2-4 Nervous System-answers

2-4 Nervous System-answers - SI Leader: Anita Vijapura...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
SI Leader: Anita Vijapura Spring 2010 BSC2011 02/04/2010 Nervous System The functional subunit is ___________________. 1. Cell body 2. Dendrite 3. Axon A group of cell bodies is called __________________. Bundles of dendrites or axons is called ______________________. The resting potential of a neuron is _______, due to a _________________ and _________________ gradient. Why is there this gradient? 1. active Na+/K+ exchange pumps 3 Na+ out of the cell and 2 K+ into the cell net loss of positive charges, making cytoplasm electronegative to the extracellular fluids 2. anionic proteins in the cytoplasm 3. differential permeability is major cause of the electrical potential: 100X as permeable to K+ as it is the Na+ channels so K+ diffuses out must faster than Na+ diffuses into the cell—makes the inside neg to out. What carries information down the neuron? Action potential Define threshold potential : Why is it called all-or-nothing response ? Explain the phases in the following picture:
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

2-4 Nervous System-answers - SI Leader: Anita Vijapura...

This preview shows document pages 1 - 2. Sign up to view the full document.

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