What name is given to the sac, which surrounds and protects the heart?

Answer 1

The sac which surrounds the heart is called the PERICARDIUM

Here is the dictionary definition of "pericardium"
per·i·car·di·um
The membrane enclosing the heart, consisting of an outer fibrous layer and an inner double layer of serous membrane.

Here is a graphic showing the pericardium around the heart

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Answer 2

Pericardium.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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