Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?

(a) They do not need to reproduce
(b) They are somatic cells
(c) They do not metabolize
(d) All their internal space is available for oxygen
transport

• Only (d)

• Only (a)

• (a), (c) and (d)

• (a), (c) and (d)

Match the items given in Column I with those in Column II and select the correct option given below:

column i		column ii
a	Tricuspid valve	i	Between left atrium and left ventricle
b	Bicuspid valve	ii	Between right ventricle and pulmonary artery
c	Semilunar valve	iii	Between right atrium and right ventricle

• a	b	c
  iii	i	ii

• a	b	c
  i	iii	ii

• a	b	c
  ii	i	iii

• a	b	c
  i	ii	iii

Match the items given in Column I with those in Column II and select the correct option given below:

Column i		Column ii
a	Tidal volume	i	2500 – 3000 mL
b	Inspiratory Reserve volume	ii	1100 – 1200 mL
c	Expiratory Reserve volume	iii	500 – 550 mL
d	Residual volume	iv	1000 – 1100 mL

• a	b	c	d
  iii	ii	i	iv

• a	b	c	d
  iii	i	iv	ii

• a	b	c	d
  iv	iii	ii	i

• a	b	c	d
  i	iv	ii	iii

Match the items given in Column I with those in Column II and select the correct option given below:

Column I		Column II
a	Fibrinogen	i	Osmotic balance
b	Globulin	ii	Blood clotting
c	Albumin	iii	Defence mechanism

• a	b	c
  iii	ii	i

• a	b	c
  i	ii	iii

• a	b	c
  ii	iii	i

• a	b	c
  i	ii	iii

45.

Oxygen dissociation curve of haemoglobin is 

• sigmoid

• hyperbolic

• linear

• hypobolic

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

• Factor IX

• Factor IV

• Factor X

• Factor XIII-a

Foramen ovale

• connects the two atria in the foetal heart.

• is a condition in which the heart valves do not completely close

• is a shallow  depression in the inter-ventricular septum

• is a connection between the pulmonary trunk and the aorta in the foetus.

Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin?

• Neutrophils

• Basophils

• Eosinophils

• Monocytes

Universal donor is

• O Rh⁺­

• O Rh^–­

• AB Rh⁺­

• AB Rh^–­

If a child is of O blood group and his father is of B blood group, the genotype of father is

• I^O I^O

• I^A I^B

• I^O I^B

• I^O I^A