Chapter 8.1

Question 1

What is the principal organ of the nervous system?

Answer 1

Brain

Question 2

What division of the nervous system includes the brain and spinal cord?

Answer 2

Central nervous system

Question 3

What is the thick bundle of nerve fibers located within the spinal cavity?

Answer 3

Spinal cord

Question 4

What is the triple-layer of protective tissue that covers the brain and spinal cord?

Answer 4

Meninges

Question 5

What is the clear fluid that cushions your brain when you bump your head?

Answer 5

Cerebrospinal fluid

Question 6

What is the short branched extension of the cell that receives nerve impulses from other neurons and conducts them toward the cell body?

Answer 6

Dendrite

Question 7

What is the white covering that gives the white matter of the brain its color?

Answer 7

Myelin

Question 8

What type of neurons relay signals between neurons or groups of neurons?

Answer 8

Interneurons

Question 9

What are the tightly sealed capillary walls of the brain?

Answer 9

Blood Brain Barrier

Question 10

What is an infection of the meninges called?

Answer 10

Meningitis

Question 11

What is a serious disease that affects the spinal cord, destroys some of the motor neurons, and can leave its victims paralyzed?

Answer 11

Poliomyelitis (polio)

Question 12

What makes up the peripheral nervous system?

Answer 12

Nerves

Question 13

What is the term for nerves that have both sensory and motor fibers?

Answer 13

Mixed nerves

Question 14

What is the part of the peripheral nervous system that controls the heart and other internal organs?

Answer 14

Autonomic nervous system

Question 15

What division of the nerves responds to your body’s needs during increased activity and in emergency situations?

Answer 15

Sympathetic division

Question 16

What division of the nerves balances to counteract the other division?

Answer 16

Parasympathetic division