Skeletal Muscle Physiology on the Cellular Level (A&P)

Skeletal muscle contractions involve the stimulation of muscle fibers by _ nerves

• Somatic

• Sympathetic

• Parasympathetic

• Sensory

Skeletal muscles are under _ control

• Voluntary

• Involuntary

• It depends on the skeletal muscle

When skeletal muscle contract to cause movement they _

• Shorten

• Extend

• It depends on the specific movement

When skeletal muscle contract to cause movement they _ bones

• Pull

• Push

• It depends on the specific movement

Skeletal muscle contractions begin with the generation and transmission of _

• Action potentials

• Hormones

• Neurotransmitters

• Sensory information

The action potential (electrical signal) that kickstarts skeletal muscle contractions is generated and transmitted in a _

• Motor neuron

• Muscle fiber

• Sensory neuron

• Interneuron

Action potentials in motor neurons cause the secretion of _ across synapses at NMJs

• ACh neurotransmitters

• Ca²⁺

• Na⁺

• Cl^-

• K⁺

Once it has diffused across the synapse, ACh binds to _

• Muscle fibers

• Motor neurons

• Sensory neurons

• Interneurons

The receptors that ACh bind to on muscle fibers are attached to _

• Transport proteins

• Motor end plates

• The sarcolemma

• T-tubules

• The sarcoplasmic reticulum

The binding of ACh to receptors attached to transport proteins causes the _ of said transport proteins

• Opening

• Closing