Emery: wedgeTail-swallow

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The human body is made up of more than 60 different types of cells, each performing a specific function to keep us alive and healthy. The most common type of cell found in the body is muscle cells. These cells are responsible for movement and contraction. Muscle cells contain fibers that allow them to move and change shape. These fibers are made up of proteins called actin and myosin. Actin helps to contract the muscle, while myosin helps to relax it. When a muscle contracts, the actin and myosin fibers slide past each other, causing the muscle to shorten. The brain is responsible for sending signals to muscles in the body. The brain sends these signals through nerve cells called neurons. Neurons are specialized cells that allow the brain to communicate with different parts of the body. When a neuron receives a signal from the brain, it releases chemicals into the bloodstream, which then carry the message to other cells. The heart is another vital organ in the human body. The heart pumps blood throughout the body, providing oxygen and nutrients to all cells. Without a functioning heart, the body would not be able to survive for long.