Cardiac output is the amount of blood pumped by the heart in one minute. Which of these will increase cardiac output? decreased blood volume

increased physical activity

decreased metabolic activity

increased resistance in blood vessels

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

During convection, less dense fluid rises and denser fluid sinks.

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient