Question

if a persons brain had a low level of neurotransmitters, how would this affect the person? a. neurons would not be able to communicate across synapses. b. sensory neurons would not be able to form action potentials. c. the endocrine system would not be able to produce hormones. d. axons would not be able to receive messages.

Explanation:

Neurotransmitters are crucial for synaptic communication. They are released by presynaptic neurons, cross the synaptic cleft, and bind to receptors on postsynaptic neurons. If there is a low level of neurotransmitters, this synaptic communication process is disrupted. Action potentials (related to option B) are generated within a neuron (not directly dependent on neurotransmitter levels in the way described). The endocrine system (option C) is a separate system that produces hormones (not directly related to neurotransmitter - neuron communication). Axons (option D) are part of the neuron's structure for transmitting signals away from the cell body, and they do not receive messages in the sense relevant to neurotransmitter - mediated communication. Neurotransmitters are specifically for inter - neuron (across synapses) communication.

Answer:

A. Neurons would not be able to communicate across synapses.