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Related Concept Videos

Pulse01:05

Pulse

The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls between...
Regulation of Pulse01:20

Regulation of Pulse

Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
Smooth Muscle Contraction01:25

Smooth Muscle Contraction

Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
The onset of contraction is triggered by an increase in calcium ions within the sarcoplasm, similar to the process in striated muscle. However, smooth muscles have a relatively smaller reservoir of the sarcoplasmic...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
Pulse01:16

Pulse

When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical indicator...
Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...

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Cardiac Catheterization in Mice to Measure the Pressure Volume Relationship: Investigating the Bowditch Effect
07:38

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Published on: June 14, 2015

Physiology: postprandial cardiac hypertrophy in pythons.

Johnnie B Andersen1, Bryan C Rourke, Vincent J Caiozzo

  • 1Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92697, USA.

Nature
|March 4, 2005
PubMed
Summary
This summary is machine-generated.

Carnivorous reptiles like Burmese pythons show rapid cardiac growth after meals. This study reveals a 40% increase in ventricular muscle mass, offering insights into cardiac hypertrophy mechanisms.

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Last Updated: May 11, 2026

Cardiac Catheterization in Mice to Measure the Pressure Volume Relationship: Investigating the Bowditch Effect
07:38

Cardiac Catheterization in Mice to Measure the Pressure Volume Relationship: Investigating the Bowditch Effect

Published on: June 14, 2015

Contractility Measurements on Isolated Papillary Muscles for the Investigation of Cardiac Inotropy in Mice
06:22

Contractility Measurements on Isolated Papillary Muscles for the Investigation of Cardiac Inotropy in Mice

Published on: September 17, 2015

Measuring Pressure Volume Loops in the Mouse
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Published on: May 2, 2016

Area of Science:

  • Physiology
  • Cardiovascular Biology
  • Comparative Anatomy

Background:

  • Carnivorous reptiles exhibit significantly increased oxygen consumption post-meal to meet metabolic demands.
  • This heightened metabolic activity imposes a substantial burden on the reptilian cardiovascular system.

Purpose of the Study:

  • To investigate the rapid cardiac adaptations in Burmese pythons following a large meal.
  • To explore the underlying molecular mechanisms driving cardiac muscle mass increase in response to feeding.

Main Methods:

  • Monitoring changes in ventricular muscle mass in Burmese pythons before and after feeding.
  • Analyzing gene expression patterns related to muscle-contractile proteins.

Main Results:

  • A remarkable 40% increase in ventricular muscle mass was observed within 48 hours post-feeding.
  • This cardiac hypertrophy is attributed to upregulated gene expression of muscle-contractile proteins.
  • The observed cardiac growth is a fully reversible physiological response.

Conclusions:

  • Burmese pythons demonstrate an exceptionally rapid and reversible cardiac hypertrophy following feeding.
  • This natural phenomenon in pythons serves as a valuable model for studying cardiac growth mechanisms.
  • Understanding these mechanisms could have implications for cardiovascular research in other species.