Menstruation? Idk if that is right, but it sounds like someone started their period.
Not the way it looks here.
But if there's a plus or a minus sign, or even a fraction bar, in that space before the '5', then it sure is.
Your muscles. Some muscles are “voluntary.” They
are the ones you control, the ones that let you exercise—or
relax. Some muscles are “involuntary.” They just do their
job with no effort on your part—like your heart muscles.
Withdrawal!
hope this helps!
Answer:With this system, blood always flows in only one direction inside the heart. There are also valves at the bottom of the large arteries that carry blood away from the heart: the aorta and the pulmonary artery. These valves keep the blood from flowing backward into the heart once it has been pumped out.
Explanation:
