Summary
Summary Alevel OCR Biology A Notes on Communication and Homeostasis
Alevel OCR Biology A Notes on Communication and Homeostasis from an A* Biology student
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
FollowContent preview
communication + Homeostasis-
physical coune
systems maintain the internal environment within restricted limits.
of
-
ensure maintanance optimal condition for enzyme action cell function
+
-nervous system:CNS (braint spinal cord) + PNS (all verves a body
endocrine system:endocrine glands par of organism
-
release formoves into blood tream, transmit into from are to
another bring
to about a change.
-gland:group of cells that produce and releases are or more substance (secretions
-optimum pH hydogen =
and icric bands broken:
allers active site shape
-blood glucose b lood
conc=glue in alters water potential
+
availability of respiritory substrate
for all
temperature is
-
temp of tissue find around all it
s oo
high/low regatively
=
affect rate of enzyme contoced
reactions.
↳
Low temps prevent reactions/slow them down:Ifrequency of successful collision
↳
as temp continues 4,
to at
rate which an enzyme catalpes a reaction, denatles, bands break, tertiary
structure changes, permanately damaged active site
(transfers inco),
-
negative feedback loop receptor, coordination system elector.
-
↳
reduces initial elect a stimulus, uses two corrective rechariors
positive of original
-
feedback loop- enhance elect stimulus
-cell signalling:
allows multicellular organism to control + coordinate their bodies respond
+
to emiroment.
↳
stimulus recieved by receptor cel -> converted signal
to (transduction) -> transmitted target
to all leftector) response.
=
-animals:
paracrine signalling (culls close together)
+
endocrine signalling (cell for apart
-signalling molecules
vry
=
small-
easy transport across membrane
Thermoregulation:c or ner of
-
internal body temp
-Endotherms: count can body temp (hear generated in body tissues
-Ectotherms:b ehavioral adaptations:internal temp stay comerant (absab leal from environment
-Endotherms=peripheral receptors communicate
w/ hypothalamus
=cooking:vasodilation, sweating, flatter hairs
=heating:vasoconstriction, metabolic rate, slivering, erection of hairs
-Ectotherms:avoid extremes of temps, bask in sun/seen shade
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 lottiemcgowan1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £3.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75057 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