Question 246: The parvocellular pathway from lateral geniculate nucleus to visual cortex is most sensitive for the stimulus of ?
A) Color contrast
B) Luminance contrast
C) Temporal frequency
D) Saccadic eye movements
Answer: A) Color contrast
Q247: The fibers from the contralateral nasal
hemiretina project to the following layers of the lateral geniculate nucleus ?
A) Layers 2, 3 & 5
B) Layers 1, 2 & 6
C) Layers 1, 4 & 6
D) Layers 4, 5 & 5
Answer: C) Layers 1, 4 & 6
Q248: All endothelial cells produce thrombomodulin
except those found in ?
A) Hepatic circulation
B) Cutaneous circulation
C) Cerebral circulation
D) Renal circulation
Answer: C) Cerebral circulation
Q249: S.A. node acts as a pacemaker of the heart
because of the fact that it ?
A) Is capable of generating impulses spontaneously
B) Has rich sympathetic innervations
C) Has poor cholinergic innervations
D) Generates impulses at the highest rate
Answer: D) Generates impulses at the highest rate
Q250: The first physiological response to high
enviornmental temperature is ?
A) Sweating
B) Vasodilation
C) Decreased heat production
D) Non-shivering thermogenesis
Answer: B) Vasodilation
Q251: All of the following factors normally increase
the length of the ventricular cardiac muscle fibres except ?
A) Increased venous tone
B) Increased total blood volume
C) Increased negative intrathoracic pressure
D) Lying-to-standing change in posture
Answer: D) Lying-to-standing change in posture
Q252: The vasodilatation produced by carbondioxide
is maximum in one of the following ?
A) Kidney
B) Brain
C) Liver
D) Heart
Answer: B) Brain
Q253: Which one of the following statements is true
regarding water reabsorption in the tubules ?
A) The bulk of water reabsorption occurs secondary to Na+
reabsorption
B) Majority of facultative reabsorption occurs in proximal
tubule
C) Obligatory reabsorption is ADH dependent
D) 20% of water is always reabsored irrespective of water
balance
Answer: A) The bulk of water reabsorption occurs secondary
to Na+ reabsorption
Q254: Urinary concentrating ability of the kidney is
increased by ?
A) ECF volume contraction
B) Increase in RBF
C) Reduction of medullary hyperosmolarity
D) Increase in GFR
Answer: A) ECF volume contraction
Q255: Distribution of blood flow is mainly regulated
by the ?
A) Arteries
B) Arterioles
C) Capillaries
D) Venules
Answer: B) Arterioles
Q256: In which of the following a reduction in
arterial oxygen tension occurs ?
A) Anaemia
B) CO poisoning
C) Moderate exercise
D) Hypoventilation
Answer: D) Hypoventilation
Q257: Neuronal degeneration is seen in all of the
following except ?
A) Crush nerve injury
B) Fetal development
C) Senescence
D) Neuropraxia
Answer: D) Neuropraxia
Q258: With which one of the following Lower motor
neuron lesions are associated ?
A) Flaccid paralysis
B) Hyperactive stretch reflex
C) Spasticity
D) Muscular incoordination
Answer: A) Flaccid paralysis
Q259: Aspermia is the term used to describe ?
A) Absence of semen
B) Absence of sperm in ejaculate
C) Absence of sperm motility
D) Occurence of abnormal sperm
Answer: A) Absence of semen
Q260: Which of the following statements can be
regarded as primary action of Inhibin ?
A) It inhibits secretion of prolactin
B) It stimulates synthesis of estradiol
C) It stimulates secretion of TSH
D) It inhibits secretion of FSH
Answer: D) It inhibits secretion of FSH
Q261: The main site of bicarbonate reabsorption is ?
A) Proximal convoluted tubule
B) Distal convoluted tubule
C) Cortical collecting duct
D) Medullary collecting duct
Answer: A) Proximal convoluted tubule
Q262: CO2 is primarily transported in the arterial
blood as ?
A) Dissolved CO2
B) Carbonic Acid
C) Carbamino-hemoglobin
D) Bicarbonate
Answer: D) Bicarbonate
Q263: Barr body is found in the following phase of
the cell cycle ?
A) Interphase
B) Metaphase
C) G1 phase
D) Telophase
Answer: A) Interphase
Q264: The type of hemoglobin that has least affinity
for 2,3-Diphosphoglycerate (2,3 DPG) or (2,3-BPG) is ?
A) Hb A
B) Hb F
C) Hb B
D) Hb A2
Answer: B) Hb F
A) Intermediate filaments
B) Actin
C) Tubulin
D) Myosin
Answer: A) Intermediate filaments
Q266: Heme is converted to bilirubin mainly in ?
A) Kidney
B) Liver
C) Spleen
D) Bone Marrow
Answer: C) Spleen
Q267: Pulmonary surfactant is secreted by ?
A) Type I pneumocytes
B) Type II pneumocytes
C) Clara cells
D) Bronchial epithelial cells
Answer: B) Type II pneumocytes
