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What does stretching a myocardial cell cause the cell to do?
Stretching a myocardial cell allows more Ca+2 into the cell and increases the force of contraction (the longer the muscle fiber when it begins to contract, the greater the force of contraction).
Myocardial cells can generate action potentials spontaneously because they have?
Myocardial cells can generate action potentials spontaneously due to the presence of funny (If) channels that allow for a slow influx of sodium ions, as well as T-type calcium channels that contribute to the depolarization phase of the action potential. These channels, coupled with the unique organization of ion channels in the myocardial cell membrane, enable automaticity in these cells.
What is cell injury and cell death?
Cell injury refers to any damage or disruption to a cell's structure or function caused by various insults. Cell death is the irreversible cessation of cellular activities and functions, leading to the demise of the cell. Cell death can occur through different mechanisms, including apoptosis and necrosis.
What does Nature of injury mean?
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How long does it take for myocardial cells to regenerate?
Myocardial cells, or cardiomyocytes, have a very limited capacity to regenerate after injury, such as a heart attack. Research indicates that the turnover rate of these cells is quite slow, with estimates suggesting that only about 1% of cardiomyocytes are replaced each year in healthy adults. Factors like age and heart disease can further decrease this regeneration capacity. Overall, significant healing and regeneration of myocardial cells can take years and is often insufficient to restore full function after substantial damage.
What are the two cell populations in the body that do not undergo cell division?
Neurones in the CNS and cardiac/myocardial cells.
What describes when the myocardial cells recovers electrically?
The process by which myocardial cells recover electrically after depolarization is called repolarization. During repolarization, the cell's membrane potential returns to its resting state as potassium ions exit the cell. This phase prepares the myocardial cells for the next electrical impulse.
What does the prefix myo mean in myocardial?
The prefix "myo" in myocardial refers to muscle, specifically in relation to the muscles of the heart.
What ion is released within the myocardial cell with the depolarization and acts on the contractile proteins causing the cell to contract?
myosin?
What does myocardial mean?
It means "something" to do with the heart's muscle.
What does stretching a myocardial cell cause the cell to do?
Stretching a myocardial cell allows more Ca+2 into the cell and increases the force of contraction (the longer the muscle fiber when it begins to contract, the greater the force of contraction).
Is a injury to the cell that can not be stopped called Irreversible injury?
Yes, an injury to a cell that cannot be stopped or recovered from is typically considered irreversible. This type of injury often results in cell death and permanent damage to tissue or organs.
What has the author Ian Clark Wilson written?
Ian Clark Wilson has written: 'The role of leucocytes in neonatal myocardial ischaemia-reperfusion injury'
What is the thin filament of the myocardial cell?
The thin filament of a myocardial cell is composed primarily of actin, tropomyosin, and troponin proteins. These proteins play a crucial role in regulating the contraction and relaxation of the heart muscle by interacting with the thick filament during the process of muscle contraction.
What does the medical abbreviation AMI mean?
AMI means Acute Myocardial Infarction
What does the abbreviations STEM and non STEM mean in connection with ST segment?
I believe you are referring to STEMI (ST segment elevation myocardial infarction) and non-STEMI. These are two different forms of myocardial infarction - STEMI results in transmural (all the way through the cardiac muscle wall) injury, which results in elevation of the ST segment on EKG. Non-STEMI (NSTEMI), which used to be called a Non-Q-wave MI, is usually a subendocardial injury, which results in cardiac injury, but not as severe as STEMI. NSTEMIs do not have any elevation of the ST segment on EKG. These only have elevation of cardiac biomarkers on blood work.
What is a heart attack known as?
Acute Myocardial Infarction (AMI).
