Which vertebrate orgen receives only oxygenated blood?

• Gill

• Lung

• Spleen

• Liver

G-6-P dehydrogenase deficiency is associated with haemolysis of

• lymphocytes

• RBCs

• platelets

• leucocytes

The first heart sound is produced when

• diastole begins

• semilunar valve close quickly

• interventricular pressure decrease

• bicuspid and tricuspid valve close quickly

The epithelial lining in the alveoli of the frogs facing lung cavity is

• squamous ciliated

• columnar ciliated

• columnar nonciliated

• squamous nonciliated

In diastole, heart is filled by

• mixed blood

• venous blood

• oxygenated blood

• deoxygenated blood

RBC's are nucleated in

• man

• rat

• frog

• rabbit

Which of the following substances, if introduce in the blood stream, would cause coagulation, at the site of its introduction?

• Fibrinogen

• Prothrombin

• Heparin

• Thromboplastin

Haemophilia is more commonly seen in human males than in human females because

• this disease is due to an X- linked dominant mutation

• a greater proportion of girls die in infancy

• this disease is due to an X- linked recessive mutation

• this disease is due to a Y- linked recessive mutation

Heparin is secreted by

• mast cell

• alveolar cell

• plasma cell

• goblet cell

CO is harmful to human being because

• it decreases CO₂ concentration

• it competes O₂ to combine with haemoglobin

• it is carcinogenic

• it depletes O₂ layer