Muscle Tissue Structure and Classification

Play an AI-generated podcast conversation about this lesson

Which type of muscle has multinucleated cells?

Skeletal striated muscle (correct)

Cardiac striated muscle

Smooth muscle

None of the above

What is the cytoplasm of muscle cells called?

Sarcoplasmic reticulum

Sarcosoma

Sarcoplasm (correct)

Sarcolemma

Which type of muscle shows dark and light bands in the cell as striations?

Skeletal striated muscle (correct)

Cardiac striated muscle

Smooth muscle

None of the above

Where are the nuclei located in skeletal striated muscle cells?

In the periphery, next to the plasma membrane Signup and view all the answers

Which type of muscle forms the muscles of the locomotor apparatus?

Skeletal striated muscle Signup and view all the answers

What causes dark and light bands to be observed in striated muscle cells?

Arrangement of contractile filamentous proteins Signup and view all the answers

What is the primary function of motor fibers in muscle contraction?

Causing contraction Signup and view all the answers

Which type of muscle cells has a very limited capacity for regeneration?

Cardiac muscle cells Signup and view all the answers

What is the primary shape of smooth muscle cells?

Spindle-shaped Signup and view all the answers

What allows cardiac muscle cells to contract rhythmically and spontaneously?

GAP junctions Signup and view all the answers

Which structure keeps the two cardiac cells together at their junctions?

Desmosomes Signup and view all the answers

What is the primary function of autonomous fibers in muscles?

Innervating the vessels Signup and view all the answers

Which type of muscle is present in the walls of hollow viscera and blood vessels?

Smooth muscle Signup and view all the answers

"Law of all or nothing" applies to which aspect of muscle contraction?

Contraction upon receiving a stimulus Signup and view all the answers

What is the primary function of sensory fibers in muscles?

Collecting sensitive information from the muscle Signup and view all the answers

Which type of muscle is voluntary and present only in the heart?

Cardiac muscle Signup and view all the answers

What is the connective tissue that surrounds each muscle cell called?

Endomysium Signup and view all the answers

What acts as regenerative cells to repair the damage suffered by the muscle?

Satellite cells Signup and view all the answers

What gives rise to dark and light bands in a myofibril?

Arrangement of myofilaments Signup and view all the answers

Where are the Z-disks anchored in a sarcomere?

Thin filaments Signup and view all the answers

What is the main component of thin filaments in a sarcomere?

F-actin Signup and view all the answers

What does each actin molecule have a binding site for in a sarcomere?

Myosin Signup and view all the answers

What do the globular heads of myosin filaments have binding sites for?

Actin and ATP Signup and view all the answers

Where are the nuclei typically located in a muscle cell?

Periphery Signup and view all the answers

What role do T-tubes play in muscle contraction?

Allow all myofibrils to be in contact with the plasma membrane for contraction Signup and view all the answers

What is stored within the sarcoplasmic reticulum and is necessary for muscle contraction?

Calcium ions Signup and view all the answers

What causes the tropomyosin to move, allowing actin and myosin to bind during muscle contraction?

Binding of calcium to troponin Signup and view all the answers

What is responsible for stopping the contraction by re-sequestering calcium from the cytoplasm?

Sarcoplasmic reticulum Signup and view all the answers