KINE 1P90 Lecture Notes - Lecture 5: Fluid Compartments, Schwann Cell, Extracellular Fluid

• School: Brock University
• Department: Physical Education and Kinesiology
• Course: KINE 1P90
• Professor: David Ditor

Document Summary

Muscle activation and motor control lec 5. Muscles need to be innervated (by nerve) before contraction. Myelin thin sheet-like cell that wraps itself around axon; insulates some neurons. Allows for faster conduction of electrical signal. Goes by diff names based on where it is: cns oligodendrocytes, pns schwann cells. Electrical signal that travels along nerve action potential. Potential: electrical charge inside and outside the cell electrical charges are different across membrane of cell membrane potential charge inside vs charge outside of membrane. Resting potential differe(cid:374)(cid:272)e i(cid:374)side tha(cid:374) outside, a(cid:374)d it"s sta(cid:271)le a(cid:374)d (cid:374)ot (cid:272)ha(cid:374)gi(cid:374)g. Action potential differe(cid:374)(cid:272)e i(cid:374)side a(cid:374)d outside, a(cid:374)d it"s (cid:272)ha(cid:374)gi(cid:374)g; i(cid:374) a(cid:272)tio(cid:374) Membrane potential electric charge inside cell is different than outside; electrically polarized reason why is because there is a different number of cations and anions inside cell compared to outside. Ions that are important (making electrical difference inside than outside): sodium (+), potassium (+), anions (-) large intracellular proteins.