divisions of the nervous system

Question 1

What is the nervous systems two subcategories?

Answer 1

-Central nervous system
-Peripheral nervous system

Question 2

What is the central nervous system’s (CNS) function?

Answer 2

Complex processing.

Question 3

What is the CNS’s two subcategories?
What are their roles?

Answer 3

-Brain: all conscious and most unconcscious processing
-Spinal cord: receives and transmits info, some reflex processing

Question 4

What is the peripheral nervous system’s (PNS) function? E.g?

Answer 4

-Body wide network of messenger neurons
E.g Sensory neurons to CNS, motor neurons away from the CNS

Question 5

What is the peripheral nervous system’s subcategories?
What are their functions? (2)

Answer 5

-Somatic nervous system (SNS): controls skeletal muscles, voluntary system.
-Autonomic nervous system (ANS): controls actions of internal organs and glands, involuntary system.

Question 6

What are the autonomic nervous system’s subcategories?

Answer 6

-Sympathetic
-Parasympathetic

Question 7

What is the role of the sympathetic?
What does it release?
What does it activate?

Answer 7

-Increases bodily activities e.g. increase is heart rate, sweat, breathing rate, dilated pupils
-Releases noradrenaline
-Activates stress response in fight or flight

Question 8

What is the role of parasympathetic?
What does it release?
What does it activate?

Answer 8

-Decreases bodily activities e.g decrease in heart rate, sweat, breathing rate, constricts pupils
-Release of acetylcholine
-Activates in rest in rest and digest

Question 9

What is maintaining homeostasis? (2)

Answer 9

-Regulation of the internal environment
-In normal conditions there is a balance between sympathetic and parasympathetic systems