Final answer:
A tissue is a group of connected cells with similar functions. The four basic types of human tissues are epithelial, muscle, nervous, and connective tissues. Organs are made up of different tissues working together.
Step-by-step explanation:
A tissue is a group of connected cells that have a similar function. There are four basic types of human tissues that make up all the organs of the human body: epithelial, muscle, nervous, and connective tissues.
Epithelial tissue is made up of layers of tightly packed cells that line the surfaces of the body, such as the skin and lining of the digestive system. Connective tissue supports and binds other tissues, and examples include tendon and bone. Muscle tissue is responsible for movement, while nervous tissue senses stimuli and transmits signals.
An organ is a structure made of two or more tissues that work together to perform specific functions. The heart, for example, is made up of all four types of tissues.