Resumen
full summary of case 8 How do we move? Muscle force
- Grado
- Institución
- Book
Summary of the case with the important concepts and mechanisms of generating muscle force.
[Mostrar más]Vista previa 2 fuera de 7 páginas
Vista previa 2 fuera de 7 páginas
Añadir al carrito
Añadir al carrito
Libro relacionado
Título del libro:
Autor(es):
- Edición:
- ISBN:
- Edición:
Vendedor
Seguir
farahahssan
Comentarios recibidos
Vista previa del contenido
Case 8 How do we move? Muscle force, 1.Microscopic anatomy: sarcomeric anatomy, myofibrils:
Muscle consists of fascicules, fascicules consist of muscle fibers, and muscle fibers consist of myofibrils
and myofibrils consist of sarcomeres.
-Sarcomere structure:
-are cylindrical and vary in length between 1 and 5 micrometers depending on the length of the
muscle.
-are comprised of several interlacing’ ‘thick'' and ''thin'' filaments, which slide past each other as the
sarcomere changes length.
-thick filaments are formed by hundreds of myosin tails, thin filaments are composed of three
proteins: actin, tropomyosin, and troponin.
actin: provides binding sites for the myosin heads, the binding sites are spaced at regular intervals
along the thin filament.
tropomyosin and troponin: help to regulate force production by exposing these binding sites only
when the muscle is activated by the nervous system and in presence of calcium.
titin: attaches each thick filament to the ends of the sarcomere (which we call Z-lines or Z-discs), plays
an important role in passive force generation.
-sarcomeres are arranged in series and parallel within skeletal muscle in a regular pattern, resulting in
striations, alternating light and dark bands viewed under a microscope.
-Z-discs and M-discs are also called lines because that's how they look like in 2D.
- A bands (dark) appear in regions containing myosin and the I bands (light band) consist of the thin
filaments of 2 sarcomeres.
-the thin actin filaments are anchored at one end to the Z-discs.
-the thick myosin filaments attach at one end to structures in the M-discs and at the other end are
tethered to the Z-discs by titin molecules.
Nebulin: span from the Z line to the actin filaments, acts as a template for the thin filament assembly.
T tubule: are extensions of the cell membrane (sarcolemma) that associates with the terminal cisternae
Los beneficios de comprar resúmenes en Stuvia estan en línea:
Garantiza la calidad de los comentarios
Compradores de Stuvia evaluaron más de 700.000 resúmenes. Así estas seguro que compras los mejores documentos!
Compra fácil y rápido
Puedes pagar rápidamente y en una vez con iDeal, tarjeta de crédito o con tu crédito de Stuvia. Sin tener que hacerte miembro.
Enfócate en lo más importante
Tus compañeros escriben los resúmenes. Por eso tienes la seguridad que tienes un resumen actual y confiable. Así llegas a la conclusión rapidamente!
Preguntas frecuentes
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
100% de satisfacción garantizada: ¿Cómo funciona?
Nuestra garantía de satisfacción le asegura que siempre encontrará un documento de estudio a tu medida. Tu rellenas un formulario y nuestro equipo de atención al cliente se encarga del resto.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller farahahssan. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for 2,99 €. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
45,681 summaries were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now