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What must be present for muscle contraction to occur?
- Multiple Fibre Summation Related to the central nervous system sending signals to contract muscles. - Frequency summation Related to when action potentials sent to muscles synchronously. Check the related links below for more information.
What are facts about heart attack?
1.5 million heart attacks occur in the United States each year. Women are more likely to die suddenly from a heart attack than men. Almost 50% of deaths from heart attack occur within one hour, outside a hospital.
When does muscle relaxation occur?
Muscle relaxation occurs when the muscle fibers stop contracting and return to their resting state after being stimulated.
Why do muscle cramps occur?
Muscle cramps occur due to involuntary contractions of muscles, often caused by dehydration, overuse, or mineral deficiencies like potassium or magnesium.
What causes a muscle cramp to occur?
A muscle cramp occurs when a muscle involuntarily contracts and does not relax. This can happen due to dehydration, muscle fatigue, lack of stretching, or mineral imbalances like low levels of potassium or calcium.
Where does a heart attack occur in the heart?
cardio muscle
When does wave summation occurs?
Wave summation occurs when a muscle is stimulated rapidly enough that it does not have time to completely relax between stimuli, causing the contractions to combine or "summate" to produce a stronger muscle contraction. This phenomenon can occur during repetitive or sustained muscle activity, leading to increased muscle force production.
What changes are thought to occur in the skeletal muscle to allow treppe to be observed?
This is known as wave summation. It is when the fibers of the muscles become stimulated before having a chance to relax completely.
What are murmurs?
Those which occur during relaxation of the heart between beats are called diastolic murmurs. Those which occur during contraction of the heart muscle are called systolic murmurs
Can dehydration cause heart cramps?
Yes, dehydration can lead to heart cramps, often referred to as muscle cramps or spasms in the heart area. When the body is dehydrated, electrolyte imbalances can occur, affecting muscle function, including the heart. Additionally, decreased blood volume due to dehydration can strain the heart, potentially leading to discomfort or cramping sensations. It is important to stay adequately hydrated to maintain proper heart function and overall health.
What are diastolic murmurs?
Those which occur during relaxation of the heart between beats are called diastolic murmurs. Those which occur during contraction of the heart muscle are called systolic murmurs
What is the pumping action of the heart called?
atrial and ventricular systole occur at the same time
Where does the electron transport chain of respiration occur?
This occurs in the muscle tissue of the walls of the heart.
Is heart arrhythmia a heart disease?
Is Heart Arrhythmia The Same As A Heart Attack?There not the same. A heart attack (also known as a myocardial infarction) is the death of heart muscle from the sudden blockage of a coronary artery by a blood clot. Coronary arteries are blood vessels that supply the heart muscle with blood and oxygen. Blockage of a coronary artery deprives the heart muscle of blood and oxygen, causing injury to the heart muscle. Injury to the heart muscle causes chest pain and pressure. If blood flow is not restored within 20 to 40 minutes, irreversible death of the heart muscle will begin to occur. Muscle continues to die for 6-8 hours at which time the heart attack usually is "complete." The dead heart muscle is replaced by scar tissue. The heart continues to function as the tissue dies. the heart can become arrhythmic if enough of the tissue dies, this can happen in a few minutes or a few days.A Heart arrhythmia is when the heart has already stop beating and had no pumping function.An dysrhythmia (incorrectly called an arrhythmia "a-" referring to no or not) is an irregular heartbeat. Heart rates can also be irregular. A normal heart rate is 50 to 100 beats per minute. Arrhythmia's and abnormal heart rates don't necessarily occur together. Arrhythmia can occur with a normal heart rate, or with heart rates that are slow (called bradycardia -- less than 60 beats per minute). dysrhythmia can also occur with rapid heart rates (called tachycardia -- faster than 100 beats per minute). In the United States more than 850,000 people are hospitalized for an dysrhythmia each year.
Do micro tears occur in the heart?
Yes, micro tears can occur in the heart, particularly in the context of certain conditions such as myocarditis, ischemic heart disease, or following intense physical exertion. These micro tears can affect the heart muscle's integrity and function, potentially leading to inflammation and further complications. However, the term "micro tears" is more commonly associated with skeletal muscle damage rather than cardiac tissue. Thus, while they can occur, the context and implications differ significantly from those in skeletal muscles.
What is the most common injury or sickness caused by diphtheria?
Myocarditis (inflammation of the heart muscle) and/or temporary paralysis. Death can occur in about 10% of cases.
How long can the heart muscle be deprived of adequate oxygen supply?
The heart muscle can only withstand a few minutes of inadequate oxygen supply before damage begins to occur. Prolonged deprivation of oxygen can rapidly lead to irreparable damage and cell death in the heart muscle, resulting in a heart attack. Immediate medical attention is crucial to restore blood flow and prevent long-term complications.
