Movement is brought about my muscles controlling a Skelton

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Presentation transcript:

Movement is brought about my muscles controlling a Skelton But crabs don’t have bones!!

Structure of Muscles Skeletal muscle fibres are multinucleate and contain specialised endoplasmic reticulum Muscle fibres contain many myofibrils Each myofibril is made up of contractile sarcomeres

Structure of muscle fibres Muscles attached to bone = skeletal muscles (by tendons) stripes are visible Striated muscle

A muscle fiber is a cell. What is a muscle? This is what we are interested in The muscle cell/fiber

A muscle fiber. This is a single cell If you finish… What is myoglobin? Use your textbook to give a brief account of: Sarcolemma, Sarcoplasm, Mitochondria, Sarcoplasmic reticulum.

Components of a muscle fiber/cell Sarcolemma The cell membrane of the muscle cell Sarcoplasm The cytoplasm of the muscle cell Sarcoplasmic reticulum Specialised type of endoplasmic reticulum – stores calcium to be used in contraction Mitochondria Provide ATP for muscle contraction Myoglobin Similar to haemoglobin. Bonds to oxygen. Releases the oxygen when the muscle has insufficient oxygen for aerobic respiration

Myofibrils within the muscle cell

my The repeating unit in a myofibril is a sarcomere actin myosin Muscles look striped due to a series of light and dark bands The repeating unit in a myofibril is a sarcomere The Z-line appears at the centre of each light band

Syllabus: Draw a labelled diagram of a sarcomere Tips: Myosin must be shown with heads Actin should be connected to the Z lines Light bands should be labelled around the Z line The dark band should be indicated Label the sarcomere as extending from one Z line to the next

When muscle fibers contract, the myosin pulls the actin inwards, shortening the sarcomeres

Muscle contractions Thinner light bands Light bands closer together Light part in middle gone (M line)

Control of contraction Contraction of skeletal muscle occurs by the sliding of actin and myosin filaments Myosin filaments have heads that can bind to special sites on actin filaments, creating cross bridges.

Qs Muscle contraction