Hypovolemic shock is caused by severe blood and fluid loss, such as from traumatic bodily injury, which makes the heart unable to pump enough blood to the body, or severe anemia where there is not enough blood to carry oxygen through the body.Hypovolemic shock is caused when there isn't enough blood in your blood vessels to carry oxygen to your organs. This can be caused by severe blood loss, for example, from injuries. Your blood delivers oxygen and vital nutrients to your organs
That is correct- the heart pumps and the smooth muscles of arteries contract (also called constriction)
the pituitary gland is located at the base of the brain and produces hormones that allow different bodily functions to happen. for this question, your answer would be the last one.