Physiology dr aim sothea
CNS Physiology Challenge
Test your knowledge of physiology with our engaging quiz focused on the central nervous system and its fun
Key Features:
- 59 thought-provoking questions
- Multiple choice format
- Instant feedback on answers
The phagocytic cells in the CNS are:?
Astrocytes
Microglia
Oligodendrocytes
Ependymal cells
The _____cells provide a means of producing myelin?
Astrocyte
Microglia
Ependymal
Oligodendrocyte
Which of the following terms describes an accumulation of nerve cell bodies in the PNS?
Nucleus
Ganglion
Gray matter
Peripheral nerve
The resting potential of a neuron is :?
+30 mv
0 mv
-70 mv
-90 mv
The minimal stimulus needed to cause a neuron to transmit an impulse is called the:?
action potential
Resting potential
Threshold
Refractory period
Saltatory conduction occurs when an impulse jumps from:?
Axon to dendrite
Node to node
Dendrite to axon
node of Ranvier to axon
A change in a dendrite which lessens the probability of a conduction is:?
Excitatory Post-Synaptic Potentia
Inhibitatory Post-Synaptic Potential
Threshold potential
Action potential
Which of the following does NOT belong with the rest?
Summation
Facilitation
Divergence
Convergence
Which type of short neuron is found in the retina?
Bipolar
Unipolar
Multipolar
Tripolar
The following belong together EXCEPT which one?
Efferent
Multipolar
Sensory
Motor
The following belong together EXCEPT which one?
Interneuron
intercalated neuron
Association neuron
Sensory neuron
The PNS is comprised of cranial nerves and:?
Motor nerve
Sensory nerve
Somatic nerve
Spinal nerve
The cells that produce myelin in the PNS are:?
Oligodendrocyte
Axons
Schwann
Ependymal
. Diffusion of which of the following ions into the synaptic knob triggers the release of neurotransmitter?
Na+
Ca2+
Cl-
K+
Where are neurotransmitter receptors located?
Presynaptic membrane
nodes of Ranvier
Postsynaptic membrane
Synaptic vesicle membranes
A common feature of action potentials is that they
can undergo temporal and spatial summation.
Cause the membrane to hyperpolarize and then depolarize.
Are triggered by a depolarization that reaches the threshold.
Move at the same speed along all axons.
What happens when a resting neuron's membrane depolarizes
There is a net diffusion of Na+ out of the cell.
The neuron's membrane voltage becomes more positive
The neuron is less likely to generate an action potential.
The cell's inside is more negative than the outside.
Central nervous system (CNS)
The membrane closest to the brain is:?
Dura mater
Pic mater
Arachnoid meninx
Denticulate ligament
An inflammation of the brain coverings is termed:?
Encephalitis
Poliomyelitis
Meningitis
Cerebral palsy
The cerebrospinal fluid is produced by the capillaries of the:?
Lateral ventricle
Arachnoid villi
Choroid plexus
Dural sinus
What is daily amount of CSF in the nervous system at any given time?
140ml
100ml
500ml
1000ml
Which of the following is NOT a medullary vital center?
Respiratory
Vasomotor
Cardiac
Blood pressure
What is first component of reflex arch?
Motor neuron
Sensory neuron
Muscle or glance
Interneuron
What type of speech does Broca's area control?
Speech production
Speech understanding
Speech reasoning
Speech hearing
Sensory speech area in the brain is called:?
Wernicke area
Broca area
Visual area
Peripheral nervous system (PNS)
Auditory area
An area of skin innervated by sensory nerves is called:?
Dermatome
Ventral root
Dermal receptor
Dorsal root
The following are plexus names EXCEPT:?
Cervical
Thoracic
Lumbar
BrachiaL
Norepinephrine is released from:?
all autonomic nerves
The vagus nerve
Sympathetic nerves
Parasympathetic nerves
The following could occur together effectively EXCEPT:?
Sweating
Digestion
pupil dilation
Increase heart rate
A tract is collection of fibers (axon) in?
