10 - physiology new mcqs - part 4

31q. the first physiological response to high environmental temperature is ?

 

1. sweating
2. vasodilatation
3. decreased heat production
4. non-shivering thermogenesis

 

answer: b . vasodilatation .

 

32q. location of osmoreceptor is the ?

 

1. wall of atria
2. anterior hypothalamus
3. juxta glomerular apparatus
4. wall of veins

 

answer: b . anterior hypothalamus .

 

33q. injection of hypertonic saline in which region of the hypothalamus produces intense thirst ?

 

1. posterior region
2. paraventicular
3. preoptic
4. supraoptic

 

answer: c . preoptic . increased thirst is produced by stimulation of thirst centre in the preoptic nucleus of hypothalamus .

 

34q. the main excitatory neurotransmitter in the CNS is ?

 

1. glycine
2. acetyl choline
3. aspartate
4. glutamate

 

answer: d . glutamate .

 

35q. the inhibitory neurotransmitter in CNS neurons is ?

 

1. glutamate
2. aspartate
3. GABA
4. Taurine

 

Answer: a . GABA .

 

36q. the first change occurring in a sharp cut nerve is ?

 

1. schawann cells proliferation
2. degeneration of myelin sheath
3. chromatolysis
4. degeneration of neurilemma

 

answer: b . degeneration of myelin sheath .

 

37q. which of the following is an aminoneurotransmitter ?

 

1. acetyl choline
2. GABA
3. Lignocaine
4. Epinephrine

 

Answer: b . aminoneurotransmitters are nothing but neurotransmitters which are aminoacids . excitatory neurotransmitters are aspartate and glutamate . inhibitory neurotransmitters are glycine and GABA .

 

38q. unidirectional flow of a nerve impulse is at ?

 

1. synapse
2. axon
3. dendrites
4. all of the above

 

answer: a . synapse .

 

39q. myasthenia gravis is a disorder of ?

 

1. motor neuron
2. neuromuscular junction
3. peripheral nerve
4. spinal cord

 

answer: b . neuromuscular junction .

 

40q. twitch of a single motor unit is called ?

 

1. myoclonic jerk
2. fasciculation
3. tremor
4. chorea

 

answer: b . fasciculation .