281.
What is true about RBCs in humans?
A
They carry about 20-25 per cent of $$C{O_2}$$
B
They transport 99.5 per cent of $${O_2}$$
C
They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma
D
They do not carry $$C{O_2}$$ at all
Answer :
They carry about 20-25 per cent of $$C{O_2}$$
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282.
"Bundle of His" are
A
Nervous tissue supplied ventricles
B
Nervous tissue supplied to heart
C
Muscular tissue supplied to ventricle
D
Musclular tissue supplied to heart
Answer :
Muscular tissue supplied to ventricle
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283.
The colour of lymph is
A
White
B
Pale yellow
C
Coloueless
D
Milky
Answer :
Coloueless
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284.
Fully digested food reaches to liver by
A
Hepatic portal vein
B
Hepatic artery
C
Hepatic vein
D
All of the above
Answer :
Hepatic portal vein
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285.
Neurogenic heart is characteristic of
A
Humans
B
Lower in vertebrates
C
Rat
D
Rabbit
Answer :
Lower in vertebrates
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286.
Bicuspid valve (mitral) guards the opening in mammals between
A
Left atrium and left ventricle
B
Pulmonary vein and left auricle
C
Stomach and intestine
D
Right atrium and right ventricle
Answer :
Left atrium and left ventricle
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287.
Which one of the following statements is incorrect ?
A
The presence of non-respiratory air sacs, increases the efficiency of respiration in birds
B
In insects, circulating body fluids serve to distribute oxygen to tissues
C
The principle of countercurrent flow facilitates efficient respiration in gills of fishes
D
The residual area in lungs slightly decreases the efficiency of respiration in mammals
Answer :
In insects, circulating body fluids serve to distribute oxygen to tissues
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288.
Which of the following is congenital heart desease
A
Patent ductus arteriosus
B
Patent foramen ovale
C
Ventricular septal defect
D
All of the above
Answer :
All of the above
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289.
The QRS complex in a standard ECG represents
A
Depolarisation of auricles
B
Depolarisation of ventricles
C
Repolarisation of ventricles
D
Repolarisation of auricles
Answer :
Depolarisation of ventricles
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290.
A renal portal system is found in
A
Rabbit
B
Mouse
C
Horse
D
Frog
Answer :
Frog
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