The myelination of central and peripheral axons occurs rapidly through the first few years of life. How can this developmental process explain the improved motor abilities of infants and toddlers?
What will be an ideal response?
Without full myelination, information about limb movement and body position moves slowly to the CNS, and motor commands move slowly and erratically to the muscles. By the time the brain is aware of movement or position and can issue a motor command, the limb has already moved. When the motor command reaches the skeletal muscle, the response is no longer appropriate. As the neurons become fully myelinated, information processing speeds up, so we observe improved balance, coordination, and movement.
You might also like to view...
RNA that has the function of bringing amino acids to the ribosome during translation is called ________ RNA.
A. messenger B. transfer C. ribosomal D. nuclear
The second energy level of an atom:
a. has four orbitals b. can hold eight electrons c. is a lower energy level then the first energy level d. both A and B above
What is the function of Peyer's patches?
A. Guard against pathogens entering the body through the nose or mouth. B. Fight any bacteria moving into the small intestine from the colon. C. Remove anything that may be potentially harmful in lymph. D. Stand guard against and fight any pathogens trying to enter the body.
Acid-base buffer systems minimize pH changes by
A) increasing breathing rate. B) converting weak acids to strong acids. C) promoting the excretion of hydrogen ions. D) converting strong acids to weak acids.