Halima Mahmoud
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Halima Mahmoud
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MATH 2019 TEST

Question 1 of 15

1

True about ​Myopia​: (short/nearsightedness)

Select one or more of the following:

  • A) Focal length of the eyeball is too long

  • B) Focal length of the eyeball is too short

  • C) Objects far away can be seen well

  • D) I think there was something about “far away objects are focused ... on the retina and near objects are focused ... on the retina?

  • E) Far point can be 1m away​

Explanation

Question 2 of 15

1

9. Visual acuity:

Select one or more of the following:

  • A) Depends on the state of rods

  • B) Means the distance of ... and 1 arc

  • C) Depends on the visual field

  • D) Can be impaired by defects of focusing

Explanation

Question 3 of 15

1

True about gamma motor neuron

Select one or more of the following:

  • A) They maintain activity of Ia afferent

  • B) They detect the length of extrafusal muscle fibres

  • C) They produce contraction of nuclear bag and chain fibres

  • D) They stimulate the activity of Ib fibres

Explanation

Question 4 of 15

1

​Multi​ unit smooth muscle

Select one or more of the following:

  • A) Elicited by postganglionic neurons

  • B) Elicited by nicotinic receptor

  • C) Same distance as intramuscular conduction (something like that)

  • D) Gap junction ... affected by smooth muscle

Explanation

Question 5 of 15

1

15. Location of cholinergic receptors:

Select one or more of the following:

  • A) Endocrine cells of medulla of adrenal gland

  • B) Sarcolemma of smooth muscle cells of urinary bladder

  • C) Sarcolemma of skeletal muscle cells

  • D) Sarcolemma of smooth muscle cells of systemic veins

  • E) Sarcolemma of visceral smooth muscle cells of gallbladder​

Explanation

Question 6 of 15

1

22. What statement is ​right​ concerning ​beta​ rhythm:

Select one or more of the following:

  • B) Low frequencies high amplitude in NREM sleep

  • C) Forms sleep spindles in EEG

  • D) Appears over occipital lobes when eyes are closed

  • E) Measured mostly on frontal lobe for conscious thought

Explanation

Question 7 of 15

1

Sympathetic system:

Select one or more of the following:

  • A) Contraction of smooth muscles of vessel by alpha 1-Adrenergic receptor

  • B) Decrease dilation of bronchi by beta 2-adrenergic receptor

  • C) Increased liberation of epinephrine mediated by alpha1

  • D) Decrease contraction of gastric sphincter by beta 1-adrenergic receptor

Explanation

Question 8 of 15

1

8. True about the phenomena of beginning of depolarisation of skeletal muscl

Select one or more of the following:

  • A) Nicotinic receptor generates action potential on motor neuron end plate

  • B) ACh generates end plate potenial

  • C) Muscarinic M1 —> IPSP on motor end plates

  • D) EPP on sarcolemma by ligand gated channels (Ryanodine receptors)

Explanation

Question 9 of 15

1

14. Which are part of the withdrawal reflex arc:

Select one or more of the following:

  • A) Excitatory interneuron

  • B) Alpha neuron

  • C) Golgi tendon organ

  • D) Muscle spindle

  • E) D alpha input

  • F) 1 alpha input

Explanation

Question 10 of 15

1

16. Dark adaptation of the eye:

Select one or more of the following:

  • A) Degeneration of rhodopsin

  • B) Regeneration of light sensitive of rhodopsin

  • C) Constriction of pupil

  • D) Dilation of pupil

  • E) Increased sensitivity of retina for light

Explanation

Question 11 of 15

1

-18. What is right about audition:

Select one or more of the following:

  • A) Stereo-cilia bend towards kinocilium, this causes opening of potassium channels (cell discharge more frequently)

  • B) Behind scala media vibration causes 20Hz

  • C) Impulse goes to cochlear nerve...

Explanation

Question 12 of 15

1

-21. In synaptic transmission:

Select one or more of the following:

  • A) End plate potential is produced by ligand-gated sodium channels

  • B) Calcium ions enter axon terminal through voltage gated channels

  • C) Calcium mediates resynthesis of neurotransmitters

  • D) Presynaptic inhibition mediated by inhibitory transmitter as GABA
    producing IPSP in axon terminal other than neuron, Such process
    decreases ability of axon to conduct action potential

Explanation

Question 13 of 15

1

-25. Graded action potential — find true:

Select one or more of the following:

  • A) Develops in axon hillock

  • B) Develops outside of axon hillock

  • C) Native nicotinic receptor

  • D) EPP is an example of IPSP

Explanation

Question 14 of 15

1

12. Rhodopsin:

Select one or more of the following:

  • A) Composed of transducer and photopsin

  • B) Ionotropic receptor of the free floating disc of the outer segment of the rods

  • C) More sensitive to light than photopsin

  • D) Mechanoreceptor of coupled G-protein

Explanation

Question 15 of 15

1

6. Auditory pathway — correct order:
A) Inferior colliculus - ​
B) Neurons of medial geniculate nucleus - ​
C) Neurons of spiral ganglia - ​
D) Cochlear nucleus (ventral + dorsal) - ​
E) Superior olive - ​
F) Cortex (Brodmanns 41) - ​

Select one or more of the following:

  • A, C, B, D, F, E

  • C, D, A, E, B, F

  • A, B, C, E, D, F

  • C, F, A, B, E, D

Explanation

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