AP BIOLOGY

Detailed explanation-1: -The messages carried by neurons are called nerve impulses. Nerve impulses can travel very quickly because they are electrical impulses. Neurons are usually classified based on the role they play in the body. Two main types of neurons are sensory neurons and motor neurons.

Detailed explanation-2: -Axon is the part of the neuron through which information travels as an electric impulse.

Detailed explanation-3: -The electrical impulse travels from the sinus node to the atrioventricular node (also called AV node). There, impulses are slowed down for a very short period, then continue down the conduction pathway via the bundle of His into the ventricles.

Detailed explanation-4: -Within a neuron, the impulse moves to the tip of an axon and causes the release of neurotransmitters, chemicals that act as messengers. Neurotransmitters pass through the synapse, the gap between two nerve cells, and attach to receptors on the receiving cell.

Detailed explanation-5: -Summary. A nerve impulse begins when a neuron receives a chemical stimulus. The nerve impulse travels down the axon membrane as an electrical action potential to the axon terminal.