ANP 1105 Lecture 5: (2) Chapter 1.6 Muscle Tissues

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Jacqueline Carnegie

Document Summary

These are the voluntary muscles allowing us to move different parts of our body. The largest of the 3 types of cells. A muscle fibre is a single muscle cell. They tire very easily and must rest. They are strong and adaptable and can improve. All the hollow visceral organs (urinary system,) Pacemaker (made up of muscle cell) sets rate of contraction; neural input can increase rate. Muscle contraction depends on actin and myosin myofilaments. Functions of the muscles: generate movement (blood flow, pressure, respiration, maintain posture: constantly working against gravity, stabilize joints (shoulders knees, generate heat: maintains body temperature. Functional characteristics of muscle: excitability (irritability): can be electrically stimulated by neurotransmitters or hormones, contractility: ability to shorten forcibly when adequately stimulated, extensibility, elasticity. Syncytium huge cells that have many nucleotides in them. Happens during cell replication where it did not divide the cell properly. Sarcoplasm contains lots of glycogen and myoglobin (oxygen binding protein found in muscle tissues)