The role of calcium in muscle contraction is A. To break the cross bridges as a cofactor in the hydrolysis of ATP B. To bind with troponin, changing its shape so that the actin filament is exposed C. To transmit the action potential across the neuromuscular junction D. To re-establish the polarization of the plasmas membrane following an action potential

What type of questions asked from the lesson of magnetic effect of electric current 

Wavelength of green light is

A) 400-450 nm

B) 500-550 nm

C) 660-720 nm

D) 720-800 nm

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?

What are the main components of our environment? Explain each of them briefly.

What are examples of hydrotropism plants?