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labels show structure of sensory and Motor neuron.

Sensory neuron have a long dendrite that carries nerve impulses from receptor cells to the cell body and one short axon that carries nerve impulses from the cell body to the central nerve system.

Motor neuron have many short dendrites that carry nerve impulses from the central nerve system to the cell body and one long axon that carries nerve impulses from the cell body to effector cells.

This resource appears to be trustworthy because it uses diagrams form recommended books. It has a domain,  displays certifications.

Reference: Slideplayer(2016) Image sensory and motor neuron. [Online] http://slideplayer.com. [Accessed: 18/11/2018]

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label show the structure of a CNS

Central Nervous System comprises of the brain and the spinal cord, which are located in and protected by the vertebral column. It is referred to as central because it combines information from entire body and co-ordinates activity.

I trust this resource because it is a book that is recommended to use in biology studies and it has a domain name.

Reference: Wiley, J & Sons Singapore. (2013) Essentials of Anatomy and Physiology. 9th ed. Asia.

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Sensory and Motor neuron in  a reflex arc

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Sensory and Motor neuron in  a reflex arc

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Label show sensory and motor neuron in a reflex arc.

In a reflex arc motor neurons  carry messages from the CNS to the effector  that will carry out important tasks, includes organs, skeletal muscles, smooth muscles and glands.

In a reflex arc sensory neurons sends electrical impulses from the receptors to a relay neuron, which is located in the spinal cord of the central nervous system.

I trust this resource because it is an authorised book that is recommended to use in biology studies.

Reference: Wiley, J & Sons Singapore. (2013) Essentials of Anatomy and Physiology. 9th ed. Asia.

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Voluntary action

Initiated  by brain

effector is usually a skeletal muscle

slower as many components

May have some unconscious elements.

cross body, left brain/right body

Many possible sensory inputs

Reflex action

Initiated by sensory receptor

Most do not involve brain

Involuntary

Faster from stimulus to reaction.

I trust this source because it has a domain name and is used for different courses.

Reference:
Muliawam,C. (2015) IGCSE biology chapter 13 the nervous system. [Online] Available from: https://www.slideshare.net/clarissamuliawan/igcse-biology-chapter-13-the-nervous-system [Accessed: 18/11/2018].

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Label show the autonomic nervous system.

Autonomic nervous system is the branch of the peripheral nervous system that regulate the function of the internal organs for example heart and stomach, also controls the smooth muscles, cardiac muscles and glands. Makes involuntary adjustments to the body such as changing body temperature, sending extra blood to a particular area, change stomach secretions, slowing heart beat. Autonomic nervous system has two divisions namely sympathetic and parasympathetic.

Sympathetic nervous is there to stimulate organs to increase its activity. Fight response for example excitement, fear or stress.
Parasympathetic is responsible for maintaining body and conserving energy for later. The division is also responsible for digestion, defecation and urination.

The label is trustworthy because is has sufficient information.

Reference: Autonomic nervous system. [Online]. Available from:
https://de.fotolia.com/id/158279366 [Accessed: 19/11/2018]

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label show the structure of connector neuron.

Connector neurons are neural cells that form connection between neurons. They connect afferent neuron to afferent neuron through out the neural pathway in the body. They conduct communication signals between neurons by allowing neurons to communicate quickly. Connector neurons are found in the central nervous system. (Brain and Spinal Cord).

I trust the label because it is professionally done. And it has a domain name.

Reference:
Williams. J. (2018) Interneurons defination and structure. [Online] Available from: https://study.com/academy/lesson/interneurons-definition-function-quiz.html

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Mechanism of transmission of an impulse along a neuron

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Mechanism of transmission of an impulse along a neuron

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Video gives a clear explanation of the mechanism of an impulse along a neuron.

The transmission of a nerve impulse along a neuron from one end to the other take place as a result of electrical charges across the membrane of a neuron. The pump send sodium ions out of the cell and bring in irons, the process requires energy in the form of ATP The difference in charge inside and outside means that the neuron is polarized. Polarization is maintaining an excess sodium ions on the outside and excess potassium on the inside. Generation of action potential depends on the existence of a membrane potential presence of +voltage gated channels for Na+ and K+. Starting at time point 0.20 to 1.20 the video explains how resting membrane potential occurs and the opening of voltage gated channels due to  response to neurotransmitters in  potential membrane ,is referred to as depolarization. Before another potential action the axon become repolarised  this is achieved by closing the sodium channels and activating the potassium channels.

Between the neuron and the axon they is a gap know as the synapse, which the signal carried by the neuron must cross .High concentration of neurotransmitter acetylcholine is released into the synapse and bind the receptor triggering action potential in the neuron. The transmission is stored in vesicles near the pre-synaptic membrane. The depolarization of the membrane opens voltage gated calcium channels, which allow calcium from outside the cell to enter the cytosol. The concentration outside is 1000 times that inside, this causes the rise in internal polarity and as a result the synaptic vesicles will fuse with the plasma membrane.

The video appears  to be trustworthy because it is produced in a professional way.

Reference: McGraw-Hill (2017) Nerve Impulse [HD Amination] [Online video]. Available from: https://www.youtube.com/watch?v=8JTV3SfIK_8 [Accessed: 17/11/2018].