Answer:
QRS represents ventricular depolarization. This depolarization initiates ventricular contraction which closes the mitral and tricuspid valves. It is the closure that is heard as the first heart sound.
Explanation:
Answer:
Fish
Explanation:
Some types of fish contain high levels of mercury which can be harmful to the development process of the fetus.
Act as if the world was a piece of paper rolled up where each end touched the other. then just pull them so they form a 2-D map.
C. Thermesthesia
it is the sensitivity to temperature