tissue
Tissue, organ or system. Depends on what you mean by "a collection" of cells.
A cell is a Specialized when it performs a specific function.
A system.
A specialized cell is a cell that iis designed to do a specific function.
organelle -by jedzel
Every cell type have specialized proteins embedded in the plasma membrane making that cell specialized for a specific function. Muscle cells in our body are specialized for contraction. Nerve cells are specialized in conduction of messages.
Tissues
A group of specialized cells is called a tissue. Tissues are groups of cells that work together to perform a specific function in the body.
Organelles. Ex) cytoplasm, nucleus, ribosomes, mitochondria
Specialized cells are those that do a specific job or perform a specific function. For example, brain cells submit and store information. They do not however do the job of say, a skin cell, which is to protect an organism.
An organ is a collection of tissues that work together to carry out a specific function in a body. Organs are part of organ systems, which work together to maintain the overall function and health of the body.
The different types of tubes used for blood collection include serum tubes, plasma tubes, anticoagulant tubes, and specialized tubes for specific tests.