你的大脑和肌肉会达成完美的平衡以帮助你达成目标 First, your brain sends a signal to motor neurons inside your arm. 首先,你的大脑给遥控你手臂的神经发射信号 When they receive this message, they fire, 神经接受信号之后,开始行动 causing muscles to contract and relax, 引起肌肉收缩与放松 which pull ...
Muscle is the fibrous tissue in the body that has the ability to contract (when asked to do so by the brain). When a muscle contracts, it shortens (becomes smaller). Muscles are attached to the bones of our skeleton (through strong fibres called tendons). So, when the muscle attached ...
Smooth muscle is found in the walls of hollow organs like your intestines and stomach. They work automatically without you being aware of them. Smooth muscles are involved in many 'housekeeping' functions of the body. The muscular walls of your intestinescontract to push food through your body....
It sounds good, but running increases blood flow and not too many distance runners have big legs. The ATP debt theory is that muscles use ATP contract, so ATP will break down and the waste products will trigger increased blood flow and growth. It has been discounted because ATP levels are ...
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The muscles located in the atria that contract are called the pectinate muscles. These muscles form parallel ridges on the inside of the atria that...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough ...
Phase 3: Orgasm.Sexual excitement reaches its peak. You feel a series of intense muscle contractions as your body releases the tension. The muscles of the vagina and the uterus contract. Muscles at the base of the penis tighten and release, releasingsemenin an ejaculation. ...
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But if the muscles contract, then the sac expands, and you can see the colors. And by expanding different combinations of these color sacs to different degrees, the octopus can create all sorts of colors. Ah yes, Elizabeth?Female Student: And just with various combinations of those five ...
Muscles also increase in firmness, which is called tonus or tone. Tone refers to the resting tension of a muscle and its readiness to contract. Muscle tone and muscle maturity are closely related. These structural changes are far longer lasting and tend to endure even if you have a prolonged...