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Summary BTEC Applied Science: Unit 9 Learning aim A

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Human regulation and reproduction, learning aim A, Distinction grade level, references included











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October 4, 2022
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The nervous system
The nervous system is a complex system of cells and organs such as the brain and spinal
cord, which make up the central nervous system, and a network of nerves around your body
that make up the peripheral nervous system. The nervous system helps you walk, talk, and

,balance, all important to everyday life. The function of the nervous system allows the body to
carry out the necessary actions, such as contact with a hot service and removing one’s
hand, helping the body coordinate to walk. The nervous system is vital in helping to regulate
mechanisms inside and outside the body. (1)

The foundations of the nervous system motor neurons and sensory neurons

There are two types of cells within the nervous system neuron: motor and sensory ones and
glial cells. Neurons can either be myelinated or unmyelinated. Depending on how they
conduct electrical impulses, the main structure of a neuron is made up of a cell body that
contains the cell body and other organelles, an axon that can be myelinated or unmyelinated
and an axon terminal. Myelinated neurons transmit electrical pulses a lot faster. They are
often found in the peripheral nervous system and help carry electrical impulses from sensory
neurons to the central nervous system or from the central nervous system to affect neurons.
Glial cells, however, help support neurons in processes such as digestion of dead neurons
and the manufacturing process of new components formulas themselves. In the flow chart,
you can see the structure of both a motor neuron and a sensory neuron, and there are
several functions in the structural components of the Neurons carried out. The cell body
provides an area for the cell nucleus and other organelles. These other organelles might be
mitochondria or ribosomes. For example, dendrites are thin extensions extending off the
cytoplasm membrane; these carry out important functions such as as.com conducting
impulses to the cell body and providing a link between different surrounding neurons. The
axon provides the service of transmitting impulses away from the cell body and connecting
them to receive, such as muscles or a gland. The myelin sheath acts as an insulator around
the axon. The myelin sheath consists of multiple Schwann cells that wrap around the axon
and help prevent proteins from moving in and out of the cell, speeding up the transmission
rate of electrical impulses. The axon terminal is situated at the end of the neuron and helps
transmit signals from neuron to neuron.
(2)




Glial cells

These cells do not conduct electrical impulses like motor and sensory neurons do; however,
their primary function is to provide support and installation around the Neurons; they can be
found both in the central nervous system and the peripheral nervous system. There are
different types of cells within each system, and therefore they perform different functions.
(3)-(7)

The central nervous system
The central nervous system or the CNS comprises two components: the brain and spinal
cord. The brain plays a large role in controlling most bodily functions, including movement,
balance, memory and speech. However, some reflex movements are coordinated within the
spinal cord and do not participate in the brain. The spinal cord is connected to the brain by
the brain stem, and the spinal cord provides the service of carrying signals back and forth
from the peripheral nervous system and the Central nervous system .

, The brain
The brain contains many billion neurons and glial cells, making the brain the most
challenging part of the body due to its function. It coordinates many different activities and
tasks around the body, such as feeling emotion and coordinating limb movements, speaking,
walking, and forming memories. The brain can be split into four main sections: the temporal
lobe’s primary function is making memories, and giving things emotional meaning is also
used to interpret sound. The Occipital lobe Function is to create visual processes. The
parietal lobe Interprets sensory information, which may include navigation, spatial
awareness and touch. The frontal lobe is involved in planning and short-term memory and
voluntary movements, and the use of language.

The Spinal cord
The spinal cord covers the whole area of the back in length and is connected to the bringing
through the brainstem. Its primary function is transferring information from the central
nervous system to the peripheral nervous system via nerves. For example, sensory
information from the peripheral nervous system will travel through the spinal cord into the
brain. The motor neurones will carry them down through the central nervous system through
the spinal cord and into the body's tissues and muscles in this peripheral nervous system.
The spinal cord can also control involuntary movements such as reflex responses triggered
in dangerous situations involving involuntary movements such as walking.


Glial cells in the central nervous system
There are five main types within the central nervous system, Microglial Small cells, and their
primary function is to act as an immune system for the brain. They identify and attach
disease and injury inside the brain and respond much like the body's internal immune
system by removing pathogens and toxins and dead and damaged cells. If there is an injury
to the brain, they react by causing inflammation within the brain. Astrocytes are star-shaped,
and their primary function is to form a barrier between the brain and the outside and protect
from harmful substances entering the brain. These are the most common glial cells inside
the brain. They can use reuptake neurotransmitters and access potassium ions and dead
neurons. They can also store energy in glucose for neurons and help maintain the
metabolism inside the brain. This allows them also to regulate blood flow inside the brain.
Oligodendrocytes have a ball-like structure and have spikes off them that help wraps around
the axons and form a kind of myelin health. This helps speed up electrical impulses and
decreases the distance between the ions’ membranes to travel through. They also support
and provide energy to neurons. Ependymal cells these primary cells’ function is the line the
membrane that lines the ventricles inside the brain and spinal cord canal. They create spinal
fluid, and this fluid acts as a shock absorber and protection for the spinal cord are other
functions to remove waste and provide nutrients to the brain and spinal cord. They have cilia
attached to them which help waft the fluid around the spinal cord and brain, which keeps the
fluid within circulation. Radial glia stem cells often help develop cells inside the womb and
create new cells and neurons inside the brain.


Peripheral nervous system
The peripheral nervous system consists of the rest of the nervous system outside the brain.
The spinal cord and its main role and function are to connect the CNS to the rest of the body

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