Summary
Summary Animal Responses and Muscle Contraction
- Institution
- OCR
This is the OCR A-Level biology topic covering animal responses
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re made up 2 types of filamentmy
pp
Myosin thick
E É
ÉiiÉiin
Each section where theseinteract are sarcmerest mitochond
Myband
f band Each sarcomere is Joined at the
Mtf 2 band disc
Etat
Thin filaments
The thin filaments are actin Eachunitconsists of two actin sub
units wound round a tropomyosin chain with globular troponin
molecules attached
innit
Troponin is a protien complex of 3 polypeptide chains One binds to
actin another binds to tropomyosin and another binds to lat when
available
Thick filaments
This is myosin consists of a bundle
of myosin molecules
Each molecule contains two bulbous heads which can bind to
sites on actin which are often covered by tropomyosin
thickmyosin
Diz heads
bulbous
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