Question

1. match up the following terms with their correct definitions.

motor neuron
calcium
acetylcholine
myosin
actin
thin myofilaments
thick myofilaments
needed to initiate (start) a muscle contraction
muscle nerve cell
neurotransmitter that signals the release of calcium.

Explanation:

• Motor Neuron: A nerve cell that transmits signals to muscles, so it matches "Muscle nerve cell".
• Calcium: It is crucial for starting muscle contraction, so it matches "Needed to Initiate (start) a muscle contraction".
• Acetylcholine: A neurotransmitter that signals the release of calcium, so it matches "Neurotransmitter that signals the release of calcium".
• Myosin: It is part of the thick myofilaments in muscle fibers, so it matches "Thick myofilaments".
• Actin: It is part of the thin myofilaments in muscle fibers, so it matches "Thin myofilaments".

Answer:

Motor Neuron → Muscle nerve cell
Calcium → Needed to Initiate (start) a muscle contraction
Acetylcholine → Neurotransmitter that signals the release of calcium
Myosin → Thick myofilaments
Actin → Thin myofilaments