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The term used to describe the physical exertion required to perform a task is called "work." Work is a measure of energy expended and is typically expressed in units of joules. Work is performed when a force is applied to an object and the object moves in the direction of the force.

There are approximately 639 muscles in the human body. The exact number can vary depending on the definition of what constitutes a muscle, but there are around 639 skeletal muscles that are responsible for movement.

The term used to describe the physical exertion required to perform a task is called "work." Work is a measure of energy expended and is typically expressed in units of joules. Work is performed when a force is applied to an object and the object moves in the direction of the force.

A disease caused by a virus is referred to as a viral infection. A virus is a small infectious agent that can cause a wide range of diseases, from the common cold to more serious conditions like HIV/AIDS and Ebola. Viral infections can be spread from person to person through bodily fluids, air droplets, or contaminated surfaces.

The cerebellum is located in the back of the brain and is responsible for coordinating movement, balance, and posture. It works in conjunction with the motor cortex and other brain regions to produce smooth and coordinated movements. The cerebellum also plays a role in coordinating sensory information, including information from the eyes and inner ear, to maintain balance and stability. Additionally, it is involved in learning motor skills and adjusting movements based on feedback from the environment.