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In all vertebbrates the circulatory system utilizes following transport media:

A.	Blood	B.	Lymph
C.	Both of these	D.	None of these

Blood transports:

A.	Oxygen only	B.	Nutrients and nitrogen wastes
C.	Respiratory gases, nutrients and nitrogenous waste	D.	Respiratory gases and nitrogenous wastes

One of the peculiar feature of cardiac muscles forming myocardium of heart is that:

A.	They work involuntarily	B.	They are both striped, unstriped and branched
C.	They never undergo fatigue	D.	They have all these properties

Heart is made up of:

A.	Epicardium	B.	Myocardium
C.	Endocardium	D.	All of these structures

A cavity surrounding the heart is called:

A.	Peritoneal cavity	B.	Pericardial cavity
C.	Perichondrial cavity	D.	Perineural cavity

Heart in frog lies within:

A.	Thoracic cavities	B.	Abdominal cavity between two fore limbs
C.	Mediastinal space	D.	None of these

In between the thoracic cavities the space containing heart in rabbit is called:

A.	Pleura	B.	Mediastinum
C.	Diaphragm	D.	None of these

Heart in frog has certain chambers which are not found in rabbit:

A.	Auricles	B.	Ventricles
C.	Sinus venosus and conus arteriosus	D.	None of these

Sinus venosus is formed by union of:

A.	Two precavals	B.	One postcaval
C.	All of these	D.	None of these

10.

Opening of pulmonary veins in the left auricle do not carry any valve but there is no back-flow or blood while left auricle contracts because of the fact that:

A.	Valves in pulmonary veins check back flow	B.	Contraction of left auricle automatically closes the opening of pulmonary veins
C.	Inter-auricular septum helps to close the opening	D.	There is some other reason