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PHYSIOLOGY HUBs

28 Jun, 09:42

152.Explanation

Correct Answer - C
Ans. is 'c' i.e., Increased end-diastolic volume and decreased endsystolic volume
The stroke volume is the amount of blood pumped out by left
ventricle in each stroke.
Stroke volume is given by the difference between end-diastolic
ventricular volume (the volume of blood in the left ventricle at the
end of diastole; normal 120 inl) and end-systolic ventricular volume
(the volume of blood at the end of systole; normal 50 ml).
Stroke volume (70 ml) = End-diastolic ventricular volume (120 ml) -
End-systolic ventricular volume (50 ml)

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25 Jun, 03:58

151.Explanation

Correct Answer - B
Ans. is 'b' i.e., Transfer of iron into enterocytes
Hepcidin is an iron metabolism regulatory hormone that inhibits iron
absorption (transfer of iron into enterocytes).
Ascorbic acid (vitamin C) forms soluble complexes with iron
and reduces iron from the ferric to the ferrous state,
thereby enhancing iron absorption.
Tannins, present in tea, form insoluble complexes with iron
and lower its absorption

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15 Jun, 11:47

150.Explanation

Correct Answer - C
Ans. is 'c' i.e., Sertoli cells
Antimullerian hormone or Mullerian inhibiting substance is secreted
by sertoli cells.

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10 Jun, 11:49

149.Explanation

Correct Answer - C
Ans. is `c' i.e., Tubulin

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08 Jun, 12:22

148.Explanation

Correct Answer - C
Ans. is 'c' i.e., Facter VII

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06 Jun, 15:36

147.Explanation.
Correct Answer - C
Pro-opiomelanocortin (POMC) comprises 285 amino acid residues
(MW 31000) and serves as a precursor of many
proteins/polypeptide.
Derivatives of POMC are:-
i) Pituitary hormones: ACTH, MSH
ii) β-lipotropic hormone (β-LPH)
iii) γ-lipotropic hormone (γ-LPH)
iv) β-endorphin
v) CLIP (corticotropin-like intermediate lobe peptide).

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04 Jun, 16:23

146.Explanation

Correct Answer - B
Ans. is 'b' i.e., Olfactory bulb
The sensory receptors for olfaction (smell) are located in the
olfactory mucous membrane. In human, the olfactory mucous
membrane (olfactory neuroepithelium) located in the roof of the
nasal cavity near the septum. Because of its location high in the
nasal cavity, the olfactory mucosa is not directly exposed to the flow
of inspired air entering the nose.
The olfactory mucosa contains olfactory receptors. The olfactory
receptors are unique in that the receptor cell itself is a neuron. The
olfactory receptor cell has cilia projecting in the nasal mucosa which
act as receptor for olfaction (These are dendrites of neuron/receptor
cells). The axons of olfactory neuron (olfactory receptor cells) form
olfactory nerve which passes through cribriform plate and terminates
in the olfactory bulb. In olfactory bulb axons of olfactory nerve
synapse with dendrides of mitral cells to form the olfactory glomeruli.
Mitral cells are the principal output neurons of olfactory bulb and
their axons form the olfactory tract.
The olfactory bulb also contains periglomerular cells, which are
inhibitory neurons and granule cells which have no synapse and
make reciprocal synapses with mital and tufted cells.
Like the taste fibers, olfactory tract also projects to the primitive partsof the brain as well as the neocortex. The projections to the primitive
parts are principally to the pyriform area (olfactory cortex), amygdala
and entorhinal cortex, which in turn projects to the hippocampus.
The pathway to the neocortex involves a relay in the olfactory
tubercle, and then in the thalamus, the output of which projects to
the orbitofrontal cortex.

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02 Jun, 15:17

145.Explanation

Correct Answer - C
Ans. is 'c' i.e., cGMP

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31 May, 15:51

144.Explanation

Correct Answer - B
Ans. is 'b' i.e., Pain & temperature
Pain and temperature are primarily appreciated by the thalamus.
For other forms of sensation, the thalamus is unable to analyze the
details of sensations.
Fibers carrying tactile and proprioceptive information ascend through
the thalamocortical pathway to area 3 of primary somatic sensory
cortex through the thalamic radiation.
Therefore, if the somatosensory cortex is removed, tactile
sensations and proprioceptions are lost, but pain and temperature
sensations persist.

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