The heart is covered by
epicardium
pericardium
supracardium
endocardium
B.
pericardium
The heart is covered by pericardium. The pericardium is a double-walled sac containing the heart and the roots of the large vessels. It has two layers, a serous layer and a fibrous layer. It encloses the pericardial cavity which contains pericardial fluid. The pericardium fixes the heart to the mediastinum, gives protection against infection, jerk or shock and provides the lubrication for the heat.
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
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
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
The integral membrane protein that carries blood group antigenic determinants is
Rhodopsin
Seipin
Glycophorin
CD36
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
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
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
