Autonomic Nervous System Flashcards

1
Q

What kind of receptors are there at the neuromuscular junction?

A

Nicotinic receptors

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2
Q

How many different types of neurotransmitter are there in the somatic nervous system and what are they?

A

One- acetycholine

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3
Q

What is the purpose of the autonomic nervous system?

A

To ensure survival through maintenance of homeostasis and regulation of responses to changes in the environment.

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4
Q

Which branch of the nervous system is responsible for lens accomodation in the eye?

A

The autonomic nervous system.

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5
Q

Are there synapses in the autonomic system and why?

A

No, because the ANS needs to communicate with a large number of cells at once.

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6
Q

Are there ionotropic receptors in the ANS?

A

No, only metabotropic

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7
Q

What kind of receptors are there in the ANS; ionotropic or metabotropic?

A

Metabotropic.

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8
Q

The ANS controls the function of all organs in the body except…

A

The brain and skeletal muscle.

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9
Q

If the organs that are under control of the ANS are disconnected from neuron, can they continue to function?

A

Yes, they are connected to the ANS only to be regulated.

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10
Q

How many exit points are there for the parasympathetic nervous system?

A

Two, one is responsible for the urinary system, the male reproductive tract and the rectum. The other comes out straight from the hind brain and is responsible for all other organs.

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11
Q

How many exit points from the brain are there for the sympathetic nervous system?

A

One

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12
Q

In the ANS are the post-ganglionic neurons and pre-ganglionic neurons myelinated?

A

The pre-ganglionic neurons are myelinated and the post ganglionic neurons are not.

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13
Q

What are four major components of the ANS?

A
  • Sensory afferent components
  • Integrating centres (e.g. brain)
  • Motor efferent components
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14
Q

What are the relative lengths of the post-ganglionic and the pre-ganglionic neurons in the parasympathetic nervous system?

A

Long pre-ganglionic neuron and short post-ganglionic neuron.

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15
Q

How is communication between neurons and target tissues different in the somatic and the autonomic nervous systems?

A

The communication is less discrete in the ANS as there are not 1:1 synaptic connections in the ANS. There are in the SNS.

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16
Q

Receptors of which nervous system are present on blood vessels?

A

Sympathetic nervous system only.

17
Q

Which noradrenaline receptors cause relaxation?

A

Beta receptors

18
Q

Which noradrenaline receptors cause contraction?

A

Alpha 1 receptors.

19
Q

During the fight-flight response noradrenaline is released. How is redistribution of blood from achieve if only one neurotransmitter is used?

A

Different types of receptors ‘hooked’ to different secondary messengers
Alpha 1- constriction
Beta- relaxation

20
Q

Is NO lipid or water soluble?

A

Lipid soluble

21
Q

Which neurotransmitter is synthesised on demand and not stored in vesicles?

A

Nitric oxide

22
Q

Which amino acid is a precursor of NO?

A

L-Argenine

23
Q

Is NO cause contraction or relaxation of smooth muscle?

A

Relaxation- inhibitor of smooth muscle contraction