Explain the following terms. (1 mark each) (a) Pericardium (b) Cardiac impulse (c) Mediastinum (d) Haematocrit (e) Mitral valve

(a) Pericardium: Pericardium is a protective sac that surrounds the heart and consists of two layers, an outer fibrous layer and an inner serous layer. The pericardium helps to protect the heart from external shocks and provides a lubricated surface for the heart to beat against.

(b) Cardiac impulse: _________ __________ _______ ____ _______ ___ ________ ____ _________ _________ ___.
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