When a patient is moderately dehydrated, what happens to following (increase, de
ID: 168244 • Letter: W
Question
When a patient is moderately dehydrated, what happens to following (increase, decrease, or no change) and why?A. Blood volume B. Blood pressure C. End diastolic volume D. End systolic volume E. stroke volume F. Force of contraction of the heart G. Heart rate H. Tissue perfusion I. Capillary diameter in the brain J. Cardiac output When a patient is moderately dehydrated, what happens to following (increase, decrease, or no change) and why?
A. Blood volume B. Blood pressure C. End diastolic volume D. End systolic volume E. stroke volume F. Force of contraction of the heart G. Heart rate H. Tissue perfusion I. Capillary diameter in the brain J. Cardiac output When a patient is moderately dehydrated, what happens to following (increase, decrease, or no change) and why?
A. Blood volume B. Blood pressure C. End diastolic volume D. End systolic volume E. stroke volume F. Force of contraction of the heart G. Heart rate H. Tissue perfusion I. Capillary diameter in the brain J. Cardiac output
Explanation / Answer
a.blood volume-decreases
b.blood pressure decreases
When dehydration is not given immediate and proper care,it may result in more complicated conditions such as hypovolemic shock which results from having low blood pressure.When the body is dehydrated,the blood volume decreases and its pressure against the artery walls is reduced.This causes a sudden drop in blood pressure and reduces the amount of oxygen reaching the body tissues,and when this condition is left untreated,hypovolemic shock can result to fatality.
Dehydration can also cause high blood pressure.This happens when our bodies are not getting sufficient amount of water and it then compensates by undergoing sodium retention-which is directly related to high blood pressure.If this is not given proper attention,the body will then close some capillary beds which cause increased blood pressure and raise the pressure on the arteries.
A reduced maximal cardiac output(i.e.,the highest pumping capacity of the heart that can be achieved during exercise) is the most physiologic mechanism whereby dehydration decreases a person’s VO2max and impairs work capacity in fatiguing exercise of an incremental nature.Dehydration causes a fall in plasma volume both at rest and during exercise,and a decreased blood volume increases blood thickness (viscosity),lowers central venous pressure,and reduces venous return of blood to the heart. During maximal exercise,these changes can decrease the filling of the heart during diastole(the phase of the cardiac cycle when the heart is relaxed and is filling with blood before the next contraction),hence,reducing stroke volume and cardiac output.Also,during exercise in the heat,the opening up of the skin blood vessels reduces the proportion of the cardiac output available to the working muscles.
capillary diameter in the brain increases due to decreasein cerebral water content.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.