Anatomy and Physiology assessment exam| 175 QUESTIONS| WITH COMPLETE SOLUTIONS

Levels of organization starting with Atoms and ending with Organism correct answer: The major levels of organization, from smallest to largest: a) Atoms, which are held together by chemical bonds to form b) Molecules (Examples: Proteins, lipids), which are the components of c) Organelles, the main structures within a living cell (Example: A nucleus is an organelle.) e) Cells, which are the basic units of life f) Tissues, which consist of groups of cells working together to carry out a specific function g) Organs, structures composed of two or more tissues carrying out a specific function I) Organ systems, groups of organs that carry out a specific function in an organism J) Organisms, individual living things Define Homeostasis correct answer: a) describes the maintenance of the internal environment of the organism even when there are changes in its external environment Describe Negative Feedback and how it maintains homeostasis correct answer: Organism senses a change in the internal environment a) Organ systems temporarily adjust their functions to return internal environment to the set point b) Example: When human blood pressure is elevated, the brain senses the change and causes the heart to slow until pressure returns to a normal level. Positive feedback correct answer: Organism senses a change in the internal environment a) Response to change increases as time progresses b) Example: During childbirth, a woman's uterine contractions increase in intensity until her child is delivered. Integumentary system correct answer: a) Includes skin (and related organs, such as glands), nails, and hair b) Some major functions: 1) Protection from environment 2) Retention of water 3) Sensation 4) Regulation of body temperature 5) Synthesis of Vitamin D