18. The Heart

Which of the following would increase cardiac output to the greatest extent?

Which part of the heart's electrical conduction system is responsible for initiating the heartbeat?

What change would lead to an increase in cardiac output during exercise?

Which electrolyte is most directly responsible for triggering cardiac muscle contraction by entering the cell and initiating calcium-induced calcium release?

Which method should a nurse use to assess a client for a pulse rate deficit?

Which feature is characteristic of an action potential at the SA node?