The document describes the main types of tissues in the human body. There are four primary tissue types - epithelial, connective, muscle and nervous tissue. Epithelial tissues cover the internal and external surfaces of the body and include several subtypes based on the number of cell layers and shapes. Connective tissues bind and support other tissues and include subtypes such as bone, cartilage and blood. Muscle tissues are involved in body movement and include skeletal, cardiac and smooth muscle. Nervous tissue forms the nervous system and contains specialized nerve cells called neurons.