Exam 17: Muscle Contraction

The cell membrane of a muscle fiber is called the sarcolemma.

Which of the following is not one of the major functions of muscles?

The graded strength principle states that:

A motor neuron plus the muscle fibers to which it attaches is called a motor unit.

The smallest contractile unit of muscle is a:

A triad consists of a T-tubule sandwiched between sacs of the sarcoplasmic reticulum.

List three conditions that influence the strength of muscle contraction.

The longer the initial length of a muscle, the stronger the contraction of that muscle can be.

Myofibrils contain several sarcomeres lined up end to end.

As resistance increases, the number of motor units needed to overcome that resistance has to increase.

The neurotransmitter(s) secreted at the motor end plates of skeletal muscles is(are):

Multiunit smooth muscle is more common in the body than single-unit smooth muscle.

Which type of muscle is responsible for peristalsis?

Skeletal muscle has a great ability to stretch.

In the "warmed up" muscle, the calcium ions are able to be completely returned to the sarcoplasmic reticulum.

Match each term with its corresponding definition or description. -Name given to the plasma membrane of a muscle cell

Match each term with its corresponding definition or description. -A neuron and all the muscle fibers it stimulates

When troponin and calcium combine, it causes actin to shift and allows the myosin to form cross-bridges.

The H-zone in a relaxed sarcomere is composed of only myosin.

Match each term with its corresponding definition or description. -The ability of a muscle cell to shorten