NURS 5315 - M1 (Part
1A): Action Potential
fully solved & updated
2024-2025
Action Potential - answer process by which excitable cells transmit
information to one another
Where does action potential occur? - answer in nerve cells and all
types of muscle cells.
An alteration in the action potential may result from - answer
neurologic disease, muscle disease or electrolyte imbalances
Cell Membrane is responsible for - answer providing structure and
protection to the cell, regulating cellular activity by receiving
cellular signals, transport into and out of the cell, and cell to cell
interactions
The cell membrane is composed of: - answer phospholipids,
cholesterol and glycolipids. Phospholipids are responsible for
repairing the cell membrane by folding in on themselves and
forming a sealed compartment.
The cell membrane is highly permeable to: - answer lipid soluble
substances such as carbon dioxide, oxygen, fatty acids and steroid
hormones
, The cell membrane is not very permeable to: - answer water soluble
substances such as ions, glucose and amino acids.
What helps the cell membrane with maintaining homeostasis? -
answer Proteins; transmembrane proteins
Transmembrane proteins - answer span the entire width of the cell
membrane and are in contact with both the extracellular and the
intracellular compartments
Transmembrane proteins include - answer ligand-binding receptors
which bind with hormones or neurotransmitters;
Transport proteins - such as the Na+ -K + ATPase, pores, ion
channels, cell adhesion molecules and GTP-binding proteins (G
proteins)
The Na+ -K + ATPase is the - answer main protein which is
responsible for maintaining the correct balance of extracellular Na+
and intracellular K+ , which is needed for cellular excitation and
membrane conductivity
What is required for enzyme activity? - answer the maintenance of
intracellular K+ concentration is required for enzyme activity
Na concentration is _____________ on the outside of the cell and
potassium concentration is _____________________ on the inside of the
cell - answer Na+ concentration is greatest on the outside of the cell
and potassium concentration is greatest on the inside of the cell
The Na K pump, pumps sodium to the ECF and potassium to the ICF.
This protein transports______________of sodium to the _____ and
________molecules of potassium to the ICF. - answer This protein
transports 3 molecules of sodium to the ECF and two molecules of
potassium to the ICF.
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