anatomy ch6

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Smooth muscle

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Involuntary, visceral, nonstriated muscle found in the walls of hollow organs such as intestines and blood vessels

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Cardiac muscle
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Involuntary striated muscle found in the heart, responsible for pumping blood throughout the body.

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31 Terms

1

Smooth muscle

Involuntary, visceral, nonstriated muscle found in the walls of hollow organs such as intestines and blood vessels

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2
Cardiac muscle

Involuntary striated muscle found in the heart, responsible for pumping blood throughout the body.

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3
Sarcolemma

The thin, transparent membrane surrounding each muscle fiber that contains the muscle cell's content.

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4
Myofibril

Long, thread-like structures in muscle fibers that are made of myofilaments, crucial for muscle contraction.

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5

Sarcomere

The basic contractile unit of striated muscle fibers, consisting of a repeating pattern of myofilaments.

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6

Myofilament

The protein filaments (thick and thin) that make up myofibrils, crucial for muscle contraction.

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7

Cardiac muscle

Involuntary striated muscle found in the heart.

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8

Skeletal muscle

Voluntary muscle responsible for body movement, attached to bones.

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9

Myofibril

Long, thread-like structures in muscle fibers that are made of myofilaments.

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10

Thick filaments

Protiens, primarily myosin, responsible for muscle contraction.

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11

Thin filaments

Proteins, primarily actin, that work with thick filaments for muscle contraction.

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12

Neurotransmitter

Chemical messengers that transmit signals across a synapse.

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13

Acetylcholine (ACh)

The neurotransmitter used at neuromuscular junctions to trigger muscle contraction.

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14

Muscle fibers

Single muscle cells that make up muscle tissue and are responsible for contraction.

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15

Skeletal muscle fibers

Type of striated muscle fibers that are under voluntary control, primarily found in muscles attached to bones.

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16

Striated muscle

A type of muscle characterized by its striped appearance, found in skeletal and cardiac muscles.

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17

Voluntary muscle

Muscle that is consciously controlled, such as skeletal muscle.

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18

Perimysium

Connective tissue that surrounds a fascicle of muscle fibers.

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19

Fascicle

A bundle of muscle fibers surrounded by perimysium.

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20

Epimysium

The outer connective tissue layer that surrounds an entire muscle.

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21

Tendon

A fibrous connection between muscle and bone, allowing for movement.

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22

Aponeurosis

A flattened sheet of connective tissue that connects muscle to muscle or muscle to bone.

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23

Actin

A protein that forms thin filaments in muscle fibers and plays a key role in muscle contraction.

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24

Myosin

A motor protein that forms thick filaments and interacts with actin for muscle contraction.

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25

Cross bridges

Connections formed between myosin heads and actin during muscle contraction.

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26

Motor unit

A single motor neuron and the muscle fibers it innervates.

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27

Axon

The long projection of a neuron that conducts electrical impulses away from the neuron.

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28

Axon terminals

Branches at the end of an axon that connect to muscle fibers to transmit signals.

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29

Neuromuscular junctions

Specialized synapses where motor neurons communicate with muscle fibers.

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30

Synaptic cleft

The small gap between the axon terminal and the muscle fiber membrane at the neuromuscular junction.

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31

Sarcoplasmic reticulum

A storage site for calcium ions that regulate muscle contraction.

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