Ch. 1 Introduction

Levels of Organization in order (Basic → complicated)

Subatomic Particles → Atom → Molecules → Macromolecule → organelle → Cell → Tissue → Organ → Organ System → Organism

Growth

Increase in cell number and size and increase in body size

Reproduction

Production of new cells and organisms

Responsiveness

Reaction to a change inside or outside of the body

Movement

Change in body position or location: motion of internal organs

Metabolism

the sum of all chemical reactions in a living system: energy production and nutrient cycling

Respiration

Making energy. Most organisms do it by taking in oxygen and giving off carbon dioxide

Digestion

Breaking down food into usable nutrients for absorption into the blood

Circulation

Moving chemicals and cells through the body fluids

Excretion

removing waste products

Homeostatic Mechanisms

Self-regulating systems that monitor aspects of the internal environment and correct them as needed

3 parts pf a homeostatic mechanism

Receptor(detects and informs), Control center(decision making), and effector(muscle or gland that responds)