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  There are about 600 muscles in the human body. The three main types of muscle include skeletal, smooth and cardiac. The brain, nerves and skeletal muscles work together to cause movement – this is collectively known as the neuromuscular system. Different types of muscle The three main types of muscle include: Skeletal muscle  – the specialised tissue that is attached to bones and allows movement. Together, skeletal muscles and bones are called the musculoskeletal system (also known as the locomotor system). Generally speaking, skeletal muscle is grouped into opposing pairs such as the biceps and triceps on the front and back of the upper arm. Skeletal muscles are under our conscious control, which is why they are also known as voluntary muscles. Another term is striated muscles, since the tissue looks striped when viewed under a microscope. Smooth muscle  – located in various internal structures including the digestive tract, uterus and blood vessels such as arteries. Smooth muscle i

Fat is essential for several bodily functions. It is an energy source, and it protects the skeleton and nerves. Fat also makes it possible for other nutrients to do their jobs. However, not all dietary fats are equally beneficial: Saturated and trans fats  can raise cholesterol levels and increase disease risk. Unsaturated fats  support health and may be monounsaturated or polyunsaturated. Meats, dairy products, snack foods, and baked goods contain saturated and trans fats. Some sources of unsaturated — healthful — fats include nuts, oils, seeds, and avocados. Fats are classified in a range of ways, depending on their attributes: Fats or fatty acids : These terms can refer to any type of fat, but “fats” usually describes those that are solid at room temperature. Lipids : This can refer to any type, regardless of whether it is liquid or solid. Oils : This can describe any fat that is liquid at room temperature. Animal fats : Among these are butter, cream, and fats in meats, such as lard