Hypercapnia A slight increase in PCO and thus H Stimulates central chemoreceptors Hypoxia Oxygen deficiency at the tissue level Caused by a low PO in arterial blood due to high ...

Chromosomes from a chicken were labelled with chromosome-specific fluorescent probes Each of the seven types of chicken chromosomes is coloured with a different dye In this fluorescent light micrograph each ...

The large, white flowers of giant saguaro cactus (Carnegiea gigantea) produce sweet nectar. The flowers are visited by bats at night, and by birds and insects during the day.

Checkpoint genes in action Radiation damaged the DNA inside this nucleus A Green dots pinpoint the location of the product of a gene called BP B red dots show the ...