Lesson 6- The Nervous System

Question 1

central nervous system

Answer 1

coordinates info to pns. consists of nerves of brain and spinal cord

Question 2

peripheral nervous system

Answer 2

nerves outside of brain and spinal cord. relaying info between cns and rest of body. voluntary; somatic and relays sensory and motor info, involuntary; autonomic and relays info between internal organs and cns

Question 3

nerve cells

Answer 3

glial cells (schwann) and neurons

Question 4

glial cells

Answer 4

non-conductory; insulate and protect organs, supply neurons with oxygen and nutrients, facilitate transmission of nervous impulses. divide to replace damaged cells

Question 5

schwann cells

Answer 5

form tightly wrapped layers of plasma membrane (myelin sheaths), speed up messaging, and have gaps (node of ranvier)

Question 6

neurons

Answer 6

conducting cells; made up of enlarged cell body, dendrites and exons. divided into three groups; sensory, inter, and motor.

Question 7

dendrites

Answer 7

projection carries signals toward the cell body (branched, multiple for lots of signals)

Question 8

axons

Answer 8

extenstion that carries nerve signals away from cell body

covered with myelin sheath and axon hillock

Question 9

sensory neurons

Answer 9

carry info from sensory receptors to cns

Question 10

interneurons

Answer 10

major component of cns that relay info from sensory neurons to motor neurons

Question 11

motor neurons

Answer 11

carry info from the cns to effectors (muscles organs and glands)

Question 12

reflex arc

Answer 12

neural circuits that travek through spinal cord for don’t need brain coordination. reflex actions like putting a hand on a hot stove