Concept 49.1  Sensory receptors transduce stimulus energy and transmit signals to the central nervous system	49.01
 Concept 49.2  The mechanoreceptors involved with hearing and equilibrium detect settling particles or moving fluid	49.02
 Concept 49.3  The senses of taste and smell are closely related in most animals	49.03
 Concept 49.4  Similar mechanisms underlie vision throughout the animal kingdom	49.04
 Concept 49.5  Animal skeletons function in support, protection, and movement	49.05
 Concept 49.6  Muscles move skeletal parts by contracting	49.06
 Concept 49.7  Locomotion requires energy to overcome friction and gravity	49.07
Activity: Structure and Function of the Eye	49&A
Activity: Human Skeleton	49&B
Activity: Skeletal Muscle Structure	49&C
Activity: Muscle Contraction	49&D
Investigation: How Do Electrical Stimuli Affect Muscle Contraction?	49&A
Video: C. elegans	CElegansCrawl-V.html=CElegansCrawl-V.swf
Video: Clownfish and Anemone	ClownfishAnemone-V.html=ClownfishAnemone-V.swf
Video: Coral Reef	CoralReef-V.html=CoralReef-V.swf
Video: Earthworm Locomotion	EarthwormLocomot-V.html=EarthwormLocomot-V.swf
Video: Echinoderm Tube Feet	EchinodermTubeFeet-V.html=EchinodermTubeFeet-V.swf
Video: Flapping Geese	FlappingGeese-V.html=FlappingGeese-V.swf
Video: Gibbons Brachiating	GibbonBrachiating-V.html=GibbonBrachiating-V.swf
Video: Jelly Swimming	JellySwimming-V.html=JellySwimming-V.swf
Video: Manta Ray	MantaRay-V.html=MantaRay-V.swf
Video: Soaring Hawk	SoaringHawk-V.html=SoaringHawk-V.swf
Video: Swans Taking Flight	SwansTakeFlight-V.html=SwansTakeFlight-V.swf
Video: Thimble Jellies	ThimbleJellies-V.html=ThimbleJellies-V.swf