Exam (elaborations)
2024 AQA A LEVEL BIOLOGY CHAPTER 14 EXAM WITH CORRECT ANSWERS
- Course
- Institution
2024 AQA A LEVEL BIOLOGY CHAPTER 14 EXAM WITH CORRECT ANSWERS
[Show more]
Content preview
2024 AQA A LEVEL BIOLOGYCHAPTER 14 EXAM WITH CORRECT
ANSWERS
What is taxis? - CORRECT-ANSWERSa simple response whose direction is
determined by the direction of the stimulus. It can be positive or negative
taxis
Why do organisms respond to stimulus? - CORRECT-ANSWERSto increase
their chances of survival
Which branch of the ANS is responsible for fight or flight response? -
CORRECT-ANSWERSthe sympathetic branch (think sympathy is going to help
you)
Name the three types of neuron and their function in the relex arc -
CORRECT-ANSWERSsensory - carries impulses from the receptors towards
the CNS
intermediate neuron - links the sensory neuron to the motor neuron in the
spinal cord
motor neuron - carries nerve impulses from the spinal cord to the effectors
What is a pacinian corpuscle - CORRECT-ANSWERSThey're mechanorecptors
which detect mechanical stimuli eg pressure
-theyre found at the end of sensory nerve and wrap it in layers of lamellae
-when stimulated the stretch-mediated sodium ion channel is deformed
-sodium floods into cell and creates a generator potential
- if it reaches the treshold a action potential will be fired
How is light converted into electrical impulses? - CORRECT-ANSWERS1) light
enters the eye, hits the photoreceptors and is absorbed by light sensitive
optical pigments
2) the pigment is bleached, causes a chemical change that alterr membran
perm for sodium
3) a generator potential is created
4) sent along a bipolar neurone, connecting photoreceptors to optic nerve
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Elitaa. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83637 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now