Posts Tagged ‘nervous system’

Nervous system

Monday, October 10th, 2011

Neurons in the brain - illustration by Rebecca-Lee on flickr

Some of the questions we’ll be tackling in the next section of the syllabus (6.5) are:

Do you know what the CNS and PNS are?

Can you explain what role receptorssensory neurons, relay neurons,motor neurons and effectors play in conducting nerve impulses?

Can you draw and label a diagram of a motor neuron?

Can you define resting and action potentials?

Can you explain how nerve impulses pass along a neuron?

Can you explain how impulses travel from one neuron to the next?

Read through your textbook pages 240-246 to get a head start on this unit 🙂

And once again, a great presentation from Mr Stephen Taylor in Bandung to help you learn this stuff!

In class we will use this presentation – Nervous System

There are some useful animations here, and here that might help you visualize what’s happening.

Here is the lab we will do on reaction times:  Grade 12 IB HL Biology Reaction times lab

The human brain and pain

Thursday, February 25th, 2010
fMRI by nats on flickr

fMRI by nats on flickr

This next section, E5, is all about the human brain, brain function, fMRI, sympathetic and parasympathetic nervous systems, pupil reflex, brain death, and the perception of pain.  Phew!  That’s a lot of concepts. 

We’ll again use click4biology as a good resource, and this presentation from Mr Taylor in Bandung to help us get through it all.  Here are the key questions we need to answer:

  • What are the major parts of the human brain, and what are their functions?
  • How do animal experiments, lesions and fMRI scanning used in identifying which part of the brain is involved with specific functions?
  • How are heart rate, movements of the iris, and blood flow to the gut controlled by the sympathetic and parasympathetic nervous systems?
  • What is the pupil reflex and how is it used to determine brain death?
  • How is pain perceived and how to endorphins help to alleviate it?

This is also a very useful set of notes, courtesy of Mr Hobbins. Topic E5 The Brain

Neurotransmitters and synapses

Friday, February 12th, 2010
addiction by alancleaver_2000 on flickr

addiction by alancleaver_2000 on flickr

Here are the big questions for us to tackle in this section:

  • How does decision-making occur in the CNS?
  • How do psychoactive drugs affect the brain and personality?
  • What the physiological effects of THC and cocaine?
  • What are the causes of addiction?

We’ll use this presentation from Mr Taylor.  And, as usual, click4biology is a great resource.  Also, for fun, check out this site.  You’ll find some very entertaining mice!

Thanks to Mr Hobbins for this powerpoint. E4 Neurotransmitters and Synapses

Stimulus and response

Friday, February 5th, 2010

The syllabus guide for this topic: Option E – syllabus guide

We are starting option E with a look at the nervous system.  Check out this excellent presentation from Mr Taylor.

What are some examples of reflexes that exist in humans?  Are there some that exist in babies but not in adults?  Do other animals have reflexes that we don’t have?  Do plants have reflexes?  What is the purpose of a reflex action? 


Last test of semester 1 – hooray!

Monday, November 16th, 2009
calendar card - January by Joe Lanman on flickr

calendar card - January by Joe Lanman on flickr

Our calendar is jammed, so we can’t be very flexible with dates for this test.

B Block – THURSDAY 3rd DECEMBER

G Block – THURSDAY 3rd DECEMBER

F Block – FRIDAY 4th DECEMBER

(Caitlin and Synnove – we will make arrangements for you to sit it during your study halls on THURSDAY 3rd due to clash with English Orals)

Topics covered will be Nervous System, Endocrine System, Reproductive System – and for HL students Muscles and Movement as well.  That is Topics 6.5 and 6.6 for SL, and Topics 6.5, 6.6 and 11.2 for HL. Come to tutorials armed with questions if you need to 🙂

Reaction times

Thursday, November 5th, 2009
ReactionTimeStepTwo

ReactionTimeStepTwo from www.csiro.au

This next lab looks at measuring reaction times.  There are several ways we could do this, but we are going to keep it simple and use the old, tried and tested method of catching a ruler.  Here’s what to do:-

  1. Find a partner.
  2. One person rests their elbow on a table with their hand extended over the edge.
  3. The partner should hold a meter ruler between the subject’s thumb and forefinger, ensuring it is at the 0cm mark.
  4. As soon as the ruler is released, the subject must try and catch it.  The distance the ruler falls can be used as a measure of reaction time.
  5. You will need to repeat this a suitable number of times to ensure the reliability of your data.
  6. Try investigating different variables, such as left-hand vs right-hand, using one eye or two eyes, sound or touch stimuli instead of sight.  THINK ABOUT CONTROL OF VARIABLES – it is very important here.
  7. Record your data in a suitable way, process it and present it appropriately.  Draw relevant conclusions.  Evaluate your results and the procedure used.  Suggest realistic improvements.

This lab will assessed for data collection and processing, and for conclusion and evaluation.

 

 

       

Data Collection and Processing (DCP)

 

Recording raw data

 

Processing raw data

Presenting processed data

 

c = 2

Records appropriate quantitative and associated qualitative raw data, including units and uncertainties where relevant. Processes the quantitative raw data correctly. Presents processed data appropriately and, where relevant, includes errors and uncertainties.

p = 1

Records appropriate quantitative and associated qualitative raw data, but with some mistakes or omissions. Processes quantitative raw data, but with some mistakes and/or omissions. Presents processed data appropriately, but with some mistakes and/or omissions.

n = 0

Does not record any appropriate quantitative raw data or raw data is incomprehensible. No processing of quantitative raw data is carried out or major mistakes are made in processing. Presents processed data inappropriately or incomprehensibly.

 

 

       

Conclusion and Evaluation (CE)

 

Concluding

Evaluating procedure(s)

Improving the investigation

 

c = 2

States a conclusion, with justification, based on a reasonable interpretation of the data. Evaluates weaknesses and limitations. Suggests realistic improvements in respect of identified weaknesses and limitations.

p = 1

States a conclusion based on a reasonable interpretation of the data. Identifies some weaknesses and limitations, but the evaluation is weak or missing. Suggests only superficial improvements.

n = 0

States no conclusion or the conclusion is based on an unreasonable interpretation of the data. Identifies irrelevant weaknesses and limitations. Suggests unrealistic improvements.

 DUE DATE:  Tuesday 17th November

Nervous system

Thursday, October 22nd, 2009
neurons from www.images.wellcome.co.uk

neurons from www.images.wellcome.co.uk

Some of the questions we’ll be tackling in the next section of the syllabus (6.5) are:

Do you know what the CNS and PNS are? 

Can you explain what role receptors, sensory neurons, relay neurons, motor neurons and effectors play in conducting nerve impulses?

Can you draw and label a diagram of a motor neuron?

Can you define resting and action potentials?

Can you explain how nerve impulses pass along a neuron?

Can you explain how impulses travel from one neuron to the next?

Read through your textbook pages 240-246 to get a head start on this unit over the break 🙂

And once again, a great presentation from Mr Stephen Taylor in Bandung to help you learn this stuff!

In class we will use this presentation – Nervous System

There are some useful animations here,  here and here that might help you visualize what’s happening.