The frequency of cardiac muscle contraction is determined by the activity of
pacemaker cells. These generate spontaneous action potentials.
The SA node (sinoatrial): this is a specialized group of cardiac muscle
cells that dont contract. W
There are five types of intercellular junctions: Tight Junctions, adherens junctions, desmosomes,
hemidesmisomes and gap junctions.
junction is where the plasma membranes of adjacent cells are fused together. These
Covering Epithelial Tissue
Epithelial tissue is one of the main four tissue types in the body. It covers the whole surface of the
body and is also specialized to form the lining on all internal and external body surfaces. Epithelial
cells are packed tight