For a tissue or an organ to function as a unit, ________.
A) there must be a signal molecule recognized by all cells in the tissue or organ
B) there must be cell-cell communication among the cells within a tissue or organ
C) the tissue or organ must perform similar functions
D) the tissue or organ must be composed of all of the same type of cells

Question

Quizplus · Accepted Answer

Cell-cell communication is necessary for cells to coordinate their activities and function as a unit within a tissue or organ. This communication can occur through direct contact between cells or through signals transmitted through the extracellular matrix or via chemical messengers like hormones. Therefore, option B is the correct answer. Option A is incorrect because signal molecules are not always required for cells to function as a unit. Option C is incorrect because tissues and organs can perform diverse functions and still function as a unit (e.g., liver performs roles in digestion, metabolism, and storage). Option D is incorrect because different cell types can work together within a single organ or tissue to perform a specific function.

For a Tissue or an Organ to Function as a Unit