Question 1

Which type of muscle tissue is shown in the first image (top left), characterized by long, cylindrical, multinucleated cells with visible striations?

Accepted Answer

Skeletal muscle

Question 2

The second image shows muscle tissue with spindle-shaped cells and no visible striations. Which muscle type is this, and where is it most commonly found?

Accepted Answer

Smooth muscle; walls of internal organs

Question 3

The third image displays muscle tissue with striations and branching fibers. Which muscle type is this, and what is a unique feature of its cellular junctions?

Accepted Answer

Cardiac muscle; intercalated discs with gap junctions

Question 4

Referencing the fourth image, which best describes a motor unit?

Accepted Answer

A motor neuron and all the muscle fibers it innervates

Question 5

Based on the fifth image, which illustrates the sliding filament theory, what happens to the sarcomere during muscle contraction?

Accepted Answer

The Z discs move closer together as actin and myosin slide past each other

Question 6

The sixth image shows the biceps and triceps. During elbow flexion, which muscle acts as the antagonist?

Accepted Answer

Triceps brachii

Question 7

In the seventh and eighth images, what is the functional significance of the Z disc in a sarcomere?

Accepted Answer

It anchors thin filaments and defines the boundary of a sarcomere

Question 8

The ninth image shows a muscle tissue with striations and multiple nuclei per cell. Which property is unique to this tissue compared to the other two muscle types?

Accepted Answer

Voluntary control

Question 9

The tenth image is of a human heart. Which muscle type is found here, and what is a key functional property?

Accepted Answer

Cardiac muscle; inherent rhythmicity (automaticity)

Question 10

The eleventh image shows the wall of the digestive tract. Which muscle type is responsible for peristalsis in this organ?

Accepted Answer

Smooth muscle

Question 11

Which connective tissue layer surrounds an individual muscle fiber, as seen in the cross-sectional muscle images?

Accepted Answer

Endomysium

Question 12

Which protein is responsible for the elasticity of muscle, allowing it to return to its original length after being stretched?

Accepted Answer

Titin

Question 13

Which of the following best describes the arrangement of fascicles in a pennate muscle, as seen in the muscle arrangement images?

Accepted Answer

Fascicles attach obliquely to a central tendon

Question 14

Which muscle type is capable of the greatest degree of shortening, based on fascicle arrangement?

Accepted Answer

Parallel

Question 15

Which structure is continuous with tendons and surrounds the entire muscle, as shown in the muscle cross-section images?

Accepted Answer

Epimysium

Question 16

Which of the following is NOT a function of muscle tissue?

Accepted Answer

Secreting hormones

Question 17

Which property of muscle tissue allows it to respond to a stimulus from the nervous system?

Accepted Answer

Excitability

Question 18

During muscle contraction, which band remains the same length, as shown in the sarcomere diagrams?

Accepted Answer

A band

Question 19

Which type of muscle tissue is capable of regeneration and is found in the walls of hollow organs?

Accepted Answer

Smooth muscle

Question 20

Which of the following best describes the role of a fixator muscle during movement?

Accepted Answer

It stabilizes a bone to allow the prime mover to act more efficiently

Muscle Tissue: Structure, Function, and Organization

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