Define Systemic Vascular Resistance and list its determinants. Briefly explain the role of its determinants.
Systemic Vascular Resistance (SVR), also termed Total Peripheral Resistance (TPR), is the resistance encountered by blood as it flows through systemic vessels, excluding pulmonary circulation. It is a major determinant of arterial pressure.
Key Determinants:
Vessel Radius: The most critical factor, since resistance is inversely proportional to the fourth power of radius. Vasoconstriction in arterioles markedly elevates SVR, while vasodilation reduces it.
Vessel Length: Greater length increases resistance, though individual vessel length is constant; the vascular network contributes overall.
Blood Viscosity: Thicker blood, as in polycythemia, raises SVR, whereas lower viscosity, as in anemia, reduces it.
Answered By:
Sakshi Negi
Sakshi Negi is a Delhi-based journalist and content specialist with expertise in educational content and digital media, focusing particularly on government exam preparation and career guidance. With a degree in Journalism and Mass Communication from NRAI School of Mass Communication and her background as a Kendriya Vidyalaya alumna, she brings unique insights into the Indian education system and government sector opportunities.
Similar Questions
Classify jaundice according to its aetiology. Make a tabular representation of the blood, urinary and stool findings observed in different types ofjaundice.
Describe the formation, course and branches of ulnar nerve. Which muscles do each of the branches supply? Why is ulnar nerve called the "musician's nerve"?
Name the nerves and their branches that supply the sole of the foot stating the specific area of their distribution. Explain in brief what is Morton's metatarsalgia.
With the help of a suitable diagram, explain the innervation and functions of muscle spindle.
Describe the process of generation and conduction of nerve impulses in humans. Add a note on saltatory conduction.
Using a well labelled diagram, trace the taste pathway from circumvallate papillae of tongue to the cerebral cortex.
Enumerate any five tests for the assessment of renal tubular functions. Explain the underlying principle and their interpretation.
Explain the role of biotin in intermediary metabolism with suitable examples. Add a note on the mechanism of action of any biotin-antagonist with its application in medicine.
Define cardiac output and describe the regulation of cardiac output in normal adults. Add a note on Cardiac Index and Cardiac Reserve.
Describe Selenium under the headings of 'its dietary sources', 'its biochemical roles' and 'its deficiency diseases' with their clinical manifestations.
Important Questions from Miscellaneous
Write a note in 150 words
Mendelian and non-Mendelian traits.Write a note in 150 words
Theoretical significance of Purum kinship-system.Write a note in 150 words
Smell as a signal among non-human primates.Write a note in 150 words
Osteodontokeratik culture and its makers.Discuss the Miocene hominoid remains and their significance in evolution.
