Question 1

Which of the following best describes the 'origin' of a skeletal muscle?

Accepted Answer

The attachment of the muscle to the bone that remains stationary during contraction.

Question 2

A muscle named 'biceps brachii' is classified based on which characteristic?

Accepted Answer

The number of origins it has.

Question 3

Which structure attaches muscle to bone and is composed of dense regular connective tissue?

Accepted Answer

Tendon

Question 4

During a muscle contraction, which ion acts as the 'on-off switch' allowing myosin to bind to actin?

Accepted Answer

Calcium (Ca	extsuperscript{2+})

Question 5

Which phase of a muscle twitch is characterized by a delay between the stimulus and the onset of contraction?

Accepted Answer

Latent period

Question 6

If a muscle is named 'deltoid,' what does this indicate about its shape?

Accepted Answer

It is triangular.

Question 7

Which of the following best explains the 'size principle' in muscle contraction?

Accepted Answer

As greater force is required, the nervous system recruits larger motor units with more fibers.

Question 8

A muscle named 'sternocleidomastoid' is named for which feature?

Accepted Answer

Its origin and insertion

Question 9

Which of the following is TRUE regarding muscle tone?

Accepted Answer

Muscle tone involves small contractions that keep muscles firm without shortening.

Question 10

Which of the following is a correct example of a muscle named for its action?

Accepted Answer

Flexor carpi radialis

Question 11

A patient suffers a nerve injury that prevents stimulation of motor units in the quadriceps. What is the most likely consequence?

Accepted Answer

The quadriceps will be unable to contract, leading to loss of knee extension.

Question 12

Which of the following best describes an aponeurosis?

Accepted Answer

A sheet of dense regular connective tissue connecting muscles to other structures.

Question 13

Which muscle would most likely be involved in abduction of the thigh?

Accepted Answer

Abductor magnus

Question 14

What is the primary function of blood vessels branching profusely within a muscle?

Accepted Answer

To provide each muscle fiber with a direct blood supply.

Question 15

Which of the following is NOT a criterion used in naming skeletal muscles?

Accepted Answer

Color of the muscle

Question 16

A muscle twitch recorded on a myogram shows a period of contraction followed by relaxation. What does the relaxation phase represent?

Accepted Answer

Lengthening of the muscle fibers

Question 17

Which of the following best explains graded muscle response?

Accepted Answer

The force of muscle contraction varies by changing the number of motor units contracting and/or the frequency of stimulation.

Question 18

If the frequency of nerve stimulation to a muscle increases, what is the expected effect on muscle contraction?

Accepted Answer

The force of contraction will increase due to summation.

Question 19

Which of the following muscles is named for its fiber direction?

Accepted Answer

Rectus abdominis

Question 20

A muscle named 'trapezius' is classified based on which characteristic?

Accepted Answer

Its shape

Study Notes: The Muscular System (Anatomy & Physiology)

Guida di studio - Domande di pratica