BIOL 1334 University Of Houston - Downtown -A&P 1334
Exam 3 Questions | 2026/2027 | Answers Correct | With
Complete Solutions
2 Principal Cells Correct Answers Neurons
Supporting cells (Neuroglia or Glial Cells)
2 Principal Parts (Nervous System) Correct Answers Central
Nervous System
Peripheral Nervous System
3 Overlapping function Correct Answers Gather sensory input
- sensory receptors changes inside and outside body
Integration sensory input
- Processes & interprets to respond to changes
Initiates motor output
Absolute Refractory Period Correct Answers *Complete
unresponsiveness*
- Na+ channels are in activated state (they can't be opened more
until the resting potential is restored and gates return to the
initial closed but ready state)
- This ensures that an AP can not begin until the preceding one
ends
Acetycholine Correct Answers Excitatory or inhibitory
Found in both CNS & PNS
,Placed in its own special category because it is dissimilar to any
other NT
Action Potential Correct Answers Generated at initial segment
and propagated along the conductive segment to the
transmissive segment
Brief, rapid, large changes in membrane potentials (100mV in
neurons) during which the potential actually reverses (inside of
the cell becomes more positive than the outside)
Action potential propagation Correct Answers Once an action
potential is triggered the impulse is propagated along the length
of the axon without further stimulation
Two methods of propagation:
- Contiguous
- Saltatory
All or None Law Correct Answers Action potential obeys this
law
Either an excitable membrane responds to a triggering event
with a maximal action potential or it doesn't at all
Amino Acids Correct Answers Protein building blocks
Depending on type, can be excitatory or inhibitory
Examples:
,- Glutamate
- GABA (modified amino acid)
- Aspartate
- Glycine
Anaxonic (Neuron Structure Classification) Correct Answers
Have only dendrites and no axon
Produce only local electrical signals
Produces no action potentials
Anionic Cellular Protein (A-) Correct Answers Membrane
impermeable to A-
Serves to attract cations into cells
Establishes a negative charge inside cell as K+ leaves down its
conc. gradient
Arachnoid Mater (Meninges) Correct Answers Richly
vascularized
Overlies the subarachnoid space (filled with CSF)
Arachnoid villi
- Penetrate through the dura to project into the dural sinuses
- CSF is reabsorbed into the blood
Arachnoid trabeculae
- Web of collagen and elastic fibers
, - Extend through the subarachnoid space to the pia mater
- Support cerebral arteries and veins
Association Areas Correct Answers Process and interpret
incoming data or coordinate a motor response
Types:
- Premotor Cortex (aka motor association area)
- Somatorsensory association area
- Visual association area
- Auditory association area
Astrocyte (CNS) Correct Answers Most abundant
Control chemical environment
Play a role in exchanges between capillaries and neurons
Physically support neurons in their proper spatial relationships
("glue")
Scaffold direct neurons to proper destination
Acts as scar tissue after damage
Astrocytes (BBB) Correct Answers In BBB
Signal to the capillaries to form their tight junctions
Participate in cross-cellular transport of some substances
Exam 3 Questions | 2026/2027 | Answers Correct | With
Complete Solutions
2 Principal Cells Correct Answers Neurons
Supporting cells (Neuroglia or Glial Cells)
2 Principal Parts (Nervous System) Correct Answers Central
Nervous System
Peripheral Nervous System
3 Overlapping function Correct Answers Gather sensory input
- sensory receptors changes inside and outside body
Integration sensory input
- Processes & interprets to respond to changes
Initiates motor output
Absolute Refractory Period Correct Answers *Complete
unresponsiveness*
- Na+ channels are in activated state (they can't be opened more
until the resting potential is restored and gates return to the
initial closed but ready state)
- This ensures that an AP can not begin until the preceding one
ends
Acetycholine Correct Answers Excitatory or inhibitory
Found in both CNS & PNS
,Placed in its own special category because it is dissimilar to any
other NT
Action Potential Correct Answers Generated at initial segment
and propagated along the conductive segment to the
transmissive segment
Brief, rapid, large changes in membrane potentials (100mV in
neurons) during which the potential actually reverses (inside of
the cell becomes more positive than the outside)
Action potential propagation Correct Answers Once an action
potential is triggered the impulse is propagated along the length
of the axon without further stimulation
Two methods of propagation:
- Contiguous
- Saltatory
All or None Law Correct Answers Action potential obeys this
law
Either an excitable membrane responds to a triggering event
with a maximal action potential or it doesn't at all
Amino Acids Correct Answers Protein building blocks
Depending on type, can be excitatory or inhibitory
Examples:
,- Glutamate
- GABA (modified amino acid)
- Aspartate
- Glycine
Anaxonic (Neuron Structure Classification) Correct Answers
Have only dendrites and no axon
Produce only local electrical signals
Produces no action potentials
Anionic Cellular Protein (A-) Correct Answers Membrane
impermeable to A-
Serves to attract cations into cells
Establishes a negative charge inside cell as K+ leaves down its
conc. gradient
Arachnoid Mater (Meninges) Correct Answers Richly
vascularized
Overlies the subarachnoid space (filled with CSF)
Arachnoid villi
- Penetrate through the dura to project into the dural sinuses
- CSF is reabsorbed into the blood
Arachnoid trabeculae
- Web of collagen and elastic fibers
, - Extend through the subarachnoid space to the pia mater
- Support cerebral arteries and veins
Association Areas Correct Answers Process and interpret
incoming data or coordinate a motor response
Types:
- Premotor Cortex (aka motor association area)
- Somatorsensory association area
- Visual association area
- Auditory association area
Astrocyte (CNS) Correct Answers Most abundant
Control chemical environment
Play a role in exchanges between capillaries and neurons
Physically support neurons in their proper spatial relationships
("glue")
Scaffold direct neurons to proper destination
Acts as scar tissue after damage
Astrocytes (BBB) Correct Answers In BBB
Signal to the capillaries to form their tight junctions
Participate in cross-cellular transport of some substances
