The correct answer is option 1: "The wounds of the face bleed profusely because of its rich vascularity." This means that the face has a lot of blood vessels, which can lead to heavy bleeding if an injury occurs.

Option 2: "It is close to the heart" does not directly explain why the wounds of the face bleed profusely. While it is true that the face is relatively close to the heart, the proximity to the heart does not necessarily determine the extent of bleeding.

Option 3: "Its skin is soft" is not the main reason why the wounds of the face bleed profusely. Soft skin may be more prone to cuts, but it does not directly influence the amount of bleeding.

Option 4: "Fast contraction of facial muscles" also does not explain why the wounds of the face bleed profusely. While facial muscle contraction may contribute to the spread of blood in the area, it is not the primary reason for profuse bleeding.

Therefore, option 1, which states that the face bleeds profusely due to its rich vascularity, is the most accurate explanation for the given question.