses with many presynaptic neurons
