What is the stroke volume of an adult human heart?

• 50 mL

• 70 mL

• 90 mL

• 100 mL

The heart is covered by

• epicardium

• pericardium

• supracardium

• endocardium

Select correct combination of statements for lymph.

I. It helps to maintain fluid balance of the body.

II. It is contained in lymphatic vessels and lymphatic organs in mammals.

III. It is derived from tissue fluid.

IV. It contains less antibodies than plasma.

V. Flows in both directions.

VI. It helps to conserve proteins and remove bacteria.

• I, II, III, V

• II, III, IV, VI

• I, IV, V, VI

• III, IV, V, VI

Each 100 mL of human arterial blood carries 'P' mL of O₂ and 'Q' mL of CO₂, whereas each 100 mL of venous blood carries 'R' mL of O₂ and 'S' mL of CO₂. Choose the correct values of P, Q, R and S.

• P =48 mL; Q=19 - 20 mL; R=52 mL; S = 14 - 15 ml

• P= 19 - 20mL; Q= 48 mL; R= 14 - 15mL; S =52 mL

• P = 14 - 15mL; Q = 52mL; R = 19 - 20 mL; S = 48mL

• P = 52 mL; Q =14 - 15mL; R = 48 mL; S = 19 - 20 mL

155.

Intrinsic and extrinsic pathways of blood clotting are interlinked at the activation steps of which of the following factors?

• Factor IX

• Factor IV

• Factor X

• Factor XIIIa

Which of the followings is/are correct for the inheritance of genes involved in human 'ABO' blood grouping?

• It is inherited by complete dominant allele

• It is inherited by complete recessive allele

• It is inherited by codominant allele

• It is inherited by single gene with more than two alleles

When a red blood cell loses water by osmosis the shrinking of the cell volume leads to crinkling of the plasma membrane, called

• Flacidity

• Bursting

• Crenation

• Tonicity

With refrence to the circulatory system of human foetus, which of the following statement is not correct?

• Ductus arteriosus connects the pulmonary artery to the aorta

• Foetal haemoglobin combines more readily with oxygen than adult haemoglobin does

• Ductus venosus carries blood from placenta and foetal gut directly to the fetal liver

• Blood is pumped to the placenta by the foetal heart

The integral membrane protein that carries blood group antigenic determinants is

• Rhodopsin

• Seipin

• Glycophorin

• CD36

Identify the incorrect statements.

I. Members of gastropoda exhibit 'torsion'.

II. Aristotle lantern is present in heart urchins.

III. Anthozoans are polyploid forms.

IV. Diplopoda includes centipedes.

• II and III

• III and Iv

• II and IV

• I and II