Skeletal & Muscular systems

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Presentation transcript:

Skeletal & Muscular systems Notes are Yours Today: Jot down this list of important terms, and make sure they make it into your notes during the lesson: Tendon Ligament Osteon Bone Marrow Skeletal Muscle Smooth Muscle Cardiac Muscle Myofibril Sarcomere Actin / Myosin

Skeletal & Muscular System

Connective Tissues of the Skeletal System Bones Rigid matrix of calcium and phosphate with cells embedded. Provide support and structure and allow locomotion Homeostasis of calcium levels Marrow inside contains blood stem cells Cartilage Flexible, cushions joints. Sharks and rays (cartilagenous fish) have cartilage skeletons

Osteon: Tissue Units of Hard Bone

Cells of the Osteon

Bone Marrow: Where blood cells of all types come from

Three Types of Muscle Tissue Skeletal muscle (aka “striated”): voluntary. Attaches to bone Smooth muscle: involuntary (i.e. peristalsis) Cardiac muscle: heart.

From Muscle Cell to Muscle This whole structure is a muscle cell, or “myofibril” Myofibrils are polynucleated

Muscle Contraction Ca++ ions produced by motor neuron cause myosin filament to pull on actin filaments, drawing them inward. Extensor v. flexor