ch 11 quiz

Action potentials are propagated from the surface to the interior of a muscle fiber by way of

The triads of a muscle fiber consist of

In a relaxed muscle fiber, the active sites of actin are blocked by

Each end of a sarcomere is marked by

When there is not enough oxygen to create ATP by aerobic respiration, a muscle fiber can produce ATP by borrowing phosphate groups from

Which of the following is considered to be a regulatory protein of the myofilaments?

Chicken legs have dark meat because of an abundance of oxygen storage pigment in their fibers. The pigment is called _____ and the fibers are _____.

Which of these processes occurs during the contraction of skeletal muscle?

Oxygen debt is the amount of extra oxygen needed after an exercise to do all of the following except

Which of the following is not found in the thin filaments of striated muscle?

In contrast to red muscle fibers, white fibers

The loss of muscle mass from disuse is called

Posture is maintained mainly by ___ fibers because they fatigue _____.

Endurance training favors all of the following changes in the skeletal muscles except

A motor unit is

If a poison inhibits the activity of acetylcholinesterase, a muscle

The fibrous tissue that surrounds each muscle cell or fiber is called ____ and its function is to endomysium; insulate adjacent muscle cells from one another

You are working out with weights and after a while you notice that your muscles are becoming larger. This can be best explained because

In skeletal muscle fibers, the elastic filaments are called _____ and their function is to

In a resting muscle or nerve cell, there are excess _____ ions in the extracellular fluid and excess _____ ions in the intracellular fluid.

The resting potential across the sarcolemma of a skeletal muscle cell is about _____ millivolts (mV)

In an action potential, the _____ voltage regulated gates open first followed by the ____ voltage regulated gates opening

A molecule of ATP is needed twice for each complete cycle of a power stroke. ATP is needed to

As a muscle relaxes, calcium moves back into the sarcoplasmic reticulum by a process called

The amount of force produced by a muscle is proportional to all of the following factors except one. Identify the exception.

In a resting muscle, most of the ATP generated by aerobic respiration comes from

In your quadriceps femoris, which is a powerful muscle group that extends the knee, you have the following proportion of slow-twitch and fast-twitch fibers: 85% slow-twitch and 15% fast-twitch. You most likely perform best at

The movement of your fingers is controlled by muscles which have a greater proportion of

You are examining a cross-sectional slide of a muscle, and you noticed the following characteristics in most of the muscle fibers: smaller diameter, abundant mitochondria, abundant myoglobin, and low levels of glycogen reserves. This muscle is predominantly made up of fibers that are

Lifting a box off the floor unto a table is called a _____ contraction of your biceps brachii while lowering the box onto the floor is called a _____ contraction of your biceps brachii.

Which of the following supports the sliding filament theory of muscle contraction

In skeletal muscle, groups of muscle cells are called _____ and are surrounded by a connective tissue sheath called the ______.