Function of Muscles

Characteristics of Muscles pg 179 3 types: muscle cell = muscle fiber All muscles share some terminology Prefix myo refers to muscle Prefix mys refers to muscle Prefix sarco refers to flesh

1. Smooth Muscle 2. Cardiac Muscle 3. Skeletal Muscle Figure 6.2a

Quick Write Smooth Skeletal Cardiac Fill in table distinguishing between the 3 muscle types: Smooth Skeletal Cardiac

Connective Tissue Wrappings of Skeletal Muscle Endomysium – Perimysium – Epimysium – Figure 6.1

Skeletal Muscle Attachments Muscle attachment sites: Cartilage- Tendon – Aponeurosis –

Microscopic Anatomy of Skeletal Muscle 2 slides Cells are multinucleate Nuclei are beneath the sarcolemma Figure 6.3a

Myofibril Bundles of myofilaments I band = light band Z disc at midline Actin only A band = dark band Actin and Myosin H zone/Bare Zone at midpoint Lacks actin Figure 6.3b

Microscopic Anatomy of Skeletal Muscle Sarcomere: Contractile unit (Z disc to Z disc) Figure 6.3b

Microscopic Anatomy of Skeletal Muscle Organization of the sarcomere: Thick filaments = myosin filaments (protein) Thin filaments = actin filaments (protein) Figure 6.3c

Microscopic Anatomy of Skeletal Muscle (good)(2 slides) Myosin heads pull Myosin and actin overlap Figure 6.3d

Microscopic Anatomy of Skeletal Muscle Sarcoplasmic reticulum (SR) – for storage of calcium Figure 6.3d

McGraw Review Video

Modeling A Sarcomere w/Clay Make a sarcomere and label on a piece of paper Myosin Actin Z disc I band A band H zone

Draw a Sarcomere Label: Z disc, H zone, A band, I band, M line, actin and myosin

So now we know the microscopic anatomy of muscle cell…… So now we know the microscopic anatomy of muscle cell…….so what you may ask?? Who cares??? It will help us understand the ____________

Muscle Cell Contraction Review website Prezi: Neurotransmitter released into synaptic cleft