Daphnia magna Heart Rate Study

In this video, biologist Zahra Ghacemi demonstrates how to determine the normal heart rate of Daphnia magna, a small crustacean. The video explains the characteristics of Daphnia, including its transparent body, and guides viewers through observing it under a microscope. Instructions are provided for measuring and calculating the heart rate in beats per minute. Viewers are encouraged to participate by counting heartbeats and calculating the average heart rate. The video concludes with a summary and encouragement to complete a data sheet.

What type of organism is Daphnia magna?

• A freshwater plant

• A water flea

• A type of algae

• A type of fish

Where does Daphnia magna typically live?

• In the ocean

• In freshwater lakes

• In deserts

• In saltwater marshes

Why is Daphnia magna chosen for observation under a microscope?

• It is very large

• It is easy to catch

• It has a colorful body

• It has a transparent body

What is the location of the heart in Daphnia magna?

• In the middle of its body

• At the front of its body

• Near its antennae

• At the back of its body

How do you calculate the heartbeats per minute of Daphnia?

• Count for 30 seconds and multiply by 2

• Count for 15 seconds and multiply by 4

• Count for 10 seconds and multiply by 6

• Count for 1 minute directly

If you count 20 heartbeats in 15 seconds, what is the heart rate per minute?

• 40 bpm

• 100 bpm

• 60 bpm

• 80 bpm

What should you do after counting the heart rate twice more?

• Change the water

• Stop the experiment

• Calculate the average heart rate per minute

• Add more Daphnia

What is the purpose of watching the video again?

• To add more water

• To adjust the microscope

• To change the Daphnia

• To count the heart rate two more times