MUSCULAR SYSTEM I pp. 917-920.

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Presentation transcript:

MUSCULAR SYSTEM I pp. 917-920

FUNCTION Support, movement, and protection

TYPES skeletal – muscles that move bones (voluntary) smooth – involuntary muscles that protect organs cardiac – involuntary muscles found only in heart

MUSCLE STRUCTURE myofibril muscle cell (fiber)fascicle muscle

Two types of proteins (actin and myosin) involved actin + myosin  myofibril myofibril attaches to Z line sarcomere: functional unit from Z line to Z line

MUSCLE CONTRACTION

contraction: shortening of sarcomere between Z –lines myosin “heads” walk along the actin this requires ATP to walk and to release the myosin after walking

ENERGY Aerobic respiration: breaking down organic compounds to release energy to be used by the body OCCURS: 1. when oxygen is present 2. in the mitochondria PRODUCES: ATP

MUSCLE FATIGUE The inability to contract the muscle due to the lack of ATP a contraction occurs when “heads” walk along the actin The walking requires ATP to contract and release the muscle

Look at p 929 #7. Define parts of picture 1-4. Read 917-920 Do problems p 922 # 1-4, 9, 10 Look at p 929 #7. Define parts of picture 1-4. Is this muscle elongated or contracted?