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The heart is the only organ containing cardiac muscle
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What is the rhythmicity center of the brain?
Medulla Oblongata
What has the author Kenneth Clarke Fisher written?
Kenneth Clarke Fisher has written: 'Heart rhythmicity of embryo fish. 1. The effect of temperature on te hear rate of trout embryos'
How can the word circadian be used in a sentence?
working on my circadian rhythmicity
The rhythmicity center a sort of pacemaker that sets the rhythm of automatic breathing is located in the?
medulla oblongata, in the brain stem.
What has the author Christopher John McCabe written?
Christopher John McCabe has written: 'Genetic aspects of rhythmicity in Drosophila melanogaster'
What is rhythmicity?
a pacemaker that initiated each contraction of a heart beat "Autorhythmic cells: cardiac or smooth muscle fibers that are self-excitable; act as the heart's pacemaker and conduct the pacing impulse through the conduction system of the heart; self-excitable neurons in central nervous system,as in the inspiratory area of the brain stem." -Principles of Anotomy and physiology, TORTORA, DERRICKSON, 11th edition, Wiley & sons, Inc. (c) 2006 by bio. Sci. textbooks, Inc. and Bryan Derrickson
What are the Seven special properties of cardiac muscle?
- rhythmicity : capability of rhythmic self-excitation therefore no need for external control -conductivity: conduction of action potential along specialised muscle cells. -excitability: ability of muscle fibers to get exited . -contractility; ability of cardiac muscle to contract . It also has a long refractory period meaning it cant tetanus
What is auto-rhythmicity?
Autorhythmicity is the tendency for the sinoatrial node of the heart to have a low threshold for depolarization leading to the heart contracting on a regular basis, i.e. in a regular rhythm, without external stimulus from the nervous system.
What characteristics of cardiac muscle contracts the heart as a unit?
Cardiac muscle cells, or cardiomyocytes, are interconnected by specialized structures called intercalated discs, which contain gap junctions that allow electrical signals to pass rapidly between cells. This electrical coupling enables the heart to contract as a synchronized unit, known as functional syncytium. Additionally, cardiac muscle is striated and has intrinsic rhythmicity due to pacemaker cells, which initiate contractions and help maintain a consistent heartbeat. These characteristics ensure efficient and coordinated heart contractions to pump blood effectively.
How is rhythmicity of breathing set?
The rhythmicity of breathing is primarily controlled by the brainstem, particularly the medulla oblongata and pons. Neurons in these areas generate rhythmic patterns of activity that regulate the contraction of respiratory muscles. Additionally, sensory input from chemoreceptors and mechanoreceptors helps modulate the rhythm based on the body’s metabolic needs, such as changes in carbon dioxide and oxygen levels. This complex interplay ensures that breathing remains automatic yet adaptable to various physiological demands.
Where is th respiratory rhythmicity center located?
there is a specific group of cells found in the medula (part of the brain stem) which regulate the rhythm of breathing, hence the name (of this cellular formation) the Medulary Rhythmicity Center.
What characteristic is specific to the pacemaker sites of the electrical conduction system?
The characteristic specific to the pacemaker sites of the electrical conduction system, such as the sinoatrial (SA) node, is their ability to generate spontaneous action potentials due to a unique set of ion channels. These specialized cells have a higher resting membrane potential and exhibit automaticity, allowing them to depolarize and initiate electrical impulses without external stimulation. This intrinsic rhythmicity is crucial for maintaining the heart's regular beating pattern.
