In this colorful and interactive object, learners examine the structure and function of muscle and connective tissues. A quiz completes the activity.

In this screencast, learners examine the kinds of physical and chemical changes that occur in substances.

In this learning activity you'll review information on the neural synapse.

In this animated object, learners examine how gas volume varies directly with absolute temperature (K at constant pressure). An example of a sample of gas at two conditions of volume and temperature is used to illustrate the law.

In this animated object, learners examine processes that do not use ATP directly including hydrostatic pressure and facilitated diffusion with carrier proteins.

Learners quiz themselves on the conversion factors within and between the metric, apothecary, and household systems.

In this interactive object, learners identify charges on ions, write new formulas based on charge, and balance equations using coefficients.

In this screencast, learners categorize different metabolic activities as catabolic or anabolic and follow a glucose molecule through the processes of glycolysis, aerobic respiration, and fermentation.

Learners examine the location, structure, and function of the unipolar and multipolar neurons.

In this interactive object, learners identify the parts of an animal cell and its organelles.

In this colorful, interactive object, learners examine nervous and epithelial tissue composition and function. A quiz completes the activity.

In this screencast, learners examine the function and location of the motor neurons and the damage that can result when they are injured.

Learners examine how vapor pressure is calculated. The vapor pressure of a liquid increases with increasing temperature. If the heat of vaporization and the vapor pressure at one temperature are known, the vapor pressure at a second temperature can be calculated.

In this animated object, students are introduced to moles as a measurement.

Learners examine the meaning of oxidation, reduction, and half-reaction, and watch a film showing the deposition of copper metal from the reduction of copper (II) ion by aluminum. A brief quiz completes the activity.

In this animated and interactive object, learners examine the red blood cell's life cycle and function. A brief exercise completes the activity.

This animated object illustrates the events leading to the migration of phagocytes into areas of tissue damage and/or bacterial presence. Learners view bacterial cell phagocytosis, its subsequent enzymatic digestion, and exocytosis.

Learners read about lab equipment and basic safety measures. In a quiz, they view photos and determine if the lab technicians pictured are using safe practices.

In this animated and interactive object, learners examine the properties of liquids, solids, and gases.

Roman numerals are used to identify the charges on metal cations having multiple oxidation states. Five examples are provided for practice.

In this animated and interactive object, learners follow two rules to write unit conversion fractions.

In this screencast, learners examine the steps of carbohydrate digestion.

Learners examine what defines a fungus and read how fungi differ from animals and plants.

Learners review a graphic summary of the three series of reactions that occur during cellular respiration and the net energy (ATP) yield of that process.

Learners convert units used to designate pressure. Units for pressure are atm, mm Hg, torr, and pascal.