Chapter 10 mastering test

When a skeletal muscle fiber is at rest, its ATP demands are met by

Aerobic metabolism of fatty acids

A muscle producing its maximum tension for a prolonged period is in

Complete tetanus

Characteristics of skeletal muscle fibers include all of the following except that

Each fiber contains a single nucleus

What can the nervous system do to increase muscle tension?

Increase the number of active motor units Increase stimulation frequency Recruit larger motor units

The intercalated disk is NOT a site of

Neuromuscular transmission

During neuromuscular transmission, the axon terminals release __________.

Acetylcholine

Which of the following is NOT an effect that exercise will have on muscle tissue?

An increase in the amount of fibrous connective tissue

Muscles are attached to bones by tendons or

Aponeuroses

Triads in skeletal muscle fibers function in

Calcium ion release

Interactions between the thick and thin filaments are prevented by tropomyosin. To make the active sites accessible, __________ ions must bind to __________.

Calcium, troponin

Titin is a(n)

Elastic protein

Muscle fatigue occurs because of a buildup of __________ and a(n) __________ in pH

Lactic acid, decrease

Resting smooth muscle can be stretched without affecting tension development because of its

Plasticity

Which type of muscle tissue has the greatest effect on the body's heat production?

Skeletal

What type of muscle fibers has the longest endurance?

Slow

Which of these statements about skeletal muscles is FALSE?

Their fibers branch

The soleus muscle is very red in color. Which of these statements about soleus fibers is false?

They are large in diameter

The muscle action potential penetrates deep into a fiber along the

Transverse tubules

Smooth muscle contracts when calcium binds to __________ and activates __________

calmodulin; myosin light chain kinase

The capillaries that wrap around each muscle fiber are located within the

endomysium