KINESIOL 3U03 Lecture Notes - Lecture 14: Extracellular Fluid, Cardiac Muscle, Smooth Muscle Tissue
22 Feb 2019
School
Department
Course
Professor
Document Summary
Difficult to study in children (invasive: can using imaging techniques (mri) Fetal muscle: small fibers, few number, separated by extracellular material, result a lots of extracellular fluid (because of lots space) At birth (term: fibers remain small, increased number, more closely packed, less extracellular fluid. Adult: larger diameter fibres/tightly packed, decrease in extracellular fluid. With growth: decrease in concentration of extracellular ions (na and cl, less fluid (fewer ions in the extracellular fluid) Increase in concentration of intracellular components (k and p) as fiber growth bigger. Water % decrease: decrease dramatically till adulthood + other component% increase. Increase in fibre size (postnatal: result decrease in extracellular component (more and bigger fiber sin same amount of space) At birth, reach the maximum amount of muscle fiber. After birth, it increase the fiber size. Increased in total muscle nitrogen (non-protein and cellular: prenatal to adulthood. Increased fibrillate protein % postnatally: physical demand (activity/contraction, pa will help the muscle to grow, anabolic hormones.
