Life Processes
Lipi Shorts
CBSE · Class 10 · Science
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Life Processes
Central idea
A sleeping dog looks like it's doing nothing at all, yet its body is running four maintenance jobs nonstop: pulling in fuel, converting that fuel to usable energy, moving supplies to every cell, and hauling waste back out. None of these jobs ever clock out, not during sleep, not during stillness, not for one second you're alive. This chapter is the maintenance manual.
Central idea
A dog asleep on a porch looks perfectly still, yet nobody would say it has stopped being alive; watch closely and its chest rises and falls with every breath.
The job that never clocks out
1/9
Every living thing needs a constant supply of both energy and raw material from outside itself, but there are really only two fundamentally different strategies for getting it.
Two ways to get fuel
1/12
The human alimentary canal is, structurally, just one long tube running from mouth to anus, yet different stretches of that same tube are so specialised that each one might as well be a separate organ.
One long tube, many different jobs
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Every organism, whatever else differs about how it lives, breaks down glucose using essentially the same first step: splitting the six-carbon glucose molecule into a smaller, three-carbon molecule called pyruvate, a process that happens in the cytoplasm and needs no oxygen at all.
Burning fuel two ways
1/4
The heart's real job is keeping two things apart
See it in a diagram
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