Ch 12 Notes (B) - Bio 251 Human Anatomy Physiology Chapter...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Bio 251 Human Anatomy & Physiology Chapter 12 Nervous Tissue (B)
Background image of page 1

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

View Full Document Right Arrow Icon
Electrophysiology Basics Electrophysiology—cellular mechanisms for producing electrical potentials and currents Basis for neural communication and muscle contraction Electrical potential—a difference in the concentration of charged particles between one point and another Voltage (in a battery; in a cell) Electrical current—a flow of charged particles from one point to another In the body, currents are movements of ions, such as Na + or K + , through gated channels in the plasma membrane
Background image of page 2
Resting Membrane Potential All living cells are polarized Resting membrane potential Unequal distribution of electrolytes between the ECF and the ICF Ions diffuse down their concentration gradients Membrane is selectively permeable Cations & anions are electrically attracted to each other
Background image of page 3

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

View Full Document Right Arrow Icon
Resting Membrane Potential In a resting cell: Major INTRACELLULAR ion is K+ Major EXTRACELLULAR ion is Na+ RMP = -70mV Maintained by Na+/K+ pump
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 22

Ch 12 Notes (B) - Bio 251 Human Anatomy Physiology Chapter...

This preview shows document pages 1 - 5. Sign up to view the full document.

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