HS-LS1-2
Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.
- Chemistry
Cool Jobs: Saliva offers a spitting image of our health
Scientists are using this secretion to study our body’s functions, to test for disease and even to diagnose injury.
- Brain
Explainer: What is a neuron?
From the moment you are born, cells called neurons sense information, process it and then pass it on. Neurons allow you to do everything that you do.
- Brain
Search for ‘rewards’ is big driver in remodeling a teen’s brain
Communication ‘highways’ in the brain undergo a major overhaul as children morph into adults. Dopamine plays a big role in this remodeling project.
- Brain
Scientists Say: Neuron
Neurons are the foundational cells in the nervous system. They pass along and process information using electrical signals.
- Health & Medicine
Teen depression linked to how the brain processes rewards
Depression in teens alters their brains’ pathways in ways that may put those kids at risk of lifelong mental-health problems — unless they get help.
- Health & Medicine
Space travel may harm health by damaging cells’ powerhouses
Biochemical changes after going to space suggest that harm to cells’ energy-producing structures, called mitochondria, could explain astronauts’ health issues.
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Scientists Say: Respiration
Breathe in and out, that’s respiration. Have a cell break down sugars for energy, and that’s respiration too.
- Brain
A taste map in the brain is a scattering of tiny flavor islands
Some senses are highly organized in the brain. Taste is not. And that points to just how important it is.
- Animals
Touching allows octopuses to pre-taste their food
Special sensory cells in their arms’ suckers sense chemicals. Those cells allow them to taste the difference between food and poison.
- Health & Medicine
Strongest bones come from Goldilocks recipe of exercise and rest
Building strong bones for life depends on adolescents staying active and getting enough sleep. Sometimes a lot of sleep, like 11 hours!
- Animals
Ogre-faced spiders listen closely to snatch bugs from the air
Ogre-faced spiders can hear prey sneaking around behind them. Low frequencies can trigger a blind, backwards attack.
- Animals
Please do not touch the Australian stinging tree
Stinging-tree leaves look soft and inviting, but one touch delivers agony. Structurally, the plant's painful chemical looks a lot like spider venom.
