Biology Revision Notes- Nervous System

AQA Biology, Energy and Continuity - Nervouse System

HideShow resource information
Preview of Biology Revision Notes- Nervous System

First 307 words of the document:

Biology Revision Notes:
The nervous system:
Receptor ­ detects stimuli
Effectors ­ responds to a stimuli e.g. muscles and glands
Irritability ­ the ability to detect and respond to stimuli
Feedback control ­ when a change is detected by a receptor then
corrector by an effecter and the effecter is then inhibited
Five Kingdoms ­ Planta, Animalia, Fungi, Protoctista, Prokaryotae
Advantages of having a nervous system ­ (1) allows increased
sensory perception of both the external and internal environments
of the organism (2) allows for the development of flexible
behaviour patterns e.g. learning (3) in a mobile organism it allows
for the selection of increased size whilst maintaining a rapid
response to the external environment.
Sensory system ­ conveys nerve impulse from receptors to the
Motor system ­ conveys nerve impulses from the CNS to muscles
and glands
Somatic system ­ conveys nerve impulses from CNS to skeletal
Autonomic system ­ conveys nerve impulses from CNS to smooth
muscle, cardiac muscle and glands.
Sympathetic system ­ regulates levels of "excited ness" in the
Parasympathetic system ­ regulates "resting levels" in the body
Three types of neurone:
Spinal nerves ­ arise from the spinal cord, supply
arms, body, and legs and are all mixed nerves
Cranial nerves ­ arises from ventral surface of the
brain. Most are concerned with head including ears
and eyes
Axons ­ transmit nerve impulses AWAY from the cell body
Dendrons ­ transmit nerve impulses TOWARDS cell body
Not terminal The cell body is terminal
Has an axon No dendron, Axon only
Cell body is smooth and has no Has dendrites

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Electrochemical impulses along Chemicals travel in blood
Rapid transmission Slower transmission
Immediate response Slower response
Short-lived response Long-term response
Response exact Response widespread
Hypothalamus ­ responsible for regulation of body temperature,
plasma water potential and initiation of menstrual cycle
Pituitary body ­ known as the "master gland" it controls many of
the endocrine glands
Medulla oblongata ­ responsible for the regulation of breathing and
heart rate
Cerebellum ­ coordinates muscular movement
Left hemisphere ­ language, reading, writing skills
Right hemisphere ­ imagination, humour, music,…read more


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »