Sharing a quarter century of teaching, the Smarter Teacher blog will focus upon the Three C's: Think Critically - Communicate Clearly - Work Collaboratively.
The Three C's of education are the most important skills necessary for teachers to develop in the students entrusted to their care.
"The illiterate of the 21st century will not be those who cannot read and write, but those who cannot learn, unlearn and relearn." - Alvin Toffler -
To witness blood flow in arterioles, venules and capillaries, my students view the transparent tails of living goldfish under the microscope.
We use medium size feeder fish for this lab. Students create a bed of wet gause on half of a petri dish. Situating the goldfish with the tail off of the gause, students weigh down the goldfish with a wet blanket of gause. The goldfish tail is then flattened using a half piece of a microscope slide. The students will then view the tail of the goldfish under the microscope to view the blood flow through the circulatory system of the goldfish.
Students can distinguish between blood flow in arteries and veins. With a little patience and effective microscopy skills they can determine the heart rate of the fish by counting the pauses in the blood flow through the venules. Most importantly students can witness cell movement through the capillaries as single cells line up and flow through the capillaries for diffusion between the tissues.
Students took this video utilizing a Flip cam through the ocular of the microscope.
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