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Summary OCR A Biology hormonal communication £6.99
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Summary OCR A Biology hormonal communication

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This document has everything you need to know about hormonal communication. The notes are concise and based of the mark schemes of previous years.

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  • May 16, 2023
  • 8
  • 2022/2023
  • Summary

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Types of glands


2 3



Endocrine Exocrine

secretes hormones produces digestive Nices
-
-




-directly
into
the blood -released into ducts which

-

ductless carries it another
to
place




Types of hormones




steroid
L



Peptide / lipid based hormone
-cannot pass through -can pass through the membrane


the membrane -Acts upon the but
in the nucleus

-
uses the fst/and messenger

model




firstmessenger,
~
second messenger response


(eg. Adrenaline)
Hormone has a complementary shape
Tr-hormone receptor site
to receptor. They bind ~>
a
Binding
cyclase
causes

be
to
the inactive

achue
adenyl
Zumbrane
Adenys cyclase (unaccel
AYCH cAMP
(secessenger)
3 carverts ATP ->

(AYCY)
which actuates ene

, ENGINEGLAND
-




The structure and function ofadvenal glands


Advenal gland ->
on top of the
hidney
Steroid hormone
~
structure Aldosterone -> ↓ [H20] in urine
7

↳water reabsorption

->
CAPSULE ↳ Control blood pressure
of
-
>zona
glomerulosa
secretesmineralocorticolds
->




controls levels of int], [Nat]
cortex zona fisciculata

>secretes
glucocort colds
↓


I
-




eg. Cortisol
medulla
functions -gluconeogenesis
2


zona reticularis glycogenolysis ↓
↓ ↓ conversion of AA

releases breaking ofglycogen and fats to
pre-cursor glucose
molecules for sex hormones

(Androgens)

Medulla


2


Adrenalme narachenaie
↑ Heart
rate

Stimulates glycogenolysis
flight or fight response

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