Questions tagged [muscles]

The contractile tissue of animals derived from the mesodermal layer of embryonic germ cells.

Filter by
Sorted by
Tagged with
0
votes
1answer
90 views

Humans best at long distance running: purely physiological or is it a function also of ability to pace?

I have read that although certainly other land animals are much faster over short distances, a human can run down any other animal over time, so that if a human is hunting like a gazelle, etc. ...
0
votes
0answers
37 views

Is there a minimum amount a muscle can move? And thus, gaps in our movement?

Lately I've been thinking about something, based on my knowledge my chain of reasoning works like this... When you want to move a muscle your brain sends an electrical nervous impulse along the chain ...
0
votes
0answers
22 views

How fast can muscle fibers relax

I can find a great deal of information about how muscles contract, and how we divide them up into fast twitch and slow twitch and so forth. However, I can't seem to find anything on how fast a muscle ...
0
votes
0answers
55 views

Etymology of eccentric/concentric contractions

I was wondering if anyone knew why the terms eccentric and concentric were chosen to refer to lengthening and shortening muscle contractions? The basic etymology of the words are to do with ...
0
votes
1answer
92 views

How does use an action potential from innervation selectively modify tropomyosin over time?

Within a myofibril, the myofilaments move past one another to product muscle contraction if and only if the actin binding sites are exposed to the myosin by locally removing the tropomyosin by binding ...
0
votes
0answers
81 views

How can myoglobin be responsible for the red color of meat if it is located in the cytoplasm?

How can myoglobin be responsible for the red color of meat if it is located in the cytoplasm, as the visible part of muscle cells is the membrane (at least as I believe)? Sources: https://en....
0
votes
0answers
31 views

Under which circumstances does muscle hyperplasia happen in humans?

What circumstances allow humans to have muscle hyperplasia in the prenatal and immediately postnatal period that doesn't exist later? Is it about specific hormones that follow through our veins?
0
votes
0answers
406 views

What is the difference between muscle tension and muscle tightness?

Is there any difference between muscle tension and muscle tightness? I want to study the relation between forearm muscles tightness/tension and tendinopathy (specifically, medial and lateral ...
0
votes
1answer
721 views

Storage of energy in muscles vs fat depos [closed]

How does the body control, where consumed energy (fat, glucose) is stored? And what is its strategy? More specific: 1) How does the body control storing glucose in muscles and not as (subcutan) fat? (...
0
votes
1answer
45 views

Physical activity in fasted state: Glucose for brain vs muscles [closed]

Let's consider this scenario: You do sports in the morning in a fasted state (i.e. without consuming any calories after waking). Your brain of course needs glucose and your liver probably still has ...
0
votes
0answers
6k views

Abdominal muscles during inspiration/inhalation

During inspiration I am aware that the diaphragm and the external intercostal muscles contract, thus increasing the volume of the thoracic cavity. However, I read on my textbook that during ...
0
votes
0answers
38 views

Does physical exercise of a specific part affect muscles in the other parts of the body?

There is a theory among bodybuilders, that is, if you train big muscle groups (e.g. legs, chest), it will increase the overall growth of muscles all over the body; the trained muscle will release ...
0
votes
0answers
29 views

Model for calculating muscular activity from external measures

A physiologist wants to measure the intensity of the activity of a muscle or muscle group over a certain period of time. But the physiologist cannot measure what happens inside the the muscle itself (...
0
votes
0answers
55 views

Book recommendation on the human muscle system

I would like to learn more about the exact mechanism behind our movements, especially about what happens during intense training when anaerobic state arises.
0
votes
1answer
47 views

How strong of an electric field is dangerous to adult humans?

Given that "a potential difference is introduced over the membrane, the associated electric field induces a conformational strong in the potassium channel" is required for our muscles to move, how ...
-1
votes
1answer
494 views

How many muscles work for a smile and how many when you are sad? [closed]

Muscles works in both cases but it’s seems difficult to understand that how they work
-1
votes
2answers
909 views

Why does flicking a finger generate so much more force than extending it quickly?

Flicking a finger (holding it back with e.g. the thumb while building up "pressure" against the thumb, then releasing) is much more powerful than just uncurling the finger quickly. I tried to do the ...
-1
votes
1answer
5k views

What will happen if the biceps stop contracting and instead triceps contract? [closed]

For example if i bend my arm the biceps contract and triceps relax but if I bend my arm and the triceps contract instead of biceps what effect would it have?
-2
votes
1answer
42 views

Does alcohol really helps to get substances get faster into the bloodstream? [closed]

I saw the video where Arnold Schwarzenegger cooks some protein cocktail and adds Austrian Schnapps to the mix, saying that it's to make everything get faster to the blood. Is it true or some kind of a ...
-2
votes
1answer
39 views

Do people with higher body hair growth (eg. Women with hirutism) need more protein? [closed]

Hair is protein. Does that mean that the body of a woman with hirutism is using more than usual protein to make hair and thus she needs more for building and repairing muscles?
-5
votes
1answer
55 views

Why Can't Muscles Push When They Return To Their Original Length?

I understand that muscles can only contract and shorten and thus can only pull, but why can't a muscle push when it relaxes and returns to its initial length?

1 2 3 4 5
6