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Flashcards in Nervous System Deck (26)
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1

CNS

(central nervous system)
- is the main centre for the entire nervous system and is compromised of the brain and spinal cord

2

PNS

(Peripheral nervous system)
- refers to all the neurons that lead to and from the CNS
- it is divided into 2 groups

3

What groups is the PNS divided into?

-Somatic
- Autonomic

4

Somatic

- The nerves in this system relay information from the sensory receptors, to the CNS, then from the CNS to the skeletal muscles
- This process is usually voluntary

5

Autonomic

- Carries impulses from the CNS to the heart and other internal organs, and the body responds involuntary

6

What two ways is the autonomic system important?

- Sympathetic nervous system
- Parasympathetic nervous system

7

Sympathetic nervous system

Is most active when the body is under stress. When you are in a stressful situation, your body will respond with FIGHT or FLIGHT responses

8

Parasympathetic nervous system

Is most active when the body is at rest. After being in a stressful situation, the parasympathetic nervous system (PNS) will return the body back to normal working conditions.

9

When the sympathetic nervous system is in control...

- Dilated pupils
- inhibits flow of saliva
- accelerates heart beat
- dilated bronchi
- inhibits peristalsis and secretion
- converts glycogen to glucose
-inhibits bladder contraction

10

When the parasympathetic nervous system is in control...

- stimulates flow of saliva
- slows heart beat
- constricts bronchi
- stimulates peristalsis and secretion
- stimulates release of bile
- contracts bladder

11

Explain fight or flight responses:

your body gears up to control your organs in times of stress, & especially when your in a scary situation

12

Glycogen

Extra glucose stored as large molecules in the liver that can be used as energy later

13

Cerebellum

Is involved in the unconscious coordination of posture, reflexes, body movements, and voluntary motor skills
- LOCATED below and behind the cerebrum

14

Medulla Oblongata

Helps regulate breath, heart, & blood vessel function
LOCATION: sits at the base of the brainstem where it connects the brain with spinal cord

15

Pons

serves as a relay centre between neurons of the right left halves of the cerebellum, cerebrum, & rest of the brain
LOCATED: infront of the medulla oblongata in the brainstem

16

Midbrain

Processes information from sensory neurons in the eyes, ears, & nose. It relays visual & auditory information
LOCATED: above pons in brainstem

17

Cerebrum

Is the largest part of the brain and contains the centres for learning, memory, conscious, & language.
- it is divided into the right & left cerebral hemispheres

18

Thalamus

Consists of neurons that provide connections between different parts of the brain. These connections are mostly between the forebrain & hindbrain, & between areas of the sensory system & cerebellum
LOCATION: sits at the base of the forebrain

19

Hypothalamus

Regulates the body's internal environment, by controlling the blood pressure, heart rate, body temp. & emotions
LOCATION: lies below the thalamus

20

Corpus Collosum

Sends messages from one hemisphere to another

21

Pituitary Gland

Produces critical hormones which control various bodily functions

22

Myelinated Neurones

Form white matter, which forms the inner region of the brain & outer area of the spinal cord

23

Unmyelinated Neurones

Form grey matter which is found around the outside of the brain & forms the H-shaped core of the spinal cord

24

Meninges

Protects the spinal cord & bony vertebrae, & brain with 3 layers of tissue

25

Cerebrospinal Fluid

Is a clear dense fluid that transports hormones, white blood cells, & nutrients across the blood brain barrier to the cells of the brain

26

Blood brain barrier

Separates the blood from the CNS & controls the entrance of substances into the brain from the blood
Eg.) Lipid soluble substances (caffeine, alcohol, & nicotine) have rapid effects since they can directly pass through the barrier