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
Spermatophores Many non-chordates do not release free sperms during copulation. They have a mechanism to bundle and enclose a number of sperms in a sheath usually made of gela

Q. Are all pneumonias caused by bacteria? The Pneumonia is the generic name of inflammation of the lungs. Moreover bacterial pneumonias, there are pneumonias caused by fungi, v

Define Nutritional Availability - Microbial Survival and Growth? Food borne microbes are chemotrophs. Generally the types of microorganisms present on a particular food are the

Biology once said why this statement is logical in terms of kin selection and use the coefficient of relatedness he'd be willing to lay down his life to save two brothers or eight

Make a detailed study on phylum protozoa taking an example with clear labeled diagram

MUTATION THEORY (Hugo de Vries 1901) - New species are not formed by continuous variations but sudden appearance of variations i.e., mutation. Mutation are heritable and per

Ringworms (cutaneous mycoses) Cutaneous mycoses – also called dermatomycoses, occur worldwide and represent the most common fungal diseases in humans. The dermatophytes are th

How Gender affects the bmr? We have already emphasized earlier that sex difference in metabolic rates are primarily attributable to difference in body size and composition. Wom

Define Bioavailability of pyridoxine? A recent review by Gregory confirms that bioavailability of vitamin B 6 in a mixed  diet is about 7570, with approximately 8% of this tot

Determine about benefits of Jogging Jogging gives a sense of wellness to a diabetic patient. The frequency of jogging should be at least 3 days in week with a distance of 2 km