Central nervous system
Peripheral nervous system
Somatic nervous system
Autonomic nervous system
Which of the following carry sensory impulses to the CNS from receptors in muscle or skin?
general somatic efferent fibers
General somatic afferent fibers
General visceral efferent fibers
General visceral afferent fibers
Acetylcholine is decomposed by _____almost as fast as it is released.?
Monoamine oxidase
Norepinephrine
MAO inhibitors
Acetylcholinesterase
The following belong together EXCEPT which one?
Norepinephrine
Acetylcholine
Epinephrine
Adrenalin
The primary neurotransmitter from the parasympathetic system that influences its autonomic targets is?
Acetylcholine
Adenosine
Nopamine.
Ch21: Water & Electrolytes
Norepinephrine
Where is most water found in the body?
blood plasma
Whole blood
In cell
Tissue space
Which of these is relatively high in extracellular fluids?
Sodium
Potassium
Phosphate
Calcium
What is the most abundant extracellular cation?
K+
Mg++
Na+
Cl-
What is the main force that causes fluid to leave the plasma compartment?
Hydrostatic
Dialysis
Osmosis
Filtration
What is the greatest regulator of water intake?
Kidneys
Gastrointestinal system
Adequate diet
Hypothalamus
The greatest amount of body water is lost through: ?
Defecation
Urine
Breathing
Sweating
Excessive vomiting usually results in the phenomenon of :?
Dehydration
Edema
Hypoproteinemia
Water intoxication
Which ion is directly related to calcium homeostasis?
Mg++
Po43-
K+
Cl-
Which cells are most sensitive to electrolyte changes?
Osteoblasts
Leukocytes
Epithelial
Neurons
Which is the most abundant intracellular cation?
K+
Cl-
Po43-
HCo3-
What will happen when erythrocytes are placed in a hypotonic solution?
Will swell
Will shrank
Will change
Will move
What minimum amount of body water loss can the osmoreceptors in the hypothalamus detect?
1%
15%
5%
10%
Which hormone control regulation of Calcium?
Calcitonin & PTH
Calcitonin & aldolsteron
Aldosteron & PTH
Aldosteron & renin
The supporting cells that form myelin sheaths in the peripheral nervous system are ?
Satellite cells
Schwann cells
Microglia
Astrocytes
A collection of neuron cell bodies located outside the CNS is called?
A tract
A nucleus
A nerve
A ganglion
Which of these neurons are unipolar?
Sensory neurons
Neurons in the retina
Somatic motor neurons
Automatic motor neurons
Depolarization of an axon is produced by?
Inward diffusion of sodium
Active extrusion of potassium
Outward diffusion of potassium
Inward active transport of sodium
Repolarization of an axon during an action potential is produced by?
Inward diffusion of sodium
Active extrusion of potassium
Outward diffusion of potassium
Inward active transport of sodium
Which of these is not a characteristic of synaptic potentials?
They are all or none in amplitude
They decrease in amplitude with distance
They are produced in dendrites and cell bodies
They are graded in the amplitude
The summation of EPSPs from numerous presynaptic nerve fibers converging onto one postsynaptic neuron is called?
Spatial summation
Long-term potentiation
Temporal summation
Synaptic plasticity
Which of these statements about ACh receptors is false?
Skeletal muscles contain nicotinic ACh receptors
The heart contains muscarinic ACh receptors
Stimulation of ACh receptors produces tachycardia
Autonomic ganglions contains ACh receptors
Which of these may be produced by the action of muscarinic receptors in the heart?
Tachycardia
Bradycardia
Broncho-constriction
Mydriasis
A neurotransmitter, Norepinephrine is released?
Sympathethic preganglionic fibers
ParaSympathethic preganglionic fibers
Sympathethic postganglionic fibers
Autonomic preganglionic fibers
Which cranial nerves are parasympathetic?
CNI, CNIII, CNV, CNIX
CNIII, CNVII, CNIX, CNX
CNIII, CNV, CNIX, CNX
CNV, CNIX, CNX, CNXI
Main function of Parasympathetic nervous system is?
Relax. And flight
Fight and flight
Rest and digest
Digest and feed
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