Practice Exam (Ch 9, 10)

Which of the following is a muscle of mastication?

During the depolarizing of an action potential the current flow is dominated by

Guerrera noticed a sagging skin in the front of her neck. What muscle is in this area?

The hamstrings are the ______

Which of the following muscles is NOT a spinal flexor?

Pushing against a locked door is an example of __________

Which of the following is NOT an effect of aging on the muscular system?

The biceps brachii muscle is an example of which type of fascicle arrangement?

The rectus abdominis muscle is _____

A muscle performing the same function as another muscle is called _____

Haley raises her head to look at a study partner across the table from her. This action is using which lever system?

The all or nothing principle of nerve action states that

The cycle of a mysosin binding to actin, then releasing and returning to its original position is called

The command to contract is conducted throughout the muscle fiber by the

Which of the following is not a function of the myosin heads?

In _____, muscle fibers partially relax between contractions, and in ____, no relaxation occurs between contractions

Thin myofilaments are called ____ and thick myofilaments are called ______

What is the functional unit of the muscle fiber

Skeletal muscle functions in __________.

Which of the following statements about the sartorius muscle is FALSE?

The actions of the gluteus medius and gluteus minimus muscles include which of the following?

Each presynaptic terminal contains ___________, which contain the neurotransmitter __________

The orbicularis oris is an example of which type of muscle fiber arrangement?

The rotator cuff is composed of the __________.

Levers can change the ______

_____ occurs when a rested muscle is stimulated repeatedly, with each contraction stronger than the previous.

The superficial extensors include the ______

What is the membranous network that surrounds each myofibril?

The constant tension produced by muscles for long periods of time is ______

What is the smallest component of a skeletal muscle?

What is an antagonist?

A single motor neuron and the muscle fibers that it innervates is called a _____

Which of the following does NOT happen when the action potential reaches the synaptic terminal?

For tropomyosin to be shifted off its position covering the active sites of actin molecules, calcium ions must bind to

Z-lines ______

Which of the following represents the correct sequence of events in a contraction cycle?

The charge across the plasma membrane of an unstimulated cell is called the

Movement of the myosin head while connected to actin is ____, and the return of the myosin head to original position is

The point where the axon terminal synapses with the muscle fiber sarcolemma is called the _____

Which of the following muscles is NOT part of the rotator cuff?

When potassium begins to flow out of the cells that is an indication of

The typical resting potential for a neuron is

Hypertrophy means that there is a(n) ____ in the size of the muscle fiber, and there is usually ___ muscle fibers

What are the primary extensors of the elbow?

What happens when the action potential reaches its peak?