Sending Signals

Sending Signals

Neurons send signals by releasing chemical neurotransmitters across a synapse, the space between neurons. The axon terminal releases the neurotransmitter, which moves across the synapse and attaches to receptors on the dendrites of a nearby neuron. This generates an electrical signal that goes to the neuron's cell body. If enough input signals are received, the cell body produces an electrical signal called an action potential, which travels down the axon to an axon terminal. From the axon terminal, neurotransmitters are...
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River Watching

River Watching

From Rivers and Streams!

Observing things closely is an important part of being a scientist. In this activity, you’ll watch a river to see what you can notice about it.

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Be a Wetland Detective

Be a Wetland Detective

From Marshes and Swamps!

Is there some kind of wetland near your home? Do you live near a river or lake? Or next to the ocean? Ask an adult to help you identify a local wetland to explore.

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Ocean Journal

Ocean Journal

From Oceans and Seas!

Captain James Cook (1728–1779) was a famous British explorer. On his journey to the Arctic Ocean, he kept a journal and recorded his observations about Arctic ice. Today, scientists use Captain Cook’s notes to understand how sea ice in the Arctic is changing. You, too, can record your observations in a science journal. Who will read about your discoveries in the future?

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Lake-Top Living

Lake-Top Living

From Lakes and Ponds!

What happens when a lake grows and shrinks according to the season? How do people live and work on a lake that’s always moving its shores? Residents on Tonlé Sap in Cambodia solved this problem by building a floating village. Imagine you are building a brand new floating village. What do you think would be good building materials? Use the scientific method to think about different ways to make a cardboard structure float.

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