Science news articles about 'muscular movement'

... that even very young, neural-tube-stage embryos, before developing gills, blood, or the ability for muscular movement, kept their developing head in the oxygen sweet spot. "Once we started with the ...

Red-eyed treefrog embryos react to environmental oxygen concentration before they have blood or muscular movement. These initial responses to the environment may be critical to the frogs' long-term ...