NATS 1610 Lecture Notes - Lecture 12: Red Blood Cell, Cardiac Muscle, Blood Plasma
17 Dec 2015
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Document Summary
Central canals have blood vessels passing through. Canaliculi (small canals) connect cells in neighbouring lacuna. Cells floating in a fluid matrix: blood (plasma) Matrix - fluid - blood plasma: fibres absent, dissolved proteins. Cells & cell fragments: red blood cells (erythrocytes) Transport o2 and co2: white blood cells (leukocytes) Defense against infection & other diseases: platelets (involved in clotting) L12- from cells to tissue to body . Muscular tissue is composed of cells called muscle fibres: contractile. Forcefully shorten in response to external stimulation then relax & passively lengthen. Muscle fibres contain protein filaments: actin (thin) & myosin (thick, these are the main contractile filaments proteins that enable muscle contraction arrays. Muscle fibres are arranged in parallel: layers of muscles and muscular organs contract in a coordinated way. Elastic can return to their original length after being shortened or lengthened. Occur in muscles attached to bones: cardiac. Occur in the wall of the heart: muscle cells called muscle fibres.
