PLN 103 Lecture Notes - Lecture 9: Voltage, Defecation, Calsequestrin

• School: Ryerson University
• Department: Physiology
• Course: PLN 103
• Professor: Juliatotosydezepetnek

Document Summary

Intercalated disks connect cells for contraction: smooth. Skeletal muscle (6 maj functions: skeleton movement (contractions, posture (muscle tension, support soft tissue, guard body entrance and exit (over swallowing, defecation, maintain body temperature, store nutrients. Myoblast fuse nucleate skeletal muscle fibres: myosatelite (cid:272)ells= (cid:373)yo(cid:271)lasts that did(cid:374)"t fuse. Used for injury (get bigger, divide and fuse with damaged muscle fibre) Skeletal muscles contain: mostly muscle tissue, and then connective tissue, nerve, and blood vessels. Epimysium: dense collage fibre, outside layer like cell membrane, surrounds the whole muscle, contains: Vascular network nutrient and oxygen, carry away waste. Perimysium has blood vessels and nerves in it in endomysium arterioles (supply blood to muscle fibre via capillaries) in epimysium nerve fibres branch through perimysium endomysium muscle fibres. Each muscle fibre contains a lot of myofibrils: when these shorten= contraction. Myofibril consists of myofilaments: thin (actin), thick (myosin: titin= elastic associated with myosin. When myofibril contracts while cell becomes shorter (and pulls on tendon)