MYTUTOR SUBJECT ANSWERS

266 views

Describe the 'reflex arc'

The relfex arc is an innate response designed to keep us safe (this means we do not consiously think about doing it). One of the most common examples for this question is a person touching a hot flame and immediately withdrawing their hand to prevent damage (burning). The main stages in the reflex arc are as follows:

1.   The sensory receptors detect the stimulus (Nerves in your fingers will detect the heat of the flame)

2.   The sensory neurone passes this 'message' on via the relay neurone to the spinal cord in the central nervous system

3.   The 'message' is then passed from the spinal cord to a motor neurone

4.   This motor neurone sends the 'message' to an effector (in this example the effector may be a muscle which contracts to remove the finger from the flame)

Every time the 'message' is passed between neurones or the spinal cord, it is passes on via a synapse. A synapse works like this:

1.   A 'message' comes to the end of a neurone

2.   It causes a chemical called a neurone transmitter (usually acetylcholine) to be released into the gap between the end of the first neurone and the start of the next.

3.   Thhis chemical diffuses accross the gap to the next neurone. It binds to receptors on the surface and continues the 'message'.

Lauren R. GCSE Biology tutor, A Level Biology tutor, GCSE Maths tutor...

8 months ago

Answered by Lauren, a GCSE Biology tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

179 SUBJECT SPECIALISTS

£22 /hr

Roslyn I.

Degree: Anthropology with International Relations (Bachelors) - Exeter University

Subjects offered: Biology, Extended Project Qualification+ 2 more

Biology
Extended Project Qualification
English
-Personal Statements-

“My name is Roslyn Irving and I am currently studying for a degree in Anthropology and International Relations. Having taken Science A-levels as well as English I am in a good position to ”

£18 /hr

Gabriella O.

Degree: Law (Bachelors) - Durham University

Subjects offered: Biology, Maths+ 3 more

Biology
Maths
Chemistry
.LNAT.
-Personal Statements-

“I am Gabriella and I am a 3rd year law student at Durham University. I love learning and would like to share this passion with you. I believe it important for everyone to achieve their best. Although I am studying law I took maths and ...”

£18 /hr

Paulina W.

Degree: International Relations (Bachelors) - Exeter University

Subjects offered: Biology, Spanish+ 1 more

Biology
Spanish
History

“About me I am a 2016 IB Diploma Programme alumni and first year International Relations student at the University of Exeter.I am very passionate about subjects I am teaching and I hope to pass some of my love for them to you. I a...”

About the author

Lauren R.

Currently unavailable: for regular students

Degree: Zoology (With study year abroad) (Bachelors) - Exeter University

Subjects offered: Biology, Maths+ 3 more

Biology
Maths
ICT
Geography
Chemistry

“About me... I am a zoology student at the University of Exeter. From a young age I've had a love for maths and science and I hope that my tutorials may help to cutlivate your passion too! I have tutoured numerous students for a year ...”

MyTutor guarantee

You may also like...

Other GCSE Biology questions

One form of muscle disease is caused by a mutant myosin allele. It prevents myosin from binding to other myosin molecules, thus preventing contraction. Suggest why.

What is the difference between cells, tissues, organs and organ systems?

What is an allele?

What are the differences between the nervous and endocrine systems in maintaining homeostasis?

View GCSE Biology tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok