[\'Dr Ahmed Sayed Khashaba, Associate Professor of Medical Physiology, Department of Basic Sciences, Riyadh Elm University, Riyadh 12734, Kingdom of Saudi Arabia; E mail: ahmedkhashaba@riyadh.edu.sa.\']
Students\' Perceptions towards the Experience, Quality, Challenges and Effectiveness of Online Teaching-Learning during Covid-19 Pandemic in Riyadh Elm University, Saudi Arabia.