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Measurement of Blood Pressure01:17

Measurement of Blood Pressure

Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a stethoscope.
Anatomy of the Circulatory System02:03

Anatomy of the Circulatory System

The human circulatory system consists of blood, blood vessels that carry blood away from the heart, around the body, and back to the heart, and the heart itself, which acts as a central pump. The systemic circuit supplies blood to the whole body, the coronary circuit supplies blood to the heart, and the pulmonary circuit supplies blood flow between the heart and lungs.
Neural Regulation of Blood Pressure01:18

Neural Regulation of Blood Pressure

The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
Baroreceptor Reflex
Baroreceptors, located in the carotid sinuses and aortic arch, detect changes in blood pressure. When blood pressure rises, these stretch-sensitive receptors...
Blood Pressure01:24

Blood Pressure

The movement of blood in a human body, commonly referred to as blood flow, is determined by the volume of blood that traverses a certain section of the bodily system per unit time. It is the rhythmic contraction of the heart's ventricles that primarily instigates this movement. As the ventricles contract, blood is forced into the prominent arteries, which then flow from areas of greater pressure to lower pressure areas. This movement continues into smaller arteries and arterioles and...
Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Blood Pressure Imbalances and Circulatory Shock01:24

Blood Pressure Imbalances and Circulatory Shock

Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
Blood Pressure: Hypertension and Hypotension
Normal blood pressure is 120/80 mm Hg. Elevated blood pressure is 120-129/under 80 mm Hg. Hypertension, warranting treatment at 130/80 mm Hg, is often asymptomatic and can lead to severe cardiovascular events, aneurysms, peripheral arterial disease, chronic renal disease, or cardiac...

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Related Experiment Video

Updated: Jun 19, 2026

Measures of Heart and Ventilatory Rates in Freely Moving Crayfish
06:47

Measures of Heart and Ventilatory Rates in Freely Moving Crayfish

Published on: October 15, 2009

A STUDY OF THE CIRCULATION, BLOOD PRESSURE, AND RESPIRATION OF SHARKS.

E P Lyon1

  • 1Marine Biological Laboratory, Woods Hole, and the Department of Physiology, University of Minnesota, Minneapolis.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary

Sand sharks exhibit distinct branchial and systemic blood pressures, with the branchial pressure significantly higher. Their cardiovascular system shows resilience to trauma but can be influenced by stimuli, suggesting a vasomotor apparatus.

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Area of Science:

  • Ichthyology
  • Comparative Physiology
  • Cardiovascular Research

Background:

  • Understanding fish cardiovascular physiology is crucial for comprehending aquatic vertebrate adaptations.
  • Previous research has established baseline physiological parameters in various fish species, but specific details on elasmobranchs like sand sharks remain areas for further investigation.

Purpose of the Study:

  • To investigate the blood pressure dynamics in the branchial and systemic circulations of sand sharks.
  • To explore the influence of physiological stimuli (trauma, muscular effort, chemical agents, light) on sand shark blood pressure and heart rate.
  • To determine the relationship between heart rate and respiration rate in sand sharks and assess the role of the nervous system in cardiovascular regulation.

Main Methods:

  • Direct measurement of branchial and dorsal (systemic) blood pressure in sand sharks.
  • Observation of blood pressure and heart rate responses to experimental conditions including trauma, visceral manipulation, sodium carbonate injection, and light exposure.
  • Assessment of the effect of atropine on cardiac inhibition.
  • Correlation of heart rate with respiration rate under various conditions.

Main Results:

  • Average branchial blood pressure was 32 mm Hg (highest 43 mm Hg), and average systemic pressure was 23.3 mm Hg (highest 30 mm Hg), yielding a ratio of approximately 3:2.
  • Blood pressure remained stable under trauma but gradually decreased over hours under experimental manipulation; it increased with muscular effort and following cessation of struggling.
  • Adrenalin response mimicked mammalian patterns; spontaneous fluctuations and light-induced increases in blood pressure were observed, suggesting a vasomotor apparatus.
  • Heart rate generally matched respiration rate (average 24/min), with deviations showing slower heart rates often in simple ratios to respiration; cardiac inhibition by stimuli was atropine-reversible.

Conclusions:

  • Sand sharks possess a dual circulatory pressure system with higher pressure in the branchial circulation.
  • Their cardiovascular system exhibits regulatory mechanisms responsive to physiological and experimental stimuli, indicative of a functional vasomotor system.
  • The close coupling of heart rate and respiration, along with stimulus-induced cardiac inhibition, suggests significant neural control over the sand shark's cardiovascular function.