An Action Potential Has Reached the Synaptic End Bulb, but There

question 53

Multiple Choice

An action potential has reached the synaptic end bulb, but there is no neurotransmitter release. This could be caused by

• A) failure of the voltage-gated k⁺ channels to open, thus preventing repolarization
• B) failure of the synaptotagmin to form channels for the neurotransmitter to cross the membrane
• C) failure of voltage-gated ca²⁺ channels to open, preventing ca²⁺ from entering the cell
• D) failure of kinesins to transport vesicles across the synaptic cleft

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Definitions:

Physical Development

The development beginning in early childhood and extending into late adolescence, focusing on the improvement of both gross and fine motor abilities along with pubertal changes.

Cognitive Development

The process by which a person perceives, thinks, and gains understanding of his or her world through the interaction and influence of genetic and learned factors.

Emotional Development

The process through which individuals learn to recognize, understand, express, and manage emotions.

Preoperational Stage

A phase in Jean Piaget's theory of cognitive development (from approximately 2 to 7 years of age) where children are unable to perform logical mental operations but develop memory and imagination.