Final answer:
All organs in the human body are made up of two or more tissue types, integrating complex functions of various cell types. This composition allows them to perform specific physiological roles necessary for the body's function and health.
Step-by-step explanation:
True of all organs in the human body is that they are composed of two or more tissue types. An organ is a complex structure that integrates different types of tissues which perform specific physiological functions. Tissues, in turn, are collections of similar cells that work together for a common purpose. There are four main types of tissues in the human body: epithelial, connective, muscle, and nervous tissue. Each type has a specialized role, from covering surfaces and protecting the body to enabling movement and transmitting nerve signals.
The statement that organs produce red and white blood cells, remove harmful substances from the body, or are composed of one main type of cell, does not apply universally to all organs. While organs like the spleen and bone marrow do produce blood cells, and organs like the liver remove toxins, these functions are not characteristic of all organs. Additionally, while an organ is made predominantly of one or more predominant tissue types, they are not composed of one main type of cell due to the complexity and diversity of cell types required for the function of each organ.