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Exam (elaborations)

15 Control and coordination (diagrams, key points, summary)

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  • Course
  • Biology (9700)
  • Institution
  • Gcse
  • Book
  • Cambridge International AS and A Level Biology Coursebook with CD-ROM

Scored an A* | A Level Biology notes with contents arranged according to the learner guide. Contains diagrams, easily understood by visual learners. Consists of key points, not too further elaborated, short, concise and straight to the point to equip you for the exam.

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Document information

  • August 27, 2020
  • 19
  • 2019/2020
  • Exam (elaborations)
  • Only questions

Subjects

  • a level
  • biology
  • control and coordination
  • gcse
  • cie
  • nerves
  • nervous system

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Content preview

Control 7 Coordination
CIE A LEVEL BIOLOGY




Jia Xuan
by

,MAMMALS
NERVOUS VS ENDOCRINE SYSTEM




÷÷÷÷¥÷÷: i÷÷÷÷÷i÷
T




.fi/::::/
NERVOUS SYSTEM ENDOCRINE SYSTEM
-




both involve signalling
cell
signalling cell


detail both involve
signal molecule binding to receptor

chemicals both involve chemicals




response destination muscle l gland target organs 1 tissue 1 cells


transmission speed fast slow


effects specific / localised can be widespread

fast slow
response speed

\ duration I shor t -
lived
) long -
lasting I

\ ) ) )
receptor locator on cell sur face membrane on CSM / within cell



#




ACTION POTENTIAL


membrane

potential 1mV
^




ta
C
+ 30 -



T




.




-

70 ↳ E
F-



- time 1ms




A. F :
resting potential

B : de polarisation

D : re polarisation


E :
hyperpolarisation

, RESTING POTENTIAL




÷:÷÷÷÷: iii.
'




-
.




sodium 3 Nat and 2kt
I . -

potassium pump pumps out of neurone into neurone
by active


transport , against concentration gradient
membrane of to Kt
2 . neurone more
permeable
3 .
more Kt diffuse out than Nat diffuse in by facilitated diffusion

4- inside more negative than outside

5 . membrane is polarised t
I I I I
.




i. : : : :

is 60 to 70 mV
G resting potential
- -
.




D ion movement only at Nodes of Ranier




DE POLARISATION


't
Na



'




.




I Nat channels open
.




2 . Nat diffuse into the cell

3 .

potential across the membrane changes
than
4 . inside more
positive outside

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