The qrs complex of an ecg corresponds
a. the depolarization of the atria.
b. the progressive wave of ventricular depolarization.
c. the repolarization of the ventricles.
d. atrial repolarization.
e. none of the answers are correct

What are the functions of the various parts of the neuron? how are messages transmitted through the nervous system? make sure that your response demonstrates that you understand how this works!

Why would one lymph node in the neck be swollen and not the other? what causes them to swell?

Asoccer mom is driving her 75 year old grandmother and her 9 year old daughter home after the game. the grandmother and daughter were both in the back seat and both were wearing their seat belts. a car ran a red light in front of them, causing them to t-bone that car on the passenger side. fortunately there were no serious injuries, but the grandmother did sustain several rib fractures. the mother, daughter and driver of the at-fault car were shaken up but unhurt. what are some possible reasons that the grandmother sustained rib fractures while the other victims did not?