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Doctor insights on: The Effects Of Strength Or Force In Skeletal Muscle Contractions

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How does control of the contraction of skeletal muscles to the cardiac muscles happen?

How does control of the contraction of skeletal muscles to the cardiac muscles happen?

Different: Cardiac muscle is different than skeletal muscle (arms, legs, back, etc). Skeletal muscle contracts when stimulated by the nerves that supply it. Heart muscle fires spontaneously as various electrolytes change concentration in the surrounding tissue. The area called the sinus node typically passes the threshold first thus firing the electrical impulse. This area is modulated by brain inputs. ...Read more

Muscle (Definition)

It is a body tissue that has the ability to contract. It shortens and generates force. It relaxes and returns to its original length. Muscles move joints, stabilize the body, move air and food through the organs, act as valves for bladder, bowel and other organs. They control movement of the eyes. They help us express ourselves by changing the shape of our ...Read more


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Involuntary muscle contractions of the urethra healthy or a problem?

Involuntary muscle contractions of the urethra healthy or a problem?

Necessary & healthy: You require involuntary contractions of the urethral sphincter muscles when you cough or sneeze to prevent expulsion of urine from the bladder, ie wetting. ...Read more

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How does immobility of the muscular and skeletal systems occur?

How does immobility of the muscular and skeletal systems occur?

Several ways.: Injury, disease (stroke), treatment (cast), severe mental illness like depression or catatonic states. What specifically do you want to know? ...Read more

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Little scoliosis can cause muscle spasms spread in the whole body? Or it affects only some group of muscles?

Little scoliosis can cause muscle spasms spread in the whole body?

Or it affects only some group of muscles?

Scoliosis: Scoliosis is usually not painful unless severe. Curves greater than 50 degrees most commonly cause pain. Your scoliosis may actually be a result of muscle spasm (sciatic scoliosis). If that is the case, treat the muscle spasm, and the scoliosis may disappear. Treatment of muscle spasms includes pt, stretching, heat/ice, otc meds. But if persistent, md evaluation will likely help to determine cause. ...Read more

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What is the difference between "contractility" and "force of contraction" of cardiac muscle?

What is the difference between "contractility" and "force of contraction" of cardiac muscle?

Very complicated: This gets pretty nuanced! Contractility is a concept that refers to the inherent ability for heart muscle cells or the heart in general to develop a certain amount of force for the same given amount of stretch (preload) and load (afterload). Force of contraction is how hard the muscle or the heart is contracting no matter what the loading conditions are. ...Read more

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What is the difference between contractility and force of contraction of cardiac muscle?

What is the difference between contractility and force of contraction of cardiac muscle?

Contractility: Contractility is the property of how much the heart muscle can contract. Force of contraction is the actual force generated by the result of the contractility property. ...Read more

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Does working out increase the size or the amount of muscle fibers? Also, is there a way to increase the actual number of fast twitch muscle fibers?

Does working out increase the size or the amount of muscle fibers? Also, is there a way to increase the actual number of fast twitch muscle fibers?

Muscle strengthening: We are born with fixed amount if muscle. Exercise increases the fiber size, but does. It add more fibers per se. Focused strengthening will reduce fat in muscle and improve the efficiency of contractions. I question if the fiber mix will change but there will significant improvement in performance like,this, so result will be the same. PT or exercise trainers can assist here. ...Read more

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Can deterioration of the knee cartilage affect the whole leg? ( by way of muscle strain, cramps, or weakness when stepping)

Can deterioration of the knee cartilage affect the whole leg? ( by way of muscle strain, cramps, or weakness when stepping)

Very Good Chance!: If your knee cartilage is damaged, your knee will not function correctly. Most folks will favor the other knee, or alter their body mechanics to compensate. This may with time lead to dysfunction in other areas. Your body can also involuntarily stop firing muscle groups to try to protect the injured knee. A good physical therapy program or home exercises may be an option if early enough. ...Read more

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Which has the potential to increase bone mass density the most, strength training (1-5 reps) or hypertrophy (8-12 reps). I use a pair of dumbbells?

Which has the potential to increase bone mass density the most, strength training (1-5 reps) or hypertrophy (8-12 reps). I use a pair of dumbbells?

Weight bearing: Weight bearing exercise, such as walking, is the best form of exercise to increase bone mass density. Strength training and hypertrophic exercises can increase muscle strength and size, respectively, and may be somewhat helpful for increasing bone mass density, but the exercise method of choice is weight bearing. Carrying weight while walking can increase benefit. ...Read more

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What is the biomechanics of muscle contraction types while doin push-ups?

What is the biomechanics of muscle contraction types while doin push-ups?

EccentricConcentric: When you lower your body to the floor, this is considered an eccentric exercise, where you're applying the load and lengthening the musculotendonous unit as you go down further. When you push away from the floor, this is considered a concentric exercise, as you shorten the musculotendonous unit as the load is applied. ...Read more

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What would happen in the blood as a result of an increased contraction rate of the diaphragm and rib cage muscles?

What would happen in the blood as a result of an increased contraction rate of the diaphragm and rib cage muscles?

This would be hyperv: -entilation, ,it would result in lower CO2, which leads 2 molecular exchanges that result in a person to loose consciousness. ...Read more

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What causes severe muscle cramping in various muscles in the absence of exercise?

What causes severe muscle cramping in various muscles  in the absence of exercise?

Cramping: It may be an electrolyte imbalance need to get some lab work it may also be related to some of the medications you are taking. ...Read more

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In dystonia are the muscles subjected to the involuntary contraction ever damaged from the involuntary contraction?

Bulk up: In all the dystonias i've seen, i can't think of one where the abnormal contraction itself caused muscle injury. Usually, the muscle bulks up due to repeated "exercise" from the dystonia. Over time there can be damage to adjacent joints. For example, torticollis can damage the neck joints over the years due to extra wear and tear. Dystoniascan cause the muscle to hurt, but not damage. ...Read more

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If serotonin induced muscular rigidity causes the muscles to contract then are the blood vessels in those muscles also forced to contract?

If serotonin induced muscular rigidity causes the muscles to contract then are the blood vessels in those muscles also forced to contract?

Serotonin : Serotonin induced muscular rigidity is a syndrome that must be recognized and treated by your primary care physician. If you are having these symptoms consult one as soon as possible. ...Read more

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What causes involuntary muscle contractions?

What causes involuntary muscle contractions?

Various Reasons: This could be due to an electrolyte imbalance like low calcium or potassium. It could also be due to stress or anxiety. Could also be from caffeine, medication, exercise or lack of exercise. ...Read more

Contraction (Definition)

This usually has to do with the onset of labor. It is a muscular tightening of the uterus. Contractions are timed from beginning to end of hardening of the uterus (duration) and from beginning of one contraction until the beginning of the next (frequency). A third descriptor is intensity or how hard ...Read more


Dr. Evan Altman
56 doctors shared insights

Muscle Contractions (Definition)

When a muscle contracts, it basically shortens. In a skeletal muscle, the shortening of the muscles then pulls on a tendon causing motion to occur ...Read more