Explanation:
Physiology is the study of animal (including human) function and can be investigated at the level of cells, tissues, organ systems and the whole body. The underlying goal is to explain the fundamental mechanisms that operate in a living organism and how they interact.
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.
Answer:
A. their blood pressure becomes elevated, forcing more fluid into interstitial spaces as blood hydrostatic pressure rises.
Explanation:
Edema is characterized by an increase in the amount of interstitial fluid in a tissue or within a cavity. The fluid accumulated in edema is formed by an aqueous solution of salts and proteins from the blood plasma. An edema can have various causes, such as changes in the wall of a capillary, decreased plasma oncotic pressure, increased hydrostatic blood pressure, sodium retention, and decreased lymphatic drainage.
In people who are confined to bed for long periods of time they usually develop edema because blood pressure rises, forcing more fluid into the interstitial spaces as hydrostatic blood pressure increases.
