The video explains how motor neurons function to control muscle contractions. It covers the roles of upper and lower motor neurons, the process of signal transmission, and the impact of neuron injuries. The video also discusses the importance of the myelin sheath in preventing signal dissipation and ensuring efficient communication between neurons and muscles.

What is the primary role of motor neurons?

• To control hormone release

• To tell muscles to contract

• To regulate blood flow

• To send sensory information to the brain

What are the two main functions of upper motor neurons?

• To send signals to lower motor neurons and regulate blood pressure

• To tell muscles to contract and to tell lower motor neurons to stop

• To control sensory input and muscle contraction

• To manage hormone levels and muscle relaxation

What is the soma in a lower motor neuron?

• The fatty sheath around the axon

• The body of the lower motor neuron

• The part that sends signals to the brain

• The muscle that receives the signal

What happens if there is an injury to a lower motor neuron?

• The signal will bypass the injury

• The muscle will continuously contract

• The muscle will become weak and unable to contract

• The signal will be amplified

What is a key characteristic of an upper motor neuron injury?

• Muscle weakness

• Increased blood flow

• Spastic muscle contractions

• Loss of sensory input

What is the function of the myelin sheath?

• To regulate hormone levels

• To send signals to the brain

• To insulate the axon and prevent signal dissipation

• To control muscle contraction

What are the myelin sheath cells called in the central nervous system?

• Soma cells

• Schwann cells

• Oligodendrocytes

• Dendrites

What are the myelin sheath cells called in the peripheral nervous system?

• Dendrites

• Soma cells

• Oligodendrocytes

• Schwann cells

What is the node of Ranvier?

• The body of the neuron

• An empty space between myelin sheath cells

• The end of the axon

• A type of myelin sheath cell

How does the signal propagate along the axon?

• It moves in a circular motion

• It moves continuously along the axon

• It jumps from node to node

• It dissipates along the way