The weight of adult brown fat is generally less than 2% of body weight. Brown adipose tissue is brown in appearance, with a large number of fat droplets and high concentration of mitochondria in cells, and a large number of capillaries and sympathetic nerve fiber endings between cells, forming a complete thermogenic system. At present, it is considered that the function of brown adipose tissue is similar to that of "heat generator", which mainly generates heat through uncoupled oxidative phosphorylation of fatty acids in cells, and generates a lot of heat when the body eats or meets cold.
There are obvious differences in distribution, morphology and function between white adipose tissue and brown adipose tissue in the body. First of all, in terms of quantity, the number of white adipose tissue in the body is significantly higher than that of brown adipose tissue. White adipose tissue is widely distributed around subcutaneous tissue and internal organs. Its main function is to store excess energy in the body in the form of neutral fat for use when the body needs it. It is the main storage form of body fat.
Therefore, if you are thin and afraid of the cold, a better choice is fitness.
Fitness is the best choice.
Fitness can not only strengthen the body, but also enhance immunity.
It can also prevent diseases, maintain good joint function and improve body shape.
Balance muscles (muscle strength) and improve body posture.
Physical fitness level and performance of weightlifters
Improve the ability of daily physical activities
Help achieve and maintain an appropriate weight.
Help achieve and maintain proper body composition.
Improve anxiety and depression
Prevent muscle recession and strain.
Slow down bone aging and prevent osteoporosis.
Applied to physics * * * *
Of course, there must be a careful fitness plan and continuous action to carry out fitness training.
It's good to have muscles. I have been going to the gym for five years. You don't need an electric mattress to sleep at home
Is muscle cold-resistant or fat cold-resistant?
There are about 639 human muscles. It consists of about 6 billion muscle fibers, the longest is 60 cm, the shortest is only about 1 mm, the big muscle weighs about two kilograms, and the small muscle weighs only a few grams.
The average person's muscles account for about 35% to 45% of the body weight.
According to different structures and functions, it can be divided into smooth muscle, myocardial muscle and skeletal muscle, and according to morphology, it can be divided into long muscle, short muscle, platysma muscle and orbicularis oris muscle. Smooth muscle is mainly composed of internal organs and blood vessels, which has the characteristics of slow contraction, long duration and no fatigue. Myocardium constitutes the heart wall, and neither of them contracts with human will, so it is called involuntary muscle.
Skeletal muscles are distributed in the head, neck, trunk and limbs, and are usually attached to bones. Skeletal muscle contracts rapidly, forcefully and easily, and can contract and contract with people's will, so it is called voluntary muscle. Skeletal muscle is striated under the microscope, so it is also called striated muscle.
The cold resistance of muscle is stronger than that of fat. Because muscle is muscle, it is the * * and reserve of strength.
It must be a muscular man. Of course. Did you see those athletes who trained in winter swimming?
Which is better in beating resistance, fat meat or muscle? It is often said that fat people are resistant to beating, but some fat people are not in my opinion. It hurts to punch a few times.
First of all, muscle and fat are not antagonistic, they coexist. A person can't have only muscles all over his body, and he can't have fat all over his body.
One is outside and the other is inside. In any case, the fat is stressed first, and then the muscle.
Besides, it's inevitable that you say it's difficult to hit the muscles.
Because the structure of muscle and fat is completely different, muscle can become strong through contraction, which is caused by a lot of congestion.
Besides, you said hitting it would hurt your hand. That's your problem, because no matter how hard your muscles are, you can't hurt your hands. After all, it is much worse than sandbags.
I don't know if you can understand these words. Although I didn't tell you directly which one is more durable, the answer is ready.
Fat, fat, its function is originally anti-impact, but if the nerve is on fat, it will still hurt, but if the muscle is trained and has not been beaten, relatively speaking, I am afraid it is really worse than fat.
I want to tell the landlord that the so-called abdominal fight is not aimed at the meat in the abdomen (regardless of muscle fat). Muscles will hurt more when they fight. Fat is stronger than muscle, and muscle plus fat is the most resistant! simple