Lecture8 copy - Lecture #8 (Skeletal Muscle Structure and...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture #8 (Skeletal Muscle Structure and Function) 18/07/2008 12:21:00 I. Muscle types and characteristics A. Skeletal muscle movement, posture, shivering striated controlled by somatic motor neurons (voluntary) very malleable (changeable) usually by training/ disuse (use it or lose it) o hypertrophy: muscle gets larger o atrophy: muscle gets smaller with disuse B. Cardiac muscle heart striated *both constructed of same kind of components controlled by autonomic nervous system (involuntary) C. smooth muscle hollow organs, blood vessels not striated (no sarcomeres) controlled by autonomic nervous system (involuntary) II. Hierarchy and Structure A. Hierarchy Protein filements: actin and myosin Sarcomere: particular arrangement of actin and myosin ( smallest part that you can shorten) myofibril: sarcomere end to end muscle cells (muscle fiber, myofiber) bundles of myofibril fascicle: group of muscle cells muscle: particular arrangement of fascicles; at the organ level B. Muscle cells Multi-nucleated sarcolema o elastic membrane o important for conduction of electrical (neural) signals sarcoplasm: cell fluid o myofibrils are suspended in sarcoplasm o contains potassium liquid droplets, enzymes and large number of mitochondria sarcoplasmic reticulum * contains and sequesters calcium (Ca2+) ions C. Sarcomere (figure 1+2) I= isotropic A= anisotropic H= helig (light in german) III. Contraction A. proteins 1. mysocin: thick filements (figure 3) 2. actin: thin filements (figure 4) 3. tropomyosin: long, thin rods 4. troponin: globular protein that sits on tropomyosin (3 subunits)4....
View Full Document

This note was uploaded on 07/23/2008 for the course BIO 131 taught by Professor Mostman during the Summer '08 term at University of California, Santa Cruz.

Page1 / 14

Lecture8 copy - Lecture #8 (Skeletal Muscle Structure and...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online