Bicuspid and tricuspid valves are attached with inelastic fibres to the papillary muscles in the lumen of the ventricles. These fibres are . . . . . . .

Which of the following organs contains all four types of tissues?

Which organ is important as a large reservoir of erythrocytes?

Given below are two statements.
Statement $I$: Visceral layer of serous pericardium forms the outer wall of human heart.
Statement $II$: Epicardium is formed of a thick layer of cardiac muscles.
In the light of the above two statements,choose the correct answer from the options given below.

The pace-setter in the heart is called

Which one of the following is a matching pair?