Sphingosine itself can be phosphorylated to produce sphingosine-1-phosphate (S1P) inside cells. 

TLS Online TPP Program

#Id: 5660

#Unit 7. System Physiology – Animal

The upper scala vestibuli and the lower scala tympani contain perilymph and communicate with each other at the apex of the cochlea through a small opening called the helicotrema

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#Id: 182

#Unit 5. Developmental Biology

Epithelial-Mesenchymal Transition

An orderly series of events whereby epithelial cells are transformed into mesenchymal cells.

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#Id: 3984

#Unit 7. System Physiology – Animal

In cardiac muscle, the action potential is caused by opening of three types of channels

Voltage activated fast sodium channels 

L-type calcium channels (slow calcium channels or calcium-sodium channels)

Voltage activated potassium ion channels

TLS Online TPP Program

#Id: 10277

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 4646

#Unit 13. Methods in Biology

Diphenyltetrazolium bromide, a yellow tetrazole is reduced by metabolically active cells to form insoluble, purple formazan dye crystals detected at 570nm