Which of the following is a flap of tissue in the heart that prevents blood from flowing backwards?
atrium
pacemaker
septum
valve

the valve is a flap of tissue in the heart that prevents blood from flowing backwards. it is between ventricles and large blood vessels.

diabetes,smoking,high blood pressure,high cholesterol,obesity,inactivity

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.