BIO 253 HONDROS TEST 3 MOCK EXAM AND STUDY MATERIAL WITH PHYSIOLOGY APPLICATION QUESTIONS AND SCENARIOS

BIO 253 HONDROS TEST 3 MOCK EXAM AND
STUDY MATERIAL WITH PHYSIOLOGY
APPLICATION QUESTIONS AND SCENARIOS

◉ ependymal cells
Answer: line ventricles
move CSF
circulate CSF in ventricle of brain and central canal of spinal cord


◉ oligodendrocytes
Answer: make up myelin sheath in CNS


◉ schwann cells
Answer: make up myelin sheath in PNS


◉ depolarization
Answer: Na+ channels open and Na+ moves inside cell
inside the cell becomes more positive


◉ repolarization
Answer: K+ moves out of cell

,goes back to normal state
inside cell becomes more negative


◉ ventral roots of spinal cord
Answer: motor neurons
multipolar


◉ dorsal roots of spinal cord
Answer: unipolar
sensory neurons


◉ Nerves of the PNS
Answer: 12 Cranial nerves
31 Spinal nerves
Afferent-nerve impulse toward CNS
Efferent-nerve impulse away from CNS


◉ function of CNS
Answer: integrate all cell impulses from body and send out
commands


◉ What does myelin sheath do?

, Answer: covers white matter
speeds up nerve impulses
NO myelin sheath in gray matter


◉ relative refractory
Answer: Na+ gate channel closes--Repolarization


◉ saltatory conduction
Answer: nerve impulse jumps from node-to-node in myelinated
nerve fiber


◉ action potential
Answer: ion distribution at rest in a membrane
K+ inside cell
Na+ outside cell


◉ absolute refractory period
Answer: neuron doesn't conduct any impulses
nothing happens-depoolarization


◉ cerebral lobe resp. for voluntary movement
Answer: frontal lobe