The first heart sound is produced when
diastole begins
semilunar valve close quickly
interventricular pressure decrease
bicuspid and tricuspid valve close quickly
D.
bicuspid and tricuspid valve close quickly
During working of heart two sounds are produced lub and dub. First sound (i.e., lub) is produced when auriculoventricular (tricuspid and bicuspid) valves are closed or at the end of diastole. The second sound (i.e., dub) is produced when semilunar valves at the base of dorsal aorta are closed or at the end of systole.
G-6-P dehydrogenase deficiency is associated with haemolysis of
lymphocytes
RBCs
platelets
leucocytes
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
The epithelial lining in the alveoli of the frogs facing lung cavity is
squamous ciliated
columnar ciliated
columnar nonciliated
squamous nonciliated
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
