Test Bank for Principles of Human Physiology 5th Edition By Stanfield Chapter 1 1) The smallest living units capable of carrying out their own basic life functions are called A) cells. B) organelles. C) organs. D) organ systems. E) tissues. Answer: A 2) Cells are classified into which of the following four broad categories? A) squamous, cubodial, columnar, and basement membranes B) endocrine, nervous, integumentary, and reproductive C) atoms, tissues, organs, and organ systems D) n...