© 2011 W. H. Freeman and Company CHAPTER 20 Introduction to Animal Physiology What Is Life? A Guide To Biology First Edition What Is Life? A Guide To Biology First Edition Jay Phelan

FIGURE 20-3 A negative feedback loop restores the internal environment to a set point.

FIGURE 20-4 Regulate or conform? Two strategies to cope with a changing environment.

FIGURE 20-5 Patching a tear.

FIGURE 20-8 How organisms acquire or dissipate heat.

FIGURE The nephron is the fundamental unit of the human kidney.

FIGURE From cells to organ systems.

FIGURE Tissues perform specific functions in the body.

FIGURE Connective tissues: the most abundant tissues in most animals.

FIGURE Muscle tissues are made up of elongated cells capable of generating force when they contract.

FIGURE Neuron and glial cells.