Physiology Flashcards by خالد مجرشي

stimulation pacinian above the threshold level well produce WOTF physiological effect ?

Action potential

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abdulrhaman had an accident. after recovery he had a mask face WOTF affected ?

Cortic obulbar

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years old women can’t dress her cloth WOTF basal ganglia’s function is effected ?

Cognitive function

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WOTF is character of spinal reflex?

Inhibit or induced Means by brain

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PATIENT case… loss of speech which area most likely to be affected?

Area44

مختلف عليه

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which sensation in dorsal column?

Vibration

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WOTF is receptor stop abruptly the transition of action potential after reaching adequate
stimulus?

A- Golgi tendon or B- messiener C- warmth

مختلف عليه

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increase in which ion cause presynaptic lead to release

neurotransmitters ?

Ca+

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WOTF is type of synaptic plasticity responsiblefor factual memory?

Long term potential

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WOTF is state of ion channels during excitatory zero?

A- Na close , k open

B- Na close . K close

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accumulation of glycinein the synaptic cleft well produce the following effect ?

Postsynaptic inhibition

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WOTF is the function of lateral zone of cerebellum ?

Planning

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receptor can detect stimulus intensity by WOTF.?

Connection between recept

or and cerebral cortex

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receptor potential once generated , which characters is correct?

variable period

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which of the following responsible for planning and programming in cerebellum ?

lateral zone

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What does the Functional output from basal ganglia to reticular formation ?

Decrease muscle tone

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WOTF is a rapid adapting receptor?

meissner

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when the impulse reach the presynaptic neuron , which of the following will occur ?

binding of vesicles to the cell membrane and release NT

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detection of stimulus modality depend on ?

connection between receptor and specific sensory area in cortex

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WOTF is a character of reflex ?

Not sure of the answer

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the part which responsible for turning on/off the pattern is ?

basal ganglia

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WOTF is a facilitator for muscle tone ?

caudate N

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a patient has been administered to neurosurgery department in King Fahad Hospital,

there is a fracture in the cervical vertebrae and a damage on both side of the lateral side

of spinal cord , which function from the following may be affected?

writing and drowing movement (fine movement)

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WOTF is correct about Alpha-motor neuron ?

generate a great force of contraction

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Dorsal column tract transmit which of the following sensation?

vibration

enkephalin inhibit pain transmission through which mechanism?

prevent calcium influx in the pain afferent fiber

While the eyes are closed WOTF receptor for fine touch sensation

Meissner’s corpuscles and merkel disc

WOTF from lateral spinothalmic sensation ?

Pain & Temperature

WOTF from ventral spinothalmic sensation?

Crude touch

WOTF from Dorsal column sensation ?

Gracil & cunate for fine touch & deep sensation

Write R of touch sensation:

1- free nerve ending 2- meissner’s corpuscles ينقل ويتعب بسرعة ``` 3- merkel’s corpuscles 4- merkrl’ disc 5- hair end organs 6 - paccinian corpuscles (ينقل ويتعب بسرعة) 7- spry type ending ```

R for crude touch

Free n ending | Hair end organ

R for fine touch

Meissner’s corpuscles and | merkel disc

R of pressures sense

Pacinian corpuscles : rapidly acting | Raffini ending : slowly acting

1- R of Tenson sense ? | 2- R of vibration

1- Golgi tendon organs | 2- pacinian and meissner’s واحد عنده frequency عالي والاخر بطئ

Which of the following is the effect of activation of gamma motor neuron during initiation of voluntary movement?

A) Direct stimulation of extrafusal muscle ﬁbers. B) Indirect coactivation of alpha motor neuron.✅ C) Inhibition of intrafusal muscle ﬁbers. D) Inhibition of the spinal segment interneurons.

A 10-year-old girl with Type I diabetes develops a neuropathy limited to sensory neurons with free nerve endings. Quantitative sensory testing will reveal higher than normal thresholds for the detection of which of the following sensations?

A) Fine touch. B) Vibration. C) Pressure. D) Pain.✅ E) Muscle length.

The postcentral gyrus and dorsal column are essential for which of the following physiological phenomenon?

A) Vision. B) Olfaction. C) Two-point discrimination.✅ D) Voluntary movement. E) Auditory identiﬁcation.

Which of the following characteristics of an axon is most dependent on its diameter? .

A)Magnitude of its resting membrane potential. B)Duration of its refractory period. C)Conduction velocity of its action potential.✅ D)Overshoot of its action potential. Activity of its sodium potassium pump

The membrane potential will depolarize by the greatest amount if the membrane permeability increases for which of the following ions?

A) Sodium.✅ B) Potassium C) Chloride. D) Calcium

Which of the following best describes an expanded tip tactile receptor found in the dermis of hairy skin that is specialized to detect continuously applied touch sensation?

A) Free nerve endings. B) Merkel disk C) Pacinian corpuscle.✅ D) Rufﬁni endings

The release of neurotransmitter at a chemical synapse in the CNS is dependent upon which of the following physiological processes?

A) Synthesis of acetylcholinesterase B) Hyperpolarization of the synaptic terminal. C) Opening of ligand gated sodium channels. D) Inﬂux of calcium into the presynaptic terminal✅

Which of the following best describes the concept of speciﬁcity in sensory nerve ﬁbers that transmit only one modality of sensation?

. A) Frequency coding principle. B) Concept of speciﬁc nerve energies. C) Singularity principle. D) Labelled line principle✅

Which of the following substances enhances the sensitivity of pain receptors but does not directly excite them?

A) Bradykinin. B) Prostaglandins✅ C) Serotonin. D) Potassium ions. E) Sodium ions.

An axon has resting membrane potential of-70 mv with hresholdof 50 amx What magnitude of depolarization (in mv) is necessary for this axon to produce a potential when it is receiving an IPSP of 10 mv? n acticn

A) 30✅ B) 20 C) 10 D) 5 E) 0

Which of the following circuits is responsible for helping the cerebral cortex to execute subconscious but learned movements as typing?

A. Papez B. Caudate C. Putamen D. Reverberatory

sensory receptors detect the intensity of a stimulus by which of the following mechanism?

A. by lowering the threshold for receptor stimulation B. by generating receptor potentials having higher magnitudes C. by generating nerve impulses transmitted along sensory ﬁbers at higher velocities D. by enhancing the central effects of sensory impulses

The area of representation of body structures in the primary somatosensory cortex is dependent on which of the following?

A. Number of receptors B. Size of receptors C. Weight of body part D. Surface area of body part

Damage to which of the following ﬁbers will lead to absent fast pain.. ....... response?

A. A alpha B. A beta C. A gamma D. A delta E. C

Which of the following extrapyramidal tracts controls precise di......... movements ?

A. Ventral reticulospinal B. Lateral reticulospinal C. Rubrospinal D. Tectospinal

- an autopsy from a patient with brain tumor shows : poorly defined gray-white mass in brain tissue and its microscopic appearance shows spindle-shaped cells with interlacing fibrillary processes, what type is it ?

Astrocytoma

Free nerve ending

Tonic R ( slowly adapting

What is type of Fibers in 1- Thermo-sensitive pain receptors 2- chemo sensitive pain receptors

1- A delata | 2- C

Physiology Flashcards

(71 cards)