The mode of fertilization in sea urchin being external, the egg and spermatozoa are released into the sea water.

TLS Online TPP Program

#Id: 4504

#Unit 13. Methods in Biology

When the positive terminal is on the left leg, the lead is known as the aVF lead.

TLS Online TPP Program

#Id: 4505

#Unit 13. Methods in Biology

Electroencephalography (EEG)

A method to record an electrogram of the spontaneous electrical activity of the brain.

TLS Online TPP Program

#Id: 4506

#Unit 13. Methods in Biology

EEG electrodes placed along the scalp (non-invasive) called scalp EEG.

TLS Online TPP Program

#Id: 4507

#Unit 13. Methods in Biology

Electrocorticography, involving surgical placement of electrodes, is sometimes called "intracranial EEG". 

TLS Online TPP Program

#Id: 4508

#Unit 13. Methods in Biology

EEG waves are not action potentials.

The EEG waves originate from alternating excitatory and inhibitory synaptic potentials that produce sufficient extracellular current flow across the cortex.

TLS Online TPP Program

#Id: 4509

#Unit 13. Methods in Biology

International 10–20 system

Internationally recognized method to describe and apply the location of scalp electrodes in EEG.