객관식
Which catecholamine receptor subtype is primarily responsible for increasing heart rate (positive chronotropy) in the heart?
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14. The Autonomic Nervous System
Neurotransmitters of the ANS
객관식
Which of the following is released by all somatic motor neurons at their synapses and always has an excitatory effect on skeletal muscle?
A
norepinephrine
B
adrenaline
C
acetylcholine
D
endorphin
검증된 단계별 안내1
Identify the role of somatic motor neurons: Somatic motor neurons are responsible for transmitting signals from the central nervous system to skeletal muscles, causing them to contract.
Understand the neurotransmitter involved: Neurotransmitters are chemical messengers that transmit signals across a synapse from one neuron to another 'target' neuron, muscle cell, or gland cell.
Recognize the specific neurotransmitter for skeletal muscles: Acetylcholine is the neurotransmitter released by all somatic motor neurons at their synapses with skeletal muscle fibers.
Determine the effect of acetylcholine: When acetylcholine is released at the neuromuscular junction, it binds to receptors on the muscle cell membrane, leading to muscle contraction.
Conclude the excitatory nature: Acetylcholine always has an excitatory effect on skeletal muscle, meaning it stimulates the muscle to contract.
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