The body of Rana chensinensis in China is mainly composed of skin, skeletal system, muscle system, digestive system, respiratory system, circulatory system, excretory system, nervous system, endocrine system and sensory system.
1. China Rana chensinensis has naked skin, no scales and no bone covering, and has the functions of protecting, breathing and regulating body temperature. The skin of Rana chensinensis is composed of epidermis and dermis, but the skin structure is not perfect, and its function of preventing water from emitting is poor. The skin contains a large number of multicellular glands, which secrete mucus to the body surface to keep the body moist. There are pigment cells in epidermis and dermis of Rana chensinensis skin, which are mesenchymal cells with pigment. Its distribution, quantity and physiological changes determine the body color of Rana chensinensis in China. The change of body color of China Rana chensinensis adapts to the change of environment, so the body color of China Rana chensinensis can protect China Rana chensinensis from enemies.
2. Skeleton system Skeleton is the hard support of the body, which can not only maintain a certain shape of the body, but also protect the internal organs of the body. The skeletal system of Rana chensinensis in China is mainly composed of hard bones, including axial bones and appendage bones. Skull, spine and sternum are axial bones; Shoulder straps, belts and limbs belong to appendage bones.
3. The function of flesh and blood in the muscle system is to form body walls, limbs and various organs, and make these organs and limbs move. All muscles of frog body can be divided into skeletal muscle, smooth muscle and cardiac muscle. Skeletal muscles are striated muscles, also known as voluntary muscles, which are mostly connected with bones. They are very mobile, but they can't last long and get tired easily. The muscles of the body wall and limbs are striated muscles, and the muscles that make up the internal organs such as stomach, distension and bladder are smooth muscles, also called involuntary muscles, which can exercise continuously for a long time without fatigue. Myocardium is a special muscle that constitutes the heart. Strong contractility, can exercise continuously for a long time. Accessory muscles are particularly developed and consist of complex muscles.