Micrograph shows a blood smear. The neutrophil and eosinophil are similar in structure, but the eosinophil is larger. Both are filled with granular structures, and have three purple-stained nuclei. These white blood cells are surrounded with donut-shaped red blood cells.
Figure 33.1In this compound light micrograph purple-stained neutrophil (upper left) and eosinophil (lower right) are white blood cells that float among red blood cells in this blood smear. Neutrophils provide an early, rapid, and nonspecific defense against invading pathogens. Eosinophils play a variety of roles in the immune response. Red blood


Biomimetics is the design of engineering solutions guided by biological solutions to similar problems. Support materials in biological systems must be tough, flexible, and light. Engineers define a tough material as one that can absorb energy without fracturing. Flexibility is the ability to deform elastically but able to return to the original shape. Size of in both biological and designed system is often determined by many factors. Density of a material becomes

You discover an unusual new organism in the deep sea and are studying its skeletal system in a laboratory aquarium. The organism appears to have a radial body plan with a center fluid-filled cavity. If you remove fluid from its interior using a syringe, it seems to collapse somewhat. What kind of skeletal system does this organism likely have?
  1. exoskeleton
  2. hydrostatic skeleton or exoskeleton
  3. hydrostatic skeleton
  4. endoskeleton
You discover