Cell Signaling and Movement PDF - Brunel University London 2024

Introduction to Medical Sciences 1 Cell Signalling and Movement Comparative features of skeletal, cardiac, and smooth muscle Copyright © Brunel University London v.3 2024. All rights reserved. Cell Signalling and Movement Dr Julianna Gal Version 3 2024...

Introduction to Medical Sciences 1 Cell Signalling and Movement Comparative features of skeletal, cardiac, and smooth muscle Copyright © Brunel University London v.3 2024. All rights reserved. Cell Signalling and Movement Dr Julianna Gal Version 3 2024 Copyright © Brunel University London v.3 2024. All rights reserved.  Some key features of Part of a skeletal muscle muscle fibre (muscle cell) Long multinucleate cells, with obvious striations Nuclei Attached to bones or skin Under voluntary control Functions in locomotion, Striations facial expressions, and manipulation of environment Copyright © Brunel University London V.3 2024. All rights reserved.  Organisation of skeletal muscle Muscle One motor neuron PLUS fascicle all of the skeletal muscle fibres that it innervates is called a motor unit Skeletal muscles display wide range of contractile force and velocity Copyright © Brunel University London V.3 2024. All rights reserved.  Some key features of cardiac muscle Intercalated discs Branching, striated, typically uninucleate cells; interdigitate at specialised junctions Striations (intercalated discs) Involuntary control Makes up walls of heart and Nucleus functions to propel blood into the circulation Copyright © Brunel University London V.3 2024. All rights reserved.  Organisation of cardiac muscle within the heart Cells are interconnected and electrical stimulation from pace- maker spreads throughout each chamber This ensures coordinated force generation and internal pressure increase Copyright © Brunel University London V.3 2024. All rights reserved.  Some key features of smooth muscle Nuclei Spindle-shaped cells with Central nuclei No striations Close arrangement of cells typically form sheets Most abundant in walls of hollow organs Smooth muscle Involuntary control cell Propels substances or objects along internal passage ways Copyright © Brunel University London V.3 2024. All rights reserved. Coordination of smooth muscle cells Copyright © Brunel University London V.3 2024. All rights reserved. Dr Julianna Gal Copyright © Brunel University London V.3 2024. All rights reserved.