Skip navigation

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Results 1 - 5 of 5 for Close out
  1. ... pass through into the lungs. Then the epiglottis closes off the windpipe, and simultaneously, the abdominal and ...
  2. ... share a membrane with the capillaries. That's how close they are. This lets oxygen and carbon dioxide ...
  3. ... to small veins, or venules. Lymph capillaries lie close to the blood capillaries, but they are not ...
  4. ... or danger. Let's examine an individual neuron up close. Here is a peripheral nerve. Each one of ...
  5. ... it's difficult to see things that are up close. Glasses with convex lenses narrow the plain of ...