Podcast
Questions and Answers
What causes depolarization in a cell?
What causes depolarization in a cell?
What is the main cause of hyperpolarization in a cell?
What is the main cause of hyperpolarization in a cell?
What are graded potentials primarily caused by?
What are graded potentials primarily caused by?
What is the duration of graded potentials?
What is the duration of graded potentials?
Signup and view all the answers
What is the threshold for action potentials?
What is the threshold for action potentials?
Signup and view all the answers
Depolarization is due to the net flow of positive charges into the cell or negative charges to regions outside the cell. Hyperpolarization is due to the net flow of negative charges into the cell or positive charges outside the cell. Such changes in ion permeability are often termed changes in the ______
Depolarization is due to the net flow of positive charges into the cell or negative charges to regions outside the cell. Hyperpolarization is due to the net flow of negative charges into the cell or positive charges outside the cell. Such changes in ion permeability are often termed changes in the ______
Signup and view all the answers
There are two qualitatively different types of axon excitations: graded potentials and ______
There are two qualitatively different types of axon excitations: graded potentials and ______
Signup and view all the answers
Graded potentials are minor perturbations in the membrane potential due to the binding of neurotransmitters, the stimulation of sensory reception, or spontaneous ion leakage through the cell ______
Graded potentials are minor perturbations in the membrane potential due to the binding of neurotransmitters, the stimulation of sensory reception, or spontaneous ion leakage through the cell ______
Signup and view all the answers
There is no threshold needed to stimulate a graded potential. They last for 5 ms to several min. Graded potentials can be either membrane depolarizations or ______
There is no threshold needed to stimulate a graded potential. They last for 5 ms to several min. Graded potentials can be either membrane depolarizations or ______
Signup and view all the answers
Action potentials are qualitatively different from graded potentials in every way. They initially have relatively large depolarizations by ~15– 20mV. The potential lasts for 1–5 ms, and they have a threshold of about ~ −55 mV. 3. Action potentials are propagated over long distances along the ______
Action potentials are qualitatively different from graded potentials in every way. They initially have relatively large depolarizations by ~15– 20mV. The potential lasts for 1–5 ms, and they have a threshold of about ~ −55 mV. 3. Action potentials are propagated over long distances along the ______
Signup and view all the answers
