AP168 Exam #5 Review

Front

What gives skeletal muscle its characteristic reddish brown color?

Back

Myoglobin

Front

What are the characteristics of cardiac muscle?

Back

Cardiac muscle contracts as a syncytium, excites itself, and is only found in the heart.

Front

What happens to the membrane potential when it becomes more negative?

Back

The membrane is hyperpolarized.

Front

What are myofibrils primarily composed of?

Back

Actin and myosin.

Front

What type of fiber allows for the most rapid conduction of an impulse along an axon?

Back

Thick and myelinated fibers.

Front

Define myoglobin.

Back

Myoglobin is a protein in muscle cells that binds oxygen, giving skeletal muscle its reddish color.

Front

What is the function of actin in muscle contraction?

Back

Actin is a thin filament that interacts with myosin to facilitate muscle contraction.

Front

What is the role of myosin in muscle contraction?

Back

Myosin is a thick filament that pulls on actin filaments to cause muscle contraction.

Front

Explain the term 'depolarization' in the context of membrane potential.

Back

Depolarization refers to a decrease in the membrane potential, making it less negative.

Front

What is hyperpolarization?

Back

Hyperpolarization is an increase in the membrane potential, making it more negative than the resting potential.