Part B: Nervous system function (17 marks) Jenny had surgery to set her broken bone; this was done under general anaesthesia.
The
the
with unlabelled graph of
action potential
phases has been
provided to assist
your answers 1. When nerve cells are at rest, there is a resting membrane potential (RMP; phase #1 on
graph) for the neuron cell membrane. Describe how the RMP is generated. (3 marks)
2. Jenny is conscious and alert when certain neurons in her brain are active. Her neurons
depolarise, produce action potentials, repolarise and hyperpolarise. Define depolarization
and hyperpolarization and explain their relationship to threshold. (3 marks). 3. Jenny’s nerve cell membranes have both leak (passive) potassium channels and voltagegated potassium channels. Explain how these channels differ, in terms of where in the cell
they are located and in how they work. (3 marks) 4. Anaesthesia to be used for Jenny’s procedure will affect her neurons for consciousness
and sensation of pain. The anaesthetic acts by opening more potassium leak (passive)
channels. How does this make Jenny’s neurons less likely to produce the action potentials
that would normally keep her awake and experience pain? (3 marks)
5. Skeletal muscle has similar types of potassium leak (passive) channels that react with the
general anaesthesia. What might be the effect on Jenny’s skeletal muscle contraction
during surgery? Explain. (2 marks) 6. Prior to surgery, Jenny’s pre-op blood testing revealed hyperkalaemia (indicated high
levels of extracellular potassium. What effect would elevated extracellular potassium
have on muscle and nerves cells? (3 marks) Part C:General questions on Nervous System Function (6.5 marks)
1. In terms of nerve communication,
a. Why might a patient experience sensations of tingling and numbness in their
lips/tongue/face/neck? Suggest possible steps in nerve transmission that may be affected (3
marks) b. Suggest likely affected peripheral nerves that may cause paralysis in the face and mouth;
Justify your choice. (3.5 marks)

• 1494640225-Part B.docx

SuperTutor

(15)

Status NEW Posted 13 May 2017 01:05 AM My Price 9.00

-----------

Attachments

file 1494640226-Solutions file.docx preview (51 words )

S-----------olu-----------tio-----------ns -----------fil-----------e -----------Hel-----------lo -----------Sir-----------/Ma-----------dam----------- T-----------han-----------k y-----------ou -----------for----------- yo-----------ur -----------int-----------ere-----------st -----------and----------- bu-----------yin-----------g m-----------y p-----------ost-----------ed -----------sol-----------uti-----------on.----------- Pl-----------eas-----------e p-----------ing----------- me----------- on----------- ch-----------at -----------I a-----------m o-----------nli-----------ne -----------or -----------inb-----------ox -----------me -----------a m-----------ess-----------age----------- I -----------wil-----------l b-----------e q-----------uic-----------kly----------- on-----------lin-----------e a-----------nd -----------giv-----------e y-----------ou -----------exa-----------ct -----------fil-----------e a-----------nd -----------the----------- sa-----------me -----------fil-----------e i-----------s a-----------lso----------- se-----------nt -----------to -----------you-----------r e-----------mai-----------l t-----------hat----------- is----------- re-----------gis-----------ter-----------ed -----------onÂ----------- th-----------is -----------web-----------sit-----------e -----------Tha-----------nk -----------you----------- -----------

Not Rated(0)

• Buy Answer