Aliya Hussain
Unit 9.1: regulation of the cardiovascular & respiratory system
Context
Page number Context
2-8 P1
8-18 M1
18-23 D1
24-26 Bibliography
1
,Aliya Hussain
Human nervous system organisation
Figure 1
Identification and function of human nervous system
Identification
The human nervous system has been divided into two, the peripheral nervous
system (PNS) and the central nervous system (CNS). The CNS consists of the
brain and spinal cord. The peripheral nervous system (PNS) is an extensive
network of nerves sending information to the central nervous system from
external stimuli or internal organs and motor nervous cells that carry
information to organs, muscles and glands from the CNS.
The peripheral nervous system is then divided into two, the autonomic
nervous system and the somatic nervous system. The autonomic nervous
system is part of the nervous system which regulates the involuntary
movements in the body and the somatic nervous system is part of the nervous
system which controls the voluntary movements in the body.
2
, Aliya Hussain
Function
The human nervous system uses specialised cells called neurons to send
signals, or messages all over the body. These electrical signals travel between
the brain, skin, organs, glands and muscles. The messages help move limbs and
feel sensations, such as pain.
Motor and sensory neurons
Motor neuron
figure 2
Structure Description
Cell body Function is to obtain information
from other cells and carry that
information to the cell body.
Dendrites Receives impulses from other
neurons and sends them towards the
cell body.
Axon Carried nerve impulses away from
the cell body.
Myelin provide insulation/protection to the
axons of the neuron it surrounds.
Node of ranvier Allow for ions to diffuse in and out of
the neuron, spreading the electrical
3
Unit 9.1: regulation of the cardiovascular & respiratory system
Context
Page number Context
2-8 P1
8-18 M1
18-23 D1
24-26 Bibliography
1
,Aliya Hussain
Human nervous system organisation
Figure 1
Identification and function of human nervous system
Identification
The human nervous system has been divided into two, the peripheral nervous
system (PNS) and the central nervous system (CNS). The CNS consists of the
brain and spinal cord. The peripheral nervous system (PNS) is an extensive
network of nerves sending information to the central nervous system from
external stimuli or internal organs and motor nervous cells that carry
information to organs, muscles and glands from the CNS.
The peripheral nervous system is then divided into two, the autonomic
nervous system and the somatic nervous system. The autonomic nervous
system is part of the nervous system which regulates the involuntary
movements in the body and the somatic nervous system is part of the nervous
system which controls the voluntary movements in the body.
2
, Aliya Hussain
Function
The human nervous system uses specialised cells called neurons to send
signals, or messages all over the body. These electrical signals travel between
the brain, skin, organs, glands and muscles. The messages help move limbs and
feel sensations, such as pain.
Motor and sensory neurons
Motor neuron
figure 2
Structure Description
Cell body Function is to obtain information
from other cells and carry that
information to the cell body.
Dendrites Receives impulses from other
neurons and sends them towards the
cell body.
Axon Carried nerve impulses away from
the cell body.
Myelin provide insulation/protection to the
axons of the neuron it surrounds.
Node of ranvier Allow for ions to diffuse in and out of
the neuron, spreading the electrical
3
