Phase 1 of the action potential graph is a
Group of answer choices
graded depolarization
action potential depolarization
repolarization
hyperpolarization
graded depolarization
Phase 1 of the action potential graph is graded depolarization.
To determine the correct answer, let's break down the action potential graph.
The action potential graph represents the changes in voltage that occur during the generation and transmission of an electrical impulse in a neuron or muscle cell. It typically consists of several phases.
Now, let's analyze the given options:
1. Graded depolarization: This term refers to a small, localized change in the membrane potential that can occur in response to a stimulus. However, it does not represent a specific phase in the action potential graph.
2. Action potential depolarization: This option could potentially be the correct answer since depolarization is indeed a phase in the action potential graph. During depolarization, the membrane potential becomes less negative or even positive due to the influx of positively charged ions, such as sodium ions.
3. Repolarization: This option is also a valid phase in the action potential graph. Repolarization follows depolarization and involves the restoration of the membrane potential back to its resting state (usually negative) by the efflux of positively charged ions.
4. Hyperpolarization: Hyperpolarization refers to a phase where the membrane potential becomes more negative than the resting membrane potential. This phase can occur after repolarization and is caused by the efflux of an excessive amount of positively charged ions or the influx of negatively charged ions.
Based on the description of the different phases, it is evident that the correct answer for phase 1 of the action potential graph is "action potential depolarization."