11 - physiology new mcqs - part 5

41q. ventilation perfusion ratio is maximum at ?

 

1. apex of lung
2. base of lung
3. posterior lobe of lung
4. middle of the lung

 

answer: a . apex of lung .

 

42q. apnoea is defined as ?

 

1. stoppage of heart beat
2. cessation of respiration
3. irregular respiration
4. RR

 

Answer: b . cessation of respiration .

 

43q. the neurons may get irreversibly damaged if exposed to significantly hypoxia for ?

 

1. 8 minutes
2. 2 minutes
3. 30 seconds
4. 15 seconds

 

Answer: a . 8  minutes .

 

44q. which of the following is not a vitamin K dependent factor ?

 

1. factor 2
2. factor 7
3. factor 8
4. factor 10

 

answer: c . factor 8 . vitamin K dependent factors are 2,7,9,10 , protein C and protein S .

 

45q. life span of neutrophils is ?

 

1. 6 hours
2. 6 days
3. 10 days
4. 15 days

 

Answer: a . 6 hours .

 

46q. life span of neonatal RBC is ?

 

1. 100 days
2. 120 days
3. 6 months
4. 1 year

 

Answer: a . 100 days .

 

47q. plasma sodium concentration is ?

 

1. 120 meq/l
2. 3.5 meq/l
3. 140 meq/l
4. 110 meq/l

 

Answer: c . 140 meq/l .

 

48q. cardiac index in a normal person is ?

 

1. 2.1
2. 3.2
3. 4.6
4. 5.9

 

Answer: b . 3.2 . cardiac output divided by total surface area of the body .

 

49q. alkali resistant hemoglobin is ?

 

1. Hb A
2. Hb A , C
3. Hb S
4. Hb F

 

Answer: d . Hb F .

 

50q. blood brain barrier is deficient at ?

 

1. area postrema
2. thalamus
3. meta thalamus
4. cerebellum

 

answer: a . area postrema 

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 .