BIOLOGICAL BASES OF BEHAVIOR
THE NERVOUS AND ENDOCRINE SYSTEMS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The nerve impulse would not be able to cross the synapse.
|
|
|
The nerve impulse would slow down across the axon.
|
|
|
The person would have seizures.
|
|
|
There would be mo blood supply to the neuron.
|
Detailed explanation-1: -It is made up of protein and fatty substances. This myelin sheath allows electrical impulses to transmit quickly and efficiently along the nerve cells. If myelin is damaged, these impulses slow down. This can cause diseases such as multiple sclerosis.
Detailed explanation-2: -If the myelin sheath surrounding nerve fibres is damaged or destroyed, transmission of nerve impulses is slowed or blocked. The impulse now has to flow continuously along the whole nerve fibre – a process that is much slower than jumping from node to node.
Detailed explanation-3: -what would happen if a neuron were to lose its myelin sheath? When the myelin sheath is damaged, nerves do not conduct electrical impulses normally. However, if the sheath is severely damaged, the underlying nerve fiber can die. in what order does impulse travel through parts of a neuron?
Detailed explanation-4: -Demyelination: Loss of myelin is associated with slowing of conduction velocity (slower than 75% of the lower limit of normal), marked prolongation of distal latency (longer than 130% of the upper limit of normal), or both. Amplitude changes can also occur with demyelination due to secondary axonal loss.
Detailed explanation-5: -By acting as an electrical insulator, myelin greatly speeds up action potential conduction (Figure 3.14). For example, whereas unmyelinated axon conduction velocities range from about 0.5 to 10 m/s, myelinated axons can conduct at velocities up to 150 m/s.