Since in the spleen blood flow is sluggish, the oxygen tension is low.

When red blood cells with hemogblobin S are exposed to this low oxygen tension they tend to aggregate and polymerize.

Progressively older embryos require a higher oxygen tension in the medium and, therefore, different gas mixtures are used for different stages of embryo.

These cells fail to return to normal shape when normal oxygen tension is restored.

Heme D is the site for oxygen reduction to water of many types of bacteria at low oxygen tension.

Pulmonary blood vessels within the lung are unique as they vasodilate to high oxygen tension and vasoconstrict when it falls.

The triggers for spore formation are not yet known, though oxygen tension and lack of nutrients may play roles.

Infected erythrocytes (Red Blood cells) tend to have lower oxygen tension, because it is significantly reduced by the parasite.

Decreased arterial oxygen tension is also likely to be evident.

Gravity, air pressure, oxygen tension, speed of light, all that was okay.