Published:   20-Sep-2020

(a) Epicardium is the innermost layer of heart
(b) There are one pair of atrium in heart
(c) The contraction of heart ventricle is diastole
(d) The relaxation of heart ventricle is systole
Answer: There are one pair of atrium in heart
SSC | Subject : Biology | Chpater : Transport in Organisms
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