Action Potential Components and Ion Redistribution Quiz

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What is excitability in the context of excitable membranes?

The ability of tissues to generate electrical signals (correct)

The ability of tissues to resist external stimuli

The ability of tissues to block electrochemical signals

The ability of tissues to store electrical impulses

Which of the following tissues are considered excitable tissues?

Blood vessels and Bones

Kidneys and liver

Nails and hair follicles

Nerves and Muscles (correct)

What is the typical resting membrane potential (RMP) value for skeletal muscles?

-50 mV

-60 mV

-90 mV (correct)

-70 mV

What contributes to the resting membrane potential of excitable tissues?

Selective permeability of cell membrane Signup and view all the answers

What does it mean when the inner surface of a nerve fiber is negatively charged during rest?

It is polarized Signup and view all the answers

What role do passive (non-gated) channels play in the resting membrane potential?

Responsible for maintaining the RMP Signup and view all the answers

During Repolarization, the M gate of voltage-gated Na channels is:

Opened Signup and view all the answers

At rest, the n-gate of voltage-gated K channels is:

Closed Signup and view all the answers

What is the main cause of the Resting Membrane Potential (RMP)?

Diffusion of K+ ions from inside to outside the cell Signup and view all the answers

What type of potential results from stimulation by an ineffective or subminimal stimulus?

Graded potential Signup and view all the answers

What is the significance of the Sodium & Potassium Pump (Na-K pump)?

Electrogenic - pumps 2 Na+ outside in exchange for 3 K+ inside Signup and view all the answers

Where does the receptor potential typically occur?

In the beginning of sensory nerves Signup and view all the answers

What type of channels are responsible for Action Potential?

Voltage-activated channels Signup and view all the answers

What happens to the h gate of voltage-gated Na channels during Depolarization?

Opened Signup and view all the answers

Which type of potential propagates along nerve fibers without decrement and produces a response?

Action potential Signup and view all the answers

What happens during Rapid Depolarization in an Action Potential?

Massive Na+ influx leading to membrane potential becoming positive Signup and view all the answers

What occurs during Repolarization phase of an Action Potential?

K+ efflux through voltage-activated K+ channels Signup and view all the answers

What initiates the opening of Voltage-Activated Na channels in Slow Depolarization?

Increase in membrane permeability to Na+ ions Signup and view all the answers

What is the role of the Na-K pump?

Transport sodium out and potassium into the cell Signup and view all the answers

What is the latent period in the monophasic action potential?

Time between application of stimulus and appearance of response Signup and view all the answers

What is the primary cause of negative after potential in nerve cells?

Slow potassium efflux Signup and view all the answers

Which ion is transported out of the cell by the Na-K pump?

Sodium Signup and view all the answers

Where is the reference electrode typically placed in recording action potentials?

Outside the cell Signup and view all the answers

What is the main function of the M gate (activation gate) of voltage-gated Na channels?

Cover extracellular surface Signup and view all the answers