The right answer is False. (An important element missing from the definition of motor unit are motor neurons.)
A motor unit is composed of an alpha motor neuron and the muscle fibers it innervates.
Groups of motor units often work together to coordinate the contractions of a single muscle. All motor units that serve the same muscle are considered to be a group of motor units. The number of muscle fibers connected to each unit can vary: the muscles of the thigh can have up to a thousand fibers per unit, the muscles of the eyes can have only ten. In general, the number of muscle fibers involved in a motor unit is a function of the muscle's need for its refined movement: the more the muscle will need a fine movement, the less the motor unit will involve synapses with the muscle fibers.
<span>HIV is increasingly recognized as an illness that affects couples and families, and not just the individual. This is not only because the virus can be passed on from one person to another, but also because for every person infected with HIV, there is a family and community that are also affected.</span>
Answer:
It depends. If cheering up impedes our personal progress, than we should seek to improve first. But cheering up can be helpful at times when depression impedes progress/normal functioning. It is generally healthier to be cheerful than to be gloomy and depressed.
Explanation:
