A-Level Biology Specification

AQA 7402

Section 6.3: Skeletal muscles are stimulated to contract by nerves and act as effectors

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#6.3.1

Muscles act in antagonistic pairs against an incompressible skeleton.

#6.3.2

Gross and microscopic structure of skeletal muscle. The ultrastructure of a myofibril.

#6.3.3

The roles of actin, myosin, calcium ions and ATP in myofibril contraction.

#6.3.4

The roles of calcium ions and tropomyosin in the cycle of actinomyosin bridge formation. (The role of troponin is not required.)

#6.3.5

The roles of ATP and phosphocreatine in muscle contraction.

#6.3.6

The structure, location and general properties of slow and fast skeletal muscle fibres.