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Summary Eyes, muscles and heart contraction a level notes £3.48   Add to cart

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Summary Eyes, muscles and heart contraction a level notes

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These notes helped me get into medical school, I completed my a levels at Guildford high school which consistently ranks among the top schools in the UK and is known for their academic rigour. I made these notes as a summary of the power points that we were taught off of.

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  • August 25, 2024
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  • 2024/2025
  • Summary
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anastazjaohearn
tropomyosin

7
A band
rod cells come cells Iband I band




brain
myosin thick filaments
-
black-white -
Trichromatic - -

IIII
numerous ↳ red , green , blue -

·

t
-




IIII
-
retinal conc & forea
convergencee
-




IIII IIII
-
.




N



for low
light
-


high light intensity ↓
Zline It zone Zline
myosin crossbridge
-
low visual acuity
-


iodopsin Actin thin filaments


-

rhodopSin Sarcomere



+
Ca2 released




T
from sarcoplasmic reticulum
·




·
Ca't binds to tropomyosin
-

Sinoatrial mode generates a wave of excitation
Sinoatrial node
·

change in 30 structure moving tropomyosin




*
-
Wave spreads down the atrial walls (atrial systole
Atrioventricular away from myosin binding site on actin

Activity picked up at atrioventricular node
-




node head (with ADP) binds to act in
myosin
·




- Bundle-slight delay allowing blood into
~ the ventricles

forming actinmyosin cross-bridge




·
of His -wave spread down bundle of His /made up of Purkyne fibres
actin ADP released
angle change pulling
·




L
,
-V to the apex of ventricles


.
Purky ne

r ~ New ATP attaches breaking cross-bridge
↑ V
vv fibers -

wave travels up the walls of the ventricles from the apex

>
·
can t activates ATP
hydrolase moving it back
r
them to contract simultaneously
Tr causing to the original position

·
wave of excitation cannot pass directly to ventricles due to
non-conducting tissue layer -
-
Do ·
ADP
> > ADD

sympathetic/accelerator
Pi
nerve heart rate controlled T


&
Fe
- -
parasympathetic/ragus nerve by medulla
oblongata
,
- -




+
-
& can be stimulated

1
2
by chemical and &
- -
&S
& ~ -
D
r


-
So~ pressure receptors :
·
ADD
ATD L
Pi [ T


- -
- -

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