Cytoskeleton and Muscle Contraction Flashcard

Front

What are the three types of muscle tissue?

Back

Skeletal, smooth, and cardiac muscle.

Front

What are the two types of filaments present in all muscle types?

Back

Thick (myosin) and thin (actin) filaments.

Front

In a relaxed skeletal muscle, what is actin not chemically bound to?

Back

Myosin.

Front

What happens to a skeletal muscle when it is deprived of ATP?

Back

It enters a state where myosin and actin cannot separate and enters rigor.

Front

What is the functional unit of contraction in skeletal muscle?

Back

Sarcomere.

Front

What role do microtubules play in cell division?

Back

They are involved in chromosome movement during mitosis.

Front

What is the function of tropomyosin in muscle contraction?

Back

It blocks the binding sites on actin for myosin when the muscle is relaxed.

Front

What is the role of troponin in muscle contraction?

Back

Troponin binds calcium ions and causes tropomyosin to move, exposing binding sites on actin.

Front

What is the sarcolemma?

Back

The cell membrane surrounding a muscle fiber.

Front

What is the sarcoplasmic reticulum?

Back

A specialized endoplasmic reticulum in muscle cells that stores calcium ions.