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Muscle Tissue
Muscle Tissue and Gross Anatomy
Question | Answer |
---|---|
skeletal muscle; striated or non-striated? | striated |
cardiac muscle; striated or non-striated? | striated |
smooth muscle; striated or non-striated? | non-striated |
which muscles are voluntary? | skeletal muscle |
which muscles are involuntary? | cardiac and smooth muscle |
what are the characteristics of skeletal muscle? | long, cylindrical, and multinucleated |
what are the characteristics of cardiac muscle? | Y-shaped branching, and intercalated discs |
what are the characteristics of smooth muscle? | small, spindle-shaped, and single nuclei |
what does 'striated' mean? | refers to the alternating lines on the tissue (light/dark bands) |
what does voluntary refer to? | having conscious control over the tissue |
what is the neuromuscular junction? | it is the area where the nerve makes a connection with skeletal muscle |
what is action potential? | the electrical current that runs through our nerves and muscles |
what is the somatic motor neuron axon? | the extension of the nerve that carries an action potential to the skeletal muscle |
what is the axon terminal? | the bulbous swelling at the end of the nerve that connects to the skeletal muscle. this is the part of the nerve that connects to the skeletal muscle |
what does terminal mean? | end |
where are the synaptic vesicles (transport sacs) located? | within the axon terminal |
describe the synaptic vesicles (transport sacs). | contain ACh, an excitatory neurotransmitter that diffuses from the nerve to the muscle and initiates the new action potential on the skeletal muscle. |