*Blood flow is regulated in all three types of blood vessels through constriction and dilation.
*Contraction of blood vessels slows blood flow, while relaxation of blood vessels, or dilation, allows free flow of blood.
*Muscle fibers control the constriction and dilation of vessels. In the capillaries, rings of muscle called capillary sphincters control blood flow.
*The directional flow of blood in the veins is controlled with valves , which prevent backward blood flow when closed, and allow blood to flow only toward the heart when open.
Vasoconstriction and vasodilatation allow blood vessels (arteries and veins) to control blood flow and thus control the blood pressure. This is possible because of the smooth muscle cells that surround the vessels. The contraction and dilatation of those muscles is controlled by chemical signals (e.g. norepinephrine constricts the vessels, while NO dilates them).
The correct medical condition is called orthostatic hypotension; also, called postural hypotension where one can feel dizzy, lightheaded or sometimes faint. This is a form of low blood pressure that happens when a patient get up from lying down or sitting up. Moreover, the common cause of this is lengthy bed rest and dehydration.
They get it from eating sugary foods and they need it for energy
Answer: A neutron is actually a subatomic particle that can be found in the nucleus of every atom except that of simple hydrogen and... I wasn't sure about the three parts for a neutron but for an atom is : protons, neutron, and electrons.
Explanation:
What would most likely reduce the bias present in Elias' experimental design would be to not ask just the members of his high school team to be the subjects because they represent a very specific group of people. It would be much better to use a random group of people and have them do the same thing.
