Summary
OCR A-Level Biology Coordination(2) Summary
Handwritten Notes detailing all the necessary A* content for Coordination in OCR A-Level Biology.
[Show more]
Seller
Follow
Content preview
chemoreceptors Detect chemical change :ie .
PH
↳ Carotid and medulla
the aorta ,
artery
in
Baro receptors Detect blood pressure
changes in
:
↳ in the aorta and carotid
artery
Parasympathetic neurones :
Secrete acetylcholine
s binds to SAN to reduce impulses sent to
the heart heat rate decreases
Secrete noradrenaline binds to SAN
Sympathetic to
-
neurones :
increase impulses sent to
the heart sheart rate increases
Cardiac Muscle
faintly striated involuntary contract at an intermediate speed myogenic
:
, , ,
Joined
by intercalated disks sallow electrical transmission
-
fibers are mi-nucleated
Involuntary Non-stricted contract/fatigue
involuntary no regular arrangement
muscle :
, , , slow to
Fibers are
spindle shaped
·
uni-nucleated
Neurogenic ,
stricted Stricted
voluntary regularly arranged contract/fatigue
Skeletal muscle
:
, , , quick to
-
Fibers are tubular and multinucleated
Skeletal muscles formed from bundles of fibers membrace
·
are Muscle in a Sarcolemma
formed from individual
fusing together
a
muscle ceus
very strong
·
·
Parts of the Sarcolemma fold inwards (transverse tubules) to
spread electrical imprises
·
Sarcoplasm contains lots of mitochondria and sarcoplasmic refictum and calcium ions
energy
Myofibrils Long cylindrical organelles made of protein filaments
:
·
Actin :
Thin filament -> two twisted strands
↳
Tropomyosin protein blocks actin-myosin binding sites
Troponin proteins bond to actin tropomyosin and calcium ions
·
,
myosin This filament long rod-shaped fibers
:
↳ have bind and A TP
hinged globular heads to to actin
↳ Can move backwards and forwards
light bands Areas where actin and myosin do not overlap (I-bands)
:
Dark bands :
Areas where actin and myosin overlap (A-bands)
H-zone :
lighter area within the dau band as
only myosin is present
z-line line between
light bands/individual sarcomeres
:
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 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 faithcortis. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
64438 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now