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Physiology

A vibrant illustration depicting an action potential propagation in a myelinated nerve fiber, showing diagrams of nodes of Ranvier and synapses, with labels indicating ion channels and neurotransmitters.

Test Your Physiology Knowledge

Welcome to the Physiology Quiz! This engaging quiz is designed to test your understanding of key concepts in physiology, particularly focusing on nerve function and action potentials. Challenge yourself with a series of carefully crafted questions that will not only assess your knowledge but also deepen your understanding of this fascinating subject.

Whether you're a student, teacher, or simply interested in physiology, this quiz is perfect for you. Here are some highlights:

10 thought-provoking questions
Immediate feedback on your answers
Learn while you play!

10 Questions2 MinutesCreated by JumpingNeuron517

. The resting potential of a myelinated nerve fiber is primarily dependent on the concentration gradient of which of the following ions?

A) Ca +

B) Cl −

C) HCO3 −

D) K+

Which of the following is a consequence of myelination in large nerve fibers?

A) Decreased velocity of nerve impulses

B) Generation of action potentials only at the nodes of Ranvier

C) Increased energy requirement to maintain ion gradients

D) Increased membrane capacitance

E) Increased nonselective diffusion of ions across the axon membrane

Which of the following is not a graded potential?

A. slow-wave potential

B. Receptor potential

C. Action potential

D. end-plate potential

Repolarization phase of action potential is due to:

A. Potassium efflux

B. Sodium efflux

C. Potassium influx

D. Sodium influx

Which statement is not accurate about the absolute refractory period?

A. Another stimulus, regardless of its strength, cannot initiate another action potential during this period.

B. During this period, voltage-gated Na+ channels open, then close and are inactivated.

C. Immediately following this period, the membrane can experience another action potential if the stimulus is strong enough.

D. This period occurs during the hyperpolarization phase of the action potential

A change in a membrane potential from -70 mV to -100mV is an example of:

A. depolarization

B. hyperpolarization

C. polarization

D. repolarization

Saltatory conduction of action potential:

A. Take place in myelinated axon

B. Action potential touch every single

C. Action potential move backward

D. Take place in non-myelinated axon

the major excitatory neurotransmitter at neuronal synapses is :

A. Acetylcholine

B. Epinephrine

C. Glutamate

D. GABA

Reduction of membrane potential from -70 to -50 mV is

A. Depolarization

B. Repolarization

C. Hyperpolarization

D. Rest membrane potential

Which statement is incorrect?

A. Saltatory conduction occur in myelinated nerve fibers

B. A local current flow from an active to an adjacent inactive area decreases the potential in the inactive area to threshold.

C. Contiguous conduction occurs along Schwann cells that surround myelinated nerve fibers

D. Saltatory conduction is faster than contiguous conduction.

E. Contiguous Conduction occur in unmyelinated fibers.

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