A&P II Final Review 2024

Front

What is the All or None Principle?

Back

The All or None Principle states that a neuron fires at the same intensity regardless of the strength of the stimulus, meaning it either fires completely or not at all.

Front

What is the role of neuroglia?

Back

Neuroglia support and nourish neurons, playing a crucial role in maintaining the health and functionality of the nervous system.

Front

Which organ is responsible for storing bile?

Back

The gallbladder stores bile, which is produced by the liver and helps in the digestion of fats.

Front

What is a neuron?

Back

A neuron is a specialized cell in the nervous system that transmits nerve impulses, consisting of a cell body, dendrites, and an axon.

Front

Why is -55 mV significant in neuronal activity?

Back

-55 mV is the threshold potential required to initiate an action potential in a neuron.

Front

What is an action potential?

Back

An action potential is a rapid change in the electrical charge of a neuron that occurs when it is stimulated, allowing the transmission of signals.

Front

What are neurotransmitters?

Back

Neurotransmitters are chemical messengers released by neurons to communicate with other neurons or target cells.

Front

What is the function of the gallbladder?

Back

The gallbladder stores and concentrates bile, releasing it into the small intestine to aid in the digestion of fats.

Front

What is repolarization in neurons?

Back

Repolarization is the process during an action potential where the membrane potential returns to a negative value after depolarization.

Front

What is the resting membrane potential of a neuron?

Back

The resting membrane potential of a neuron is typically around -70 mV, indicating a polarized state.