Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

In which of the following subjects, the dead space is highest?

  • Old man

  • Old woman

  • Young man

  • Young woman


A.

Old man

Dead space is the air that is inhaled by the body in breathing, but does not take part in gas exchange. Not all the air in each breath is able to be used for the exchange of oxygen and carbon dioxide. About a third of every resting breath is exhaled exactly as it came into the body. In adults, it is usually in the range of 150 mL. In old man, there is low supply of blood to lungs than woman and hence, they have high dead space.Low supply of blood leads to carrying of less air (oxygen). So as increase in dead space.


12.

Which ribs show 'bucket-handle' type of movement?

  • Rib no. 1-2

  • Rib no. 3-5

  • Rib no. 6-10

  • Rib no. 11-12


C.

Rib no. 6-10

The intermediate ribs 6 and 7 show both pump handle and bucket handle types of movement. Movement of ribs eight to ten results in an outward and upward movement of their anterior ends.


13.

Name the hormone that stimulates the secretion of gastric juice.

  • Renin

  • Enterokinase

  • Enterogastrone

  • Gastrin


D.

Gastrin

Gastrin is a hormone that stimulates secretion of gastric acid (HCl) by the parietal cells of the stomach and aids in gastric motility.


14.

Which one has the thickest wall?

  • Right auricle

  • Right ventricle

  • Left auricle

  • Left ventricle


D.

Left ventricle

The thickness of the muscular wall of the left ventricle is much greater than that of the right because for the right ventricle force is relatively small as the blood goes only to the lungs which are very close to the heart. The left ventricle however, has to develop sufficient force to push blood around all the rest of the body.


15.

What is glycosuria?

  • Low amount of sugar in urine

  • Low amount of fat in urine

  • Average amount of carbohydrate in urine

  • High amount of sugar in urine


D.

High amount of sugar in urine

Glycosuria is the excretion of glucose into the urine. This is a rare condition in which the kidneys release glucose into the urine. Renal glycosuria can cause urine glucose levels to be high even if blood glucose levels are normal.


16.

Heparin is produced by

  • kidney cells

  • blood cells

  • bone marrow

  • Chief cell


B.

blood cells

Heparin is a glycosaminoglycan (mucopoly saccharide) with anticoagulant properties, occurring in vertebrate tissues, especially the lungs and blood vessels. Heparin salts are administered therapeutically to prevent or dissolve blood clots.


17.

Volume of urine is regulated by

  • aldosterone

  • aldosterone and testosterone

  • ADH

  • aldosterone and ADH


D.

aldosterone and ADH

Urine volume and concentration is regulated through the same processes that regulate blood volume. Antidiuretic hormone (ADH) produced by the posterior pituitary gland that increases the amount of water reabsorbed in the distal convulated tubule and collecting duct.


18.

Bile salts acts as activator of which enzyme?

  • Pepsinogen

  • Trypsinogen

  • Lipase

  • Pancreatic amylase


C.

Lipase

Bile lowers the surface tension of fat globules causing large drops to break up into tiny droplets (emulsification), enormously increasing surface area and assisting subsequent hydrolysis of fat by lipase.


19.

The cardiac cycle in normal subject is about

  • 0.5 s

  • 0.8 s

  • 1.0 s

  • 1.2 s


B.

0.8 s

Cardiac cycle is the sequence of events that occurs in the heart during one full heart beat. These events comprise contraction (systole) and relaxation (diastole) of the chambers of the heart, associated with opening and closing of the heart valves. At a resting heart rate, the human cardiac cycle lasts approximately 0.85 second, ie, 0.8 seconds.


20.

Which of the following cells produce HCl?

  • β- cell

  • α- cell

  • Oxyntic cell

  • Chief cell


C.

Oxyntic cell

Oxyntic cells or parietal cells are the stomach epithelium cells that secrete gastric acid and intrinsic acid ie, HCl.