NU FS374 Study Guide - Quiz Guide: Cardiac Muscle, Endoplasmic Reticulum, Troponin

• School: University of Alberta
• Department: Nutrition and Food Sciences
• Course: NU FS374
• Professor: Mirko Betti

Document Summary

As we already know the muscle is broken down into many different layers. The basic unit of muscle however, is called a sarcomere. This is the repeating structure that makes up each myofibril. Regions of the sarcomere are: a band: dark zone i. e. the le(cid:374)gth of (cid:373)yosi(cid:374). Does(cid:374)"t shorte(cid:374): z line: end to end, i band: light zone i. e. (cid:449)here a(cid:272)ti(cid:374) does(cid:374)"t o(cid:448)erlap (cid:373)yosi(cid:374). Horte(cid:374)s: m line: the middle line of the sarcomere, h zone: (cid:373)iddle of the a (cid:271)a(cid:374)d (cid:449)here (cid:373)yosi(cid:374) does(cid:374)"t o(cid:448)erlap a(cid:272)ti(cid:374) anymore. Can shorten to the point where it can disappear. The two kinds of myofilaments are: actin: can exist as globular or filamentous. The second most abundant myofibril protein: myosin: hydrolyzes atp adp + p with mg 2+ present. It has a clubbed head that is capable of pivoting. These microfilaments make up the different thick and thin filaments.