单元 7 - 7D

The leg is a major part of the human body that extends from the hip to the foot, providing support, mobility, and locomotion. It consists of bones, such as the femur, tibia, and fibula, along with muscles, ligaments, blood vessels, and nerves. The leg enables walking, running, and various movements, playing a crucial role in everyday activities and physical performance. Understanding the anatomy and function of the leg is essential for maintaining proper posture, balance, and overall musculoskeletal health.

A cut is a break or opening in the skin caused by something sharp, like a knife or glass. Cuts can vary in depth and seriousness, from small superficial ones that only affect the surface to deeper ones that may penetrate layers of tissue. They often result in bleeding, pain, and sometimes swelling around the affected area. Treatment for cuts involves cleaning the wound with soap and water to prevent infection, applying pressure to stop bleeding, and covering it with a clean bandage. In some cases, medical attention may be necessary, especially for deep cuts that may require stitches to close properly.

A headache refers to pain or discomfort experienced in the head or upper neck area. It can have various causes, including tension, stress, dehydration, lack of sleep, sinus infections, or underlying health conditions like migraines. Interestingly, different areas of head pain can signify different things. For instance, pain concentrated in the temples might indicate tension headaches, while throbbing pain on one side of the head could signal a migraine. Additionally, pain focused behind the eyes might suggest a sinus headache. Treatment often involves rest, hydration, over-the-counter pain relievers, and addressing any underlying issues contributing to the headache.

An injection is a method of delivering medication or fluids into the body using a needle and syringe. It can be given into different areas, such as a muscle, vein, or under the skin, depending on the type of medication and its intended effect. Injections are used for vaccines, pain relief, hormones, and other treatments that need to be given directly into the bloodstream or tissues.

A painkiller is a type of medication used to alleviate pain. Painkillers work by blocking or reducing the feeling of pain signals in the brain and nervous system. These medications are commonly prescribed or available over-the-counter and are used to manage various types of pain, from mild to intense.

A sneeze is a sudden and uncontrolled release of air, often with mucus, from the nose and mouth, often accompanied by a unique sound. It is a reflex action triggered by irritation or stimulation of the nasal passages, such as from dust, allergens, or viruses. Sneezing helps to clear the nasal passages of irritants and is a natural defense mechanism of the body to protect the respiratory system from potential harm. While sneezing is usually harmless, it can sometimes be a symptom of an underlying condition, such as allergies or a cold.

A bruise is a mark on the skin caused by injury, where blood vessels underneath the skin break and leak blood into the surrounding tissue. Typically, bruises appear as discolored patches ranging from blue and purple to yellow or green as they heal. They are often tender to the touch but usually fade away over time as the body reabsorbs the leaked blood and repairs the damaged tissue.

A stomachache refers to pain or discomfort felt in the abdominal area. It can range from mild to intense and may be accompanied by other symptoms such as nausea, bloating, gas, or diarrhea. Stomachaches can have various causes, including indigestion, overeating, food poisoning, infections, menstrual cramps, or underlying conditions like gastritis or gastroenteritis. Treatment often involves rest, drinking plenty of fluids, avoiding spicy or fatty foods, and over-the-counter medications like antacids or pain relievers. In some cases, seeking medical attention may be necessary, especially if the pain is intense, constant, or accompanied by other concerning symptoms.

A toothache refers to pain or discomfort experienced in or around a tooth. It can range from mild to intense and may be constant or come and go. Toothaches can have various causes, including tooth decay, cavities, gum disease, infection, or grinding of teeth. The pain may be focused at a specific tooth or spread to other areas of the jaw or head. Treatment often involves addressing the underlying cause, such as filling a cavity, treating an infection with antibiotics, or performing a root canal. Over-the-counter pain relievers or numbing ointments can help manage pain temporarily. However, it is essential to see a dentist for proper diagnosis and treatment to prevent further complications.