2. The detection data of human body composition analyzer are as follows: weight = muscle content (protein in intracellular and extracellular fluid), inorganic salt content (human body content is about 4kg) and fat content. Muscle has a high metabolic rate.
3. Maintaining certain muscles can promote metabolism and reduce the risk of chronic diseases related to metabolic disorders, such as atherosclerosis, dyslipidemia and diabetes. Similarly, people with sufficient muscle content will be younger and younger than those without muscle at the same age.
Extended data:
skeletal muscle
It is a type of muscle that can be seen and touched. When bodybuilders increase muscle strength through exercise, they exercise skeletal muscle. Skeletal muscles are attached to bones and appear in pairs: one muscle moves bones in one direction and the other moves bones in the opposite direction. These muscles usually contract at will, which means that when they want to contract muscles, the nervous system will instruct them to do so. Skeletal muscle can contract for a short time (twitching) or for a long time (tetanus).
Red and white muscle fibers
Skeletal muscle of human body can be divided into red muscle and white muscle. Red muscle fibers rely on hemoglobin for continuous oxygen supply and long-term contraction and stretching, so that we can carry out daily behavior activities. White muscle fibers expand and contract rapidly through internal rapid chemical reaction (mostly in emergency), which is characterized by long duration and short reaction time, and its reaction time is one quarter of that of red muscle fibers.
smooth muscle
It exists in digestive system, blood vessels, bladder, respiratory tract and female uterus. Smooth muscle can stretch and maintain tension for a long time. These muscles don't contract at will, which means that the nervous system will automatically control them without thinking. For example, the muscles of the stomach and intestines perform tasks every day, but people generally don't notice them.
myocardium
Only in the heart, its biggest feature is endurance and firmness. It can stretch as limited as smooth muscle or contract as powerfully as skeletal muscle. It's just a twitching muscle that doesn't automatically contract. The heart muscle has a fixed contraction law, thus producing a heartbeat. Normal pacemaker cells are normal, and the regularity of myocardial contraction is certain. If pacemaker cells are abnormal, the regularity of myocardial contraction will change.
Baidu encyclopedia-muscle