the blood leaving the heart is at high pressure,while that returning to the heart is at low pressure,why?.?

Answer 1

The simple reason is that unless there IS a pressure difference between the outlet of a pump (and a heart is really just a pump), and its (return) inlet,- blood wouldn't flow round the pressurized loop that the vascular system comprises... would it?

The heart, -with its pumping action, creates a high pressure at each beat, and ejects it into the aorta, from where it flows down the arterial `tree', because of the pressure gradient, just as water flows down a stream because the lie of the land making gravity act upon it, causes it to flow down to the lowest point.

The pressure of the blood is reduced more and more due to absorption of the pressure by the elastic balloon-like tubes through which it is passing, and also by friction and viscosity.

Eventually it possesses virtually no pressure over and above atmospheric, because it's all been spent, and at that point it returns to the heart via the vena cava, to be re-oxygenated and compressed and re-rejected.

Answer 2

You should read "The Blood Pressure Solution" (also available in electronic format, watch the video presentation here: http://www.fixbloodpressure.com ) It's a very comprehensive step-by-step book that walks you through the natural remedies of high blood pressure. It provides you with a lot of information on what foods to eat, how you can acquire and prepare these foods, how you can change your lifestyle for the better, how to eliminate the toxins from your body, how to reduce stress, how you can check your blood pressure level the correct way etc.

The book is amazing in that it not only lowers your blood pressure without the help of medications; it also aids you in having a life that is healthy, happier, and less stressful. This book chanced my life.

Answer 3

Blood pressure (strictly speaking: vascular pressure) refers to the force exerted by circulating blood on the walls of blood vessels, and constitutes one of the principal vital signs. The pressure of the circulating blood decreases as blood moves through arteries, arterioles, capillaries, and veins; the term blood pressure generally refers to arterial pressure, i.e., the pressure in the larger arteries, arteries being the blood vessels which take blood away from the heart. The pulse pressure (systolic minus distolic pressures) is almost nil when the blood reaches capillaries.
When the chest expands a negative pressure is created in the chest cavity. This helps the blood to return to the heart through the veins. Venous pressure is the vascular pressure in a vein or in the atria of the heart. It is much less than arterial pressure, with common values of 5 mmHg (0.7 kPa) in the right atrium and 8 mmHg (1 kPa) in the left atrium.

Answer 4

The systolic pressure (top number) is the blood pressure with contraction of the heart to push the blood out to the body and lungs. It's higher because the heart is squeezing. The diastolic pressure (bottom number) is the blood pressure with relaxation of the heart to fill it in preparation for systole again!

Answer 5

I like what you are attempting to say here but I can't go along with the analogy. The Holy Spirit enters our bodies not the soul of believers. And He doesn't course through us as blood through our veins. I see it more like the Holy Spirit taking up residency within a house (or temple which we are) and setting up housekeeping. The more we allow Him to do His job the better we are for it. The cleaner He makes us the better we represent the Landlord which will make us more desireable to others. Sometimes analogies help and sometimes they hinder. A lot of people when witnessing will ask another, "Would you like to invite Jesus into your heart." This will even make young children ask ... Will He fit? and adults ... Is this person whacked out? In some cases I've seen children frightened by the prospect of Jesus trying to get in their heart. I think we need to really consider the connotation of how any anaolgy we use will affect the hearer.

Answer 6

because of hypotension or LOW blood pressure


What is low blood pressure?

Blood pressure is the force exerted by circulating blood on the walls of blood vessels, and constitutes one of the principal vital signs. Blood pressure is generated by the heart pumping blood into the arteries and is regulated by the response by the arteries to the flow of blood.

By convention, an individual's blood pressure is expressed as systolic/diastolic blood pressure, for example, 120/80.The systolic blood pressure (the top number) represents the pressure in the arteries as the muscle of the heart contracts and pumps blood into them. The diastolic blood pressure (the bottom number) represents the pressure in the arteries as the muscle of the heart relaxes after it contracts. Blood pressure always is higher when the heart is pumping than when it is relaxing.

Systolic blood pressure for most healthy adults falls between 90 and 120 millimeters of mercury (mm Hg). Normal diastolic blood pressure falls between 60 and 80 mm Hg. Current guidelines define normal blood pressure as lower than 120/80. Blood pressures over 130/80 are considered high. High blood pressure increases the risk of developing heart disease, kidney disease, hardening of the arteries (atherosclerosis or arteriosclerosis), eye damage, and stroke.

Low blood pressure (hypotension) is pressure that is so low that it causes symptoms or signs due to the low flow of blood through the arteries and veins. When the flow of blood is too low to deliver enough oxygen and nutrients to vital organs such as the brain, heart, and kidney, the organs do not function normally and may be permanently damaged.

Unlike high blood pressure, low blood pressure is defined primarily by signs and symptoms of low blood flow not by a specific blood pressure number. Some individuals may have a blood pressure of 90/50 with no symptoms of low blood pressure and therefore do not have low blood pressure. However, others who normally have high blood pressure may develop symptoms of low blood pressure if their blood pressure drops to 100/60.

Answer 7

1

Answer 8

That's the way hydraulics works.