The heart is encased in a tough membranous sac called the ________.The heart is composed mostly of ________ muscle tissue, called the ________.

Name: The heart is encased in a tough membranous sac called the ________.The heart is composed mostly of ________ muscle tissue, called the ________.
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The Answer of The heart is encased in a tough membranous sac called the ________.The heart is composed mostly of ________ muscle tissue, called the ________.

The Heart Is Encased in a Tough Membranous Sac Called