In short
A tissue is a group of similar cells that work together to do one job. Tissues join to form organs, and organs join to form organ systems.
Animals have four main kinds of tissue. Epithelial tissue covers surfaces and lines organs. Connective tissue joins and supports, and includes bone, cartilage, fat and blood. Muscle tissue contracts to cause movement. Nervous tissue carries messages. Plants have meristematic tissue, which divides, and permanent tissue, which does not, including xylem and phloem.
The stomach has muscle tissue to churn food, epithelial tissue lining it, connective tissue holding it together and nervous tissue controlling it. Together these make one organ.
Also searched as: tissue epithelial, muscle and nervous tissues.
Pick your exam to see its syllabus, where you stand in each unit and what to practise next.
See exam preparation