Control of Blood Flow and Blood Pressure ( Lectures 3b and 4). CONTROL OF BLOOD FLOW. 1) REASON: Body needs different levels of nutrient delivery and metabolic removal for differing levels of activities High Activity High blood Flow Low Activity Low Blood Flow
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Smooth Muscle. Spindle-shaped cells 2-10 m across & ~100 m long Have a thin endomysium Organized into longitudinal and circular layers Found in walls of contractile organs (except the heart). Innervation of Smooth Muscle. Lacks neuromuscular junctions
Smooth muscle. Smooth Muscle. A. fusiform fibers B. centrally located nucleus Few mitochondria . Z-lines are replaced by dense bodies. Sustained contraction. Single unit and multiunit smooth muscles. Smooth muscles are nonstriated and involuntary muscles.
Smooth Muscle. Smooth muscle surrounds the major hollow organs - including: blood vessels, bronchi, gut, uterus, bladder. Diverse Functions. Responsive to a variety of stimuli: neural input (autonomic and enteric nervous systems) broad array of hormones and drugs metabolites.
SMOOTH MUSCLE. Dr. Ayisha Qureshi MBBS, MPhil Assistant Professor. Structure of smooth muscle. STRUCTURE OF SMOOTH MUSCLE. Shape of muscle fiber: - spindle shaped - 1-5 µm in diameter - 20-500 µm in length
SMOOTH MUSCLE . Dr. Ayisha Qureshi MBBS, MPhil Assistant Professor. CLASSIFICATION OF SMOOTH MUSCLES. UNITARY/ SINGLE UNIT/SYNCYTIAL/VISCERAL Muscles of visceral organs .e.g. GIT, uterus, ureters & some of the smaller blood vessels. Form a sheet or bundles of tissue.
SMOOTH MUSCLE. Dr. Ayisha Qureshi MBBS, MPhil Assistant Professor. Structure of smooth muscle. STRUCTURE OF SMOOTH MUSCLE. Shape of muscle fiber: - spindle shaped - 1-5 µm in diameter - 20-500 µm in length
Smooth Muscle. Prof. K. Sivapalan. Smooth Muscle. Found in the internal organs Usually 1 to 5 µ in diameter and only 20 to 500 µ in length Myosin and actin filaments cause contraction but the arrangement is different. Smooth M uscle Types.
Smooth Muscle. Characteristics Not striated Dense bodies instead of Z disks as in skeletal muscle Have noncontractile intermediate filaments Ca 2+ required to initiate contractions Types Visceral or unitary Function as a unit Multiunit Cells or groups of cells act as independent units.
Muscle III. Smooth Muscle. Smooth Muscle. Not striated. Lack sarcomeres. Found in the walls of hollow organs. Not under voluntary control. Each cells is spindle shape. Diameter 2-10 um. Single nucleus. Capacity to divide through life. Thick filament: Myosin. Thin filament: actin.