Chapter 1.2

Question 1

What are the three types of nervous cells

Answer 1

-sensory neurons

• interneurons
• > located predominantly in the brain and spinal cord
• > involved in reflex arcs which controls reflexes
• > by the time info makes it to the brain, the reflex arc has already carried out the action

-motor neurons

Question 2

What is the CNS composed of

Answer 2

-the brain and the spinal cord

Question 3

What is the PNS composed of? What is the function of the PNS?

Answer 3

• the nerve tissue and fibers outside of the brain/spinal cord
• includes 31 pairs of spinal nerves and 12 pairs of cranial nerves
• the function of the PNS is to connect the CNS to the rest of the body

Question 4

What is the PNS divided into? What two parts

Answer 4

-it is divided into the somatic nervous system and the autonomic nervous system

Question 5

What does the somatic nervous system consist of? How does it transmit its information

Answer 5

• it consists of sensory and motor neurons distributed through the joints, muscle and skin
• sensory neurons transmit information through afferent fibers
• motor neurons transmit information through efferent fibers

Question 6

What is the autonomic nervous system associated with? What functions does it regulate?Is it involved in regulating body temperature?

Answer 6

• it is associated with functions that involve involuntary organs and glands
• > this involves glandular secretions, digestion, respiration and heartbeat
• they are independent of conscious control
• yes
• > it regulates body temperature through sweating or piloerection(goosebumbs when cold)

Question 7

What two components are the autonomic nervous system composed of?

Answer 7

-it is composed of the sympathetic and the parasympathetic nervous system

Question 8

What is the relationship between the parasympathetic and the sympathetic nervous system. Go over their specific functions on page 9.

Answer 8

• they have an antagonistic relationship
• the parasympathetic is rest and digest
• > it conserves energy
• the sympathetic is fight or flight
• > activated by stress