Blood pressure - blood vessels, Biology

Blood Pressure - Blood Vessels

We are all familiar with the term high blood pressure. What exactly is blood pressure? By blood pressure we mean arterial blood pressure. During a heartbeat cycle the maximum pressure is referred to as systolic pressure and the minimum diastolic pressure. The difference between the two is the pulse pressure. Blood pressure is generally expressed in millimetres of mercury and as systolic/diastolic, that is 120/80 mm Hg.

2040_Blood Pressure - Blood Vessels.png

Figure:  Change in blood pressure in different parts of the circulation. The major drop occurs in the arterioles

Blood is 12.9 times less dense than mercury so a blood pressure of 120 mm Hg is equal to 120 x 12.9 = 1550 mm or 155 cm of blood. In other words if the blood vessel was to be opened suddenly the blood would squirt out to a maximum height of 155 cm above the cut. Pressure generated by the heart decreases due to the flow of blood. Figure shows blood pressures in the circulatory system of man. The blood pressure falls as blood flows from the aorta to the vena cava. The greatest pressure drop takes place in the smallest arterioles which by changing their diameter can regulate the flow of blood to various body organs.

Posted Date: 1/15/2013 11:51:56 PM | Location : United States







Related Discussions:- Blood pressure - blood vessels, Assignment Help, Ask Question on Blood pressure - blood vessels, Get Answer, Expert's Help, Blood pressure - blood vessels Discussions

Write discussion on Blood pressure - blood vessels
Your posts are moderated
Related Questions
Animal and Plant Cells The internal structural organisation and information related with hereditary characters and metabolic pathways are similar in all eucaryotic cells whethe

Hormone s . Cortical steroids (corticoids-hormones of adrenal cortex) are grouped into three catagories : mineralocorticoids, glucocorticoids and gonadocorticoids. (i) Mine

Coelenterata – General characters and classification.

Hi. I would like to know the type of instrument used to analyse the nerve system and how it functions.

Colibacillosis Colibacillosis is caused by different strains of Escherichia coli. The disease mainly affects children and travelers. Organisms grow in gut and produce toxin. It ma

Q. According to the function of the transmitted neural impulse which are the types of neurons? How different are the concepts of afference and efference of the neural impulse trans

What are the main biological functions in which chlorine ions participate? Like sodium cations, chlorine anions actively participate in the regulation of the osmolarity of tiss

Define the genetic growth pattern of infant? It takes 1-3 years for an infant to establish his own genetic growth pattern. Once this figure is established (such as height-for-a

How does aggregation occur in sickle-cell anemia? Place the steps in the correct order from no aggregation to sickle red blood cell. Note that deoxyhemoglobin is generally in the T

What is root cap? Root cap is a protective structure located in the tip of the growing root. It defends the meristematic tissue of the root forming a cap that surrounds the tip