Part 1- Nervous System

Question 1

What are the 2 main parts of the nervous system?

Answer 1

1. Central Nervous System (CNS) = located within the brain and skull
2. Peripheral Nervous System (PNS) = everything outside the brain and skull
   * peripheral = perimeter*

Question 2

What are the 2 main parts of the Peripheral Nervous System? Describe the first system.

Answer 2

1) The Somatic Nervous System
- controls voluntary movements & interacts with the external environment
- Sensory (afferent) nerves carry the sensory signals from the sensory receptors (skin, eye, ear) to the CNS
- Motor (efferent) nerves carry motor signals from the central nervous system to skeletal muscles

Question 3

What is the other section of the peripheral nervous system?

Answer 3

The Autonomic Nervous System.

• controls involuntary movement & regulates the body’s internal environment
• sensory (afferent) nerves carry sensory signals from internal organs to the central nervous system
• motor (efferent) nerves carry motor signals from central nervous system to internal organs

Question 4

What are the 2 types of nerves in the Autonomic Nervous System?

Answer 4

1. Sympathetic nerves - located in spinal nerves
2. Parasympathetic nerves

Both act on the same organ but have opposite actions

Question 5

What are sympathetic nerves?

Answer 5

Sympathetic nerves are in charge of arousal and feeling
They are responsible for FIGHT - OR - FLIGHT - OR - FREEZE
= the way u act in specific situations when put on the spot (if I see a spider)
- increase heartbeat
- relax airways
- dilate pupils

Question 6

What are parasympathetic nerves?

Answer 6

Parasympathetic = peace

• responsible for maintaining bodily functions while the body is in a state of balance (homeostasis)
• located in 4 cranial nerves
• Activated by Acetylcholine
• Slow heartbeat, constrict airways, constrict pupils

Question 7

What are the 2 main parts of the Peripheral Nervous System? Describe the first system.

Answer 7

1) The Somatic Nervous System
- controls voluntary movements & interacts with the external environment
- Sensory (afferent) nerves carry the sensory signals from the sensory receptors (skin, eye, ear) to the CNS
- Motor (efferent) nerves carry motor signals from the central nervous system to skeletal muscles

Question 8

What is the other section of the peripheral nervous system?

Answer 8

The Autonomic Nervous System.

• controls involuntary movement & regulates the body’s internal environment
• sensory (afferent) nerves carry sensory signals from internal organs to the central nervous system
• motor (efferent) nerves carry motor signals from central nervous system to internal organs

Question 9

What are the 2 types of nerves in the Autonomic Nervous System?

Answer 9

1. Sympathetic nerves - located in spinal nerves
2. Parasympathetic nerves

Both act on the same organ but have opposite actions

Question 10

What are sympathetic nerves?

Answer 10

Sympathetic nerves are in charge of arousal and feeling
They are responsible for FIGHT - OR - FLIGHT - OR - FREEZE
= the way u act in specific situations when put on the spot (if I see a spider